... Accession Number : AD0288016. Title : ABSOLUTE LUMINOSITY, SIZE, AND VELOCITY OF INDIVIDUAL LABORATORY MICROMETEORS. ...

The BEPCII Luminosity Monitor (BLM) monitors relative luminosity per bunch. The counting rates of gamma photons, which are proportional to the luminosities from the BLM at the center of mass system energy of the ? (3770) resonance, are obtained with a statistical error of 0.01% and a systematic ...

An essential ingredient in all cross section measurements is the luminosity used to normalize the data sample. In this note, we present the final assessment of the integrated luminosity recorded by the D0 experiment during Tevatron Run IIa. The luminosity measurement is derived from hit rates from the products of inelastic ...

Characteristics and performance of the Kaon Monitor of the DEAR experiment at the /DA?NE collider of Laboratori Nazionali di Frascati are described. The full TDC and ADC information collected from the detectors of the setup allows a clean observation of the charged kaon pairs from /?-decay by means of their different arrival times with respect to the background particles. The ...

A program to monitor solar luminosity variations through diameter measurements has been in operation at SCLERA since 1981. The solar diameter is measured at multiple angles from the equator. Measurements at these different angles have the advantage that not only can the solar oblateness be accurately measured, but also, a systematic errors introduced by ...

Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at sqrt{s} = 7 TeV are presented. The luminosity is independently determined using several detectors and multiple algorithms, each having different acceptances, systematic uncertainties and sensitivity to background. The ratios of the ...

The luminosity monitor system utilized by the MKII Detector and by the PEP operators is described. This system processes information from 56 photomultipliers and calculates independent luminosities for each of the 3 colliding bunches in PEP. Design considerations, measurement techniques, and sources of error in the ...

The relation between absolute optical luminosity and optical variability is examined for quasars. Broad categories of quasar theories lead to different expectations for this relation. The available data do not support any of the simple theories. Additional observations are suggested that would permit more restrictive theoretical inferences. ...

Methods to perform the absolute energy calibration of DELPHI's Small Angle Tagger luminosity calorimeters at LEP are presented and compared. The input was small angle Bhabha scattering events. A significant non-linearity in the response of the calorimeter...

Page 1. Structural Health Monitoring of Strategically Tuned Absolutely Resilient Structures (STARS) Stephen A. Marotta ...

AESSIM, the Absolute, Extreme-Ultraviolet, Solar Spectral Irradiance Monitor, is designed to measure

A program to monitor solar luminosity variations through diameter measurements has been operation at SCLERA since 1981. The solar diameter is currently measured at multiple angles from the equator. Measurements at these different angles have the advantage that, not only can the solar oblateness be accurately measured, but, also, systematic errors, ...

The PEP II fast luminosity system provides a measurement of luminosity to the control system with a time constant of 0.3 seconds and fluctuations less than 0.1% for this interval, adequate for use in feedback systems. Continuous visual updates of luminosity are provided. The alignment of the positron beam at the collision point can ...

The HELIOS device at Argonne National Laboratory provides a means of analyzing outgoing ions produced in direct reactions in inverse kinematics, with good energy resolution. To best exploit this device it is imperative that there is a means to measure absolute cross sections: ingredients essential, for instance, to the extraction of spectroscopic factors. A method has been ...

Using the properties of RR Lyrae stars we have calibrated the Galactic Globular Cluster Luminosity Function (GCLF) and tested the constancy of itspeak absolute magnitude M_V(TO).

Recently DuPuy suggested that RV Tauri variables show evidence for approx.1.5 mag of nearly neutral extinction in the visual region. The suggestion is based upon an apparent discrepancy between photometric absolute magnitudes and spectroscopic luminosity classes. We have reexamined the evidence and conclude that no discrepancy exists if the ...

... Individual absolute magnitudes are available for only 2 Mira variables (X Oph and X Mon) in the northern sky, but the agreement of their values with ...

The ATLAS collaboration will determine the absolute luminosity of the CERN LHC at Interaction Point 1 by measuring the trajectory of protons elastically scattered at very small angles (?rad). A scintillating fibre tracker system called ALFA (Absolute Luminosity For ATLAS) is proposed for this measurement. Detector ...

... Title : Absolute, Extreme Ultraviolet Solar Spectral Irradiance Monitor (AESSIM). ... film filters to make absolute measurements of EUV radiation over a ...

The luminosity of the Tevatron collider was calculated. The data used for the calculation are the flying wire transverse beam profile and the SBD bunch profile. For the 900 GeV/c mini beta runs, the calculation was compared to the CDF luminosity monitor. ...

The feasibility of a luminosity monitor based on a radiative Bhabha detector is investigated n the context of the TESLA linear collider. Another option based on low energy e(sup +)e(sup -) pair calorimetry is also discussed. In order to monitor the beam p...

The start of the Large Hadron Collider (LHC) is scheduled for the Summer 2008. The accelerator is going to provide unprecedented amount of proton-proton colli- sions with a record center-of-mass energy. The total number of collisions produced in an interaction point is directly connected to a collider characteristic called `absolute luminosity'. The ...

... Electron Impact Ionization I April 1994 ... Quantitative Monitoring of Ammonia and Hydrazines: Absolute Cross Sections for Electron Impact Ionization ...

The luminosity system is an integral part of the D0 detector that must be properly maintained to provide accurate luminosity measurements for physics analysis. After the addition of a readout layer to the silicon vertex detector in 2006, it was necessary to re-calculate the effective inelastic cross section to which the luminosity ...

This is a note to define topics to be studied in more depth for the Luminosity monitoring for Spin Asymmetries. My numerical examples here are to stimulate discussion and should be taken with a grain of salt. The RHIC Spin experiments will require a very ...

Photometric data for nearly 250 quasars, BL Lacertids, and active galaxies have been obtained at the Rosemary Hill Observatory during a continuous 13-year monitoring program. Long-term optical records for 130 of these sources are employed in an effort to assess the physical and cosmological properties of quasi-stellar objects. Photographic P and B magnitudes were obtained with ...

The RHIC proton polarimeters can operate in scanning mode, giving polarization profiles and transverse beam intensity profile (beam emittance) measurements. The polarimeters function as wire scanners, providing a very good signal/noise ratio and high counting rate. This allows accurate bunch-by-bunch emittance measurements during fast target sweeps (<1 s) through the beam. Very thin carbon ...

LUCID (LUminosity measurement using Cherenkov Integrating Detector) is a Cherenkov counter designed to monitor the luminosity in the ATLAS experiment. Since the final accuracy of the measurement of some crucial physical quantities in the LHC program will depend on the precision of the luminosity measurement, it is ...

We have started a VLBI monitoring program for Asymptotic Giant Branch (AGB) stars at 22 and 43 GHz as part of a project of the VLBI Exploration of Radio Astrometry (VERA) for precisely obtaining the period-luminosity (PL) relation of Galactic Mira variables. Using accurate distances measured with VERA, we reveal PL relation in the Galaxy based on the ...

We constructed a luminosity monitor of the lead-scintillator sandwich type for the VENUS detector at the e+e- collider TRISTAN. Photomultiplier tubes with transmissive mesh dynodes could be operated fairly well in a high magnetic field and hence the readout optics system was considerably simplified. We present the performance of the ...

Luminosity measurements at the high luminosity points of the LHC are very challenging due to the extremely high radiation levels in the order of 180 MGy/yr. They have designed an ionization chamber that uses a flowing inorganic gas mixture and a combination of metals and ceramics. With such a choice, an additional challenge is achieving the necessary speed ...

The ATLAS collaboration plans to determine the absolute luminosity of the CERN LHC at Interaction Point 1 by measuring the trajectory of protons elastically scattered at very small angles (?rad). A scintillating fibre tracker system called ALFA (Absolute Luminosity For ATLAS) is proposed for this measurement. ...

At each LEP interaction point, the luminosity is monitored on-line by small angle Bhabha detectors. These detectors are optimized to observe in all bunches relative luminosity changes in a few seconds. The description of the detectors is given, together with the method used to calculate the luminosity after ...

The D0 experiment calculates its luminosity using the visible cross section (luminosity monitor constant) (sigma)(sub L0) for its Level 0 trigger based on the world average (anti p)p inelastic cross sections at (radical)s - 1.8 TeV. For the 1992-1993 Teva...

The D0 experiment has previously calculated its luminosities using a visible cross section (luminosity monitor constant) for its Level 0 trigger, (sigma)(sub L0) = 42.9 mb based on the E710 inelastic cross section measurements. Recently, CDF has also publ...

LUCID is the luminosity monitor of the LHC accelerator for the ATLAS experiment. Thanks to an intrinsically fast response and to its custom readout electronics, LUCID estimates the number of interactions per LHC bunch crossing and provides an interaction trigger to the experiment. The performance of LUCID is evaluated in the full ...

... Accession Number : ADA279345. Title : Absolute, Extreme-Ultraviolet Solar Spectral Irradiance Monitor (AESSIM). Descriptive ...

Focus is given to possible variations in solar luminosity and accurate methods of monitoring it. Aside from direct bolometry, one methodology for this type of research makes use of measurements of the solar diameter and limb darkening function as indirect indicators of the solar luminosity. This approach was reviewed.

A novel segmented, multi-gap, pressurized gas ionization chamber is being developed for optimization of the luminosity of the LHC. The ionization chambers are to be installed in the front quadrupole and zero degree neutral particle absorbers in the high l...

At Fermi National Accelerator Laboratory (Fermilab), the Tevatron high energy particle collider must meet the increasing scientific demand of higher beam luminosity. To achieve this higher luminosity goal, U.S. Department of Energy (DOE) sponsored a major...

Small angle Bhabha scattering (e{sup +}e{sup -} {yields} e{sup +}e{sup -}) is used to measure the luminosity for the 1993 run of the SLD experiment. SLD operates at the Stanford Linear Collider at Stanford Linear Accelerator Center where electrons and positrons are collided at center of mass energy on the Z{sup 0} resonance. A silicon tungsten luminosity ...

... million in cooperative agreements will be awarded for earthquake monitoring by the U.S Geological Survey in ... of the USGS Advanced National Seismic System (ANSS). �Earthquake monitoring is absolutely cr...

We study the relation between the mass accretion rate, the jet power, and the black hole mass of blazars. To this aim, we make use of the Sloan Digital Sky Survey (SDSS) and the 11 months catalog of blazars detected at energies larger than 100 MeV by the Large Area Telescope (LAT) onboard the Fermi satellite. This allows to construct a relatively large sample of blazars with information about the ...

The Luminosity Monitor for the LHC has been built at LBNL and will be operational in the LHC during the upcoming run. The device, a gas ionization chamber, is installed in the high luminosity regions (those dedicated to the ATLAS and CMS experiments) and capable to resolve bunch-by-bunch luminosity as well as ...

The authors determine the effective inelastic p{bar p} cross-section into the D0 Luminosity Monitor for all run periods prior to September 2004. This number is used to relate the measured inelastic collision rate to the delivered luminosity. The key ingredients are the inelastic p{bar p} cross-section, the ...

Astronomy notes is an educational resource for introductory astronomy classes for undergraduates. This section discusses the properties of stars. such as apparent magnitude, absolute magnitude, luminosity, color, temperature, stellar velocities, compositions, and sizes. Other topics included are descriptions of parallax, redshift, blueshift, center of ...

From an analysis of the Baldwin effect in five complete optically selected samples of quasars, it was found that the slope of the correlation between equivalent width and absolute luminosity is very shallow. In particular, it was found that EW(sub CIV) is...

The D0 experiment calculates its luminosity using the visible cross section (luminosity monitor constant) {sigma}{sub L0} for its Level 0 trigger based on the world average {anti p}p inelastic cross sections at {radical}s - 1.8 TeV. For the 1992-1993 Tevatron Run (1A), the luminosity monitor ...

The D0 experiment has previously calculated its luminosity using the visible cross section (luminosity monitor constant) for its Level 0 trigger, {sigma}{sub L0} = 48.2 mb, based on the world average {ovr p}p inelastic cross sections at {radical}s = 1.8 TeV. The error on luminosity had been set at 12%. Recent ...

The STAR experiment at RHIC serves as an excellent laboratory for studying spin in QCD. Comparing predicted and measured cross sections requires accurate measurements of the luminosity. At RHIC, the absolute luminosity of colliding beams is determined through a vernier scan, where trigger rates at STAR are recorded as a function of the ...

The paper investigates the controversial relation between the continuum luminosity and the C IV 1550 emission-line strength in the spectra of quasars, commonly referred to as the Baldwin effect, as a possible indicator of absolute luminosity. It is concluded that the Baldwin effect does represent a physical correlation between the ...

We analyse the results of a 5.5-yr photometric campaign that monitored 247 southern, semiregular variables with relatively precise Hipparcos parallaxes to demonstrate an unambiguous detection of red giant branch (RGB) pulsations in the solar neighbourhood. We show that Sequence A' contains a mixture of asymptotic giant branch and RGB stars, as indicated by a ...

The luminosity at the four interaction points of the Large Hadron Collider (LHC) must be continuously monitored in order to provide an adequate tool for the control and optimisation of beam parameters. Polycrystalline cadmium telluride (CdTe) detectors have previously been tested, showing their high potential to fulfil the requirements of ...

We present the analysis of the properties of water maser emission in 14 star forming regions (SFRs), which have been monitored for up to 13 years with a sampling rate of about once every 2-3 months. The 14 regions were chosen to span a range in luminosity Lfir of the associated Young Stellar Object (YSO) between 20 Lsun and 1.8 x 106 Lsun. The general ...

The luminosity of the Tevatron collider was calculated. The data used for the calculation are the flying wire transverse beam profile and the SBD bunch profile. For the 900 GeV/c mini beta runs, the calculation was compared to the CDF luminosity monitor. The ratio of the calculation and C:BOLUMP is 0.95. 1 ref., 9 figs., 4 tabs.

A device is designed to detect bremsstrahlung at wide angles and wavelengths near the visible. A schematic diagram of the monitor is shown. An analysis of the performance of the monitor is given in terms of photomultiplier output and luminosity. 3 refs., 1 fig. (DWL)

The OLYMPUS experiment at DESY has been proposed to measure the ratio of positron-proton and electron-proton elastic scattering cross sections to quantify the effect of two-photon exchange, which is widely considered to be responsible for the discrepancy between measurements of the proton electric to magnetic form factor ratio with the Rosenbluth and polarization transfer methods. In order to ...

Luminosity monitors are needed in each experiment doing spin physics at RHIC. They concentrate on the luminosity aspects here because, for example, with a 10{sup {minus}3} raw asymmetry in an experiment, an error of 10{sup {minus}4} in the luminosity is as significant as a 10% polarization error. Because ...

The possibility of deep parametric decay instability suppression by launching a complementary (small power) pump wave possessing a slightly shifted frequency is demonstrated experimentally. This suppression is achieved at an additional pump wave frequency shift equal to the frequency separation of ion acoustic eigenmodes excited in plasma as a result of absolute parametric ...

... Descriptors : *Indicator lights, Subminiature electrical equipment, Lamps, Consoles, Monitors, Maintenance equipment, Life tests, Luminosity, Air ...

Over 5 years of daily hard X-ray (>20 keV) monitoring of the 2 minute accretion-powered pulsar GX

Dec 1, 1981 ... Focus is given to possible variations in solar luminosity and accurate methods of monitoring it.

This is a note to define topics to be studied in more depth for the Luminosity monitoring for Spin Asymmetries. My numerical examples here are to stimulate discussion and should be taken with a grain of salt. The RHIC Spin experiments will require a very high degree of coordination between the experiments and the accelerator. For example see AGS/RHIC/SN ...

... detect, classify, locate, track and monitor marine mammals in their ... estimating absolute density or abundance of marine mammal populations using ...

5 days ago ... The Climate Absolute Radiance and Refractivity Observatory ... will monitor the pulse of the Earth to better understand climate change. ...

This is a report on W and Z candidate events seen in the data taken by CDF in the 1987 run at the Tevatron Collider at Fermilab. These results are preliminary in that acceptances have not been properly calculated and backgrounds have not been appropriately determined. Data corresponding to an integrated luminosity of 35 mg/sup -1/ were collected during the run. Peak ...

The Qweak experiment at Jefferson Lab is a precision measurement of the weak charge of the proton using parity-violating electron scattering. To make this measurement the experiment uses diagnostic detectors with small counting statistical errors that provide information about beam and target properties. The Qweak luminosity monitors were designed to ...

The PEP-II B-Factory is delivering peak luminosities of up to 9.2 {center_dot} 10{sup 33} 1/cm{sup 2} {center_dot} l/s. This is very impressive especially considering our poor understanding of the lattice, absolute orbit and beam position monitor system (BPM). A few simple MATLAB programs were written to get lattice information, like ...

Galaxies of all morphological classes in the Revised Shapley-Ames (RSA) catalog show the same type of correlation between absolute magnitude and redshift as was found for E and SO galaxies in Paper I of this series. Mean absolute magnitudes become brighter with increasing redshift due to the bias caused by a broad luminosity function ...

The 3-D luminosity distribution at the IP of the SLAC B-Factory is monitored using e{sup +}e{sup -} {yields} e{sup +}e{sup -}, {mu}{sup +}{mu}{sup -} events reconstructed online in the BABAR detector. The transverse centroid and spatial orientation of the luminosity ellipsoid reliably monitor IP orbit drifts. The ...

The LHC beam luminosity monitor is based on the following principle. The neutrals that originate in LHC at every PP interaction develop showers of minimum ionizing particles in the absorbers placed in front of the separation dipoles. The shower energy, me...

An overview is given of the analysis of more than a decade of H2O maser data from our monitoring program. We find the maser emission to generally depend on the luminosity of the YSO as well as on the geometry of the SFR. There appears to be a threshold luminosity of a few times 104L? above and below which we find different maser ...

The authors report the first studies of bunch length in collision in an operating linear collider, making use of a new rf bunch length monitor installed in the South Final Focus of the Stanford Linear Collider (SLC) prior to the 1997/98 luminosity run. The theoretical and measured monitor responses to linac injection phase and bunch ...

We present an expression for the rate of correlated Coulomb dissociation of both colliding nuclei at a heavy-ion collider. For the case of Au + Au at RHIC, the cross section for mutual correlated dissociation is about 3 barns. This process should be cleanly measured with very forward (zero degree) calorimeters proposed for RHIC. We also discuss prospects for luminosity ...

A record luminosity of 4.2 10{sup 31}has been reached at the Fermilab p-{bar p} collider. The lifetime of this luminosity at the beginning of the store is about 10 hours. This lifetime can be explained by the measured loss of anti-protons and protons due to collisions and emittance growths. We report on transverse emittance growth rates based on our ...

While the bunches in a linear collider cross once only, due to their small size they experience a strong beam-beam effect. Guinea-Pig is a code to simulate the impact of this effect on luminosity and background. A short overview of the program is given, with examples of its application to the background studies for TESLA, the top threshold scan and a possible ...

We describe upgrades to the readout system for the D0 Luminosity Monitor. The D0 Luminosity Monitor consists of plastic scintillation detectors with fine-mesh photomultiplier readout that cover the pseudorapidity range 2.7 < |{eta}| < 4.4. The detector is designed to provide a precise measurement of ...

An analysis of the first set of low-redshift (z < 0.08) Type Ia supernovae (SNe Ia) monitored by the Carnegie Supernova Project between 2004 and 2006 is presented. The data consist of well-sampled, high-precision optical (ugriBV) and near-infrared (NIR; YJHKs ) light curves in a well-understood photometric system. Methods are described for deriving light-curve parameters, ...

An analysis of the first set of low-redshift (z < 0.08) Type Ia supernovae (SNe Ia) monitored by the Carnegie Supernova Project between 2004 and 2006 is presented. The data consist of well-sampled, high-precision optical (ugriBV) and near-infrared (NIR; YJHK{sub s} ) light curves in a well-understood photometric system. Methods are described for deriving light-curve ...

Absolute cancer risk is the probability that an individual with given risk factors and a given age will develop cancer over a defined period of time. In collaboration with investigators in the NCI's Division of Cancer Epidemiology and Genetics (DCEG), staff of the Risk Factor Monitoring and Methods Branch (RFMMB) are developing statistical models to ...

Using X-ray monitoring observations with the All-Sky Monitor on board the Rossi X-Ray Timing Explorer and the Burst Alert Telescope on board the Swift, we are able to study the spectral state transitions occurred in about 20 bright persistent and transient black hole and neutron star binaries. We have confirmed that there is a correlation between the X-ray ...

We perform an exhaustive analysis of the luminosities of galaxies in groups identified in the Sloan Digital Sky Survey (SDSS) Data Release 7. Our main purpose is to perform a detailed study of the Schechter luminosity function parameters: the characteristic absolute magnitude and the faint-end slope, as a function of group virial mass ...

D0 has calculated the luminosity monitor constant for {radical}s= 630 GeV. The inelastic p{anti p} cross section was interpolated between measurements performed at {radical}s = 546 and 1800 GeV. The geometric acceptance, hardware efficiency, and luminosity-dependent corrections are similar to those previously published for the full ...

The D0 experiment has previously calculated its luminosities using a visible cross section (luminosity monitor constant) for its Level 0 trigger, {sigma}{sub L0} = 42.9 mb based on the E710 inelastic cross section measurements. Recently, CDF has also published inelastic cross section measurements markedly different from E710. The D0 ...

In this study we numerically modelled the atmospheric ablation and luminosity of cometary structure meteoroids with geocentric velocities from 71 to 200 km/s. We considered meteoroid masses ranging from 10-13 to 10-6 kg. Expected heights of ablation and maximum luminosity absolute magnitudes are determined. Height and trail length ...

Stromgren uvby photometric observations of 10 eclipsing binaries thought to contain undersize subgiant secondaries are presented and analyzed. A straightfortward analysis of the data indicates that the primaries are 1 to 2 magnitudes brighter than luminosity class V stars and that they do not obey the normal main-sequence mass -luminosity law. ...

The contribution of UV spectroscopy to the understanding of massive X-ray binaries, is reviewed. Results are given in the context of normal stars and binaries. The IUE results have enabled a greater understanding of the effects of accretion disks and X-ray heating in the systems, and provide absolute fluxes and luminosities. High-dispersion data reveal the ...

A detailed model for the infrared point source sky is presented that comprises geometrically and physically realistic representations of the galactic disk, bulge, spheroid, spiral arms, molecular ring, and absolute magnitudes. The model was guided by a parallel Monte Carlo simulation of the Galaxy. The content of the galactic source table constitutes an excellent match to the ...

We have monitored the phase of the main X-ray pulse of the Crab pulsar with the Rossi X-ray Timing Explorer (RXTE) for almost eight years, since the start of the mission in January 1996. The absolute time of RXTE's clock is sufficiently accurate to allow ...

The determination of absolute neutron fluxes by white beam activation of thick gold foils in conjunction with spectral analysis by time-of-flight monitors is described. A numerical integration procedure is presented and the method applied to determining t...

During the 1997/98 luminosity run of the Stanford Linear Collider (SLC) two novel RF-based detectors were brought into operation, in order to monitor the interaction-point (IP) bunch lengths and fluctuations in the relative arrival time of the two colliding beams. Both bunch length and timing can strongly affect the SLC luminosity and ...

We present luminosity and surface-brightness distributions of 40111 galaxies with K-band photometry from the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS), Data Release 3 and optical photometry from Data Release 5 of the Sloan Digital Sky Survey (SDSS). Various features and limitations of the new UKIDSS data are examined, ...

We are reporting about a scintillating fibre tracking detector which is proposed for the precise determination of the absolute luminosity of the CERN LHC at interaction point 1 where the ATLAS experiment is located. The detector needs to track protons elastically scattered under $\\mu$rad angles in direct vicinity to the LHC beam. It is based on square ...

We are reporting about a scintillating fiber tracking detector which is proposed for a precise determination of the absolute luminosity of the CERN LHC at interaction point 1 where the ATLAS experiment is located. The detector needs to track protons elastically scattered under micro-radian angles in direct vicinity to the LHC beam. It is based on square ...

The physics reach of the SSC can eventually be extended considerably by an increase in luminosity. New heavy particles and other phenomena with robust signatures would be readily identified even in the presence of large numbers of simultaneous background interactions. As an example, this note examines the case in which the number of protons per SSC bunch is increased by a ...

S>Trigonometric parallaxes are shown to contribute sufficient infortmation to yield consistent luminosity calibrations for G8-K3 giants. Calibrations of the absolute visual magnitude, M/sub V,/ in terms of the narrow- band indices n, k, m. and f are obtained. The consistency only applies to luminosities derived from ...

The method of dispersion calculation employed in the reported investigation uses cross-correlation against a filtered template. It is a linear process that does not require nonlinear least-square parameter estimation. A description is given of tests which were performed to check the accuracy of the conducted measurements. Dispersion estimates are presented for 373 elliptical and S0 galaxies. ...

The galaxy G1200 - 2038 has an emission-line spectrum similar to that of a type 2 Seyfert galaxy. An analysis of the H-beta profile reveals the presence of a broad component with FWHM about 840 km/s. One curious feature of G1200 - 2038 is that, despite its relatively low velocity (cz = 6420), it appears almost stellar on the Palomar Sky Survey. Higher-quality CCD imaging indicates that the ...

Cepheids are a class of variable (pulsating) stars whose absolute luminosities are related in a simple manner to their pulsational periods. By measuring the period and using the 'period-luminosity' relationship, astronomers can use the observed visual brightness to determine the distance to the star. Because these stars are very ...

A detail classification of astronomical measurers is given with a specific retrospective view to Cepheid and their function of standard candle. The goal was determination of the relation of period of variability and absolute luminosity for the set of Galactic Cepheid. For that sake a new quasi-method is used and it is consisted of three steps: 1. the ...

NSLS booster diagnostics consisted of tune measurement system, system for turn-by-turn measurement on the electron beam, and beam intensity monitor, which is not absolutely calibrated. We present design and implementation of synchrotron light monitor for ...

The discovery of a new transient X-ray pulsar, EXO 2030+375, that is associated with a Be star companion, is reported. The results of a series of EXOSAT observations, where the evolution of the pulsar's properties over two orders of magnitude in luminosity was monitored. The dependence of the change in pulsar period on ...

To achieve maximum integrated luminosity at the SLAC Linear Collider, a method of noninvasive beam tuning is required. Traditional luminosity monitors based on Bhabha scattering are inadequate because of low instantaneous counting rates. Coherent deflections of one beam by the electromagnetic field of the other are sensitive not only ...

We report the result of evaluating radiation damage to Bicron BC408 plastic scintillator used in the D0 Luminosity Monitor during Run IIa. The Luminosity Monitor provides pseudo-rapidity coverage over the range 2.7 < |{eta}| < 4.4, with the radiation dose in Run IIa estimated to be 0.5 MRad for the ...

Previously, the generalized luminosity L was defined and calculated for all incident channels based on an NLC e (sup +)e(sup -) design. Alternatives were then considered to improve the differing beam-beam e(sup -)e(sup -) e (gamma) and (gamma) (gamma) cha...

... Abstract : Objectives are to verify the innovative concepts of non-invasive intracranial pressure (ICP) absolute value measurement and non-invasive ...

... 1997 at both creeks. Table C3-1. Estimated correlations among absolute thalweg residual deviations from the median ... apart.

... for in-orbit calibration of a solar spectral irradiance monitor. ... Descriptors : *ULTRAVIOLET RADIATION, *SOLAR RADIATION, ORBITS, THIN FILMS ...

There exists a growing need to improve the accuracy of measurement of the absolute solar flux within

We use the Herschel-Astrophysical Terahertz Large Area Survey (ATLAS) science demonstration data to investigate the star formation properties of radio-selected galaxies in the GAMA-9h field as a function of radio luminosity and redshift. Radio selection at the lowest radio luminosities, as expected, selects mostly starburst galaxies. At higher radio ...

By scanning gated cameras and gated tune monitors across the bunch pattern during normal colliding-bunch operation of PEP-II, the tunes and beam sizes of individual bunches were measured simultaneously in the high and low energy storage rings of PEP-II. The measurements were made with 1561 colliding bunches in PEP-II, arranged in trains of 66 bunches, with each bunch in the ...

For true head-on collisions, measuring luminosity appears to be straightforward. Small crossing angles, even if they work, complicate the situation very much--especially if one wishes to know the luminosity better than 10 percent. However, except for the possible necessity of some extra trim magnets, it is hard to see how these considerations can affect ...

The goal of the RHIC 2004 Au-Au run was to maximize the achieved integrated luminosity. One way is to increase beam currents and minimize beam transverse emittances. Another important ingredient is the minimization of time spent on activities postponing the declaration of ''physics conditions'', i.e. stable beam conditions allowing the ...

A novel, segmented, multi-gap, pressurized gas ionization chamber is being developed for optimization of the luminosity of the LHC. The ionization chambers are to be installed in the front quadrupole and zero degree neutral particle absorbers in the high luminosity IRs and sample the energy deposited near the maxima of the hadronic/electromagnetic showers ...

Three-color photoelectric observations of the variable W CVn obtained were interpreted. The investigation shows secular change of the period and a stable light curve. Interstellar absorption in the direction of the variable is discussed and the absolute magnitude from the period--luminosity relation was derived. Color--color diagram was constructed and a ...

A high luminosity e+e{minus} collider is proposed to explore decays of charmed mesons, {tau} leptons, and charmonia. Extremely large event samples will give precision measurements of the absolute branching fraction and structure of hadronic, semileptonic, and leptonic charmed meson decay. Tau pair events will be used to study the properties of {tau} decay, ...

120 mA resolution spectra of the cores and wings of the Ca II H and K lines in 43 stars covering a wide range of spectral type and luminosity class are presented. Chromospheric radiative loss rates in the H and K lines are derived, and trends in these los...

'Ultraviolet' stars are defined as those whose continuous spectra are quite strong in the wavelength region down to at least 2500 A. Spectrograms of two such stars, obtained aboard the Orion 2 space observatory, are analyzed. Both are shown to be fainter than 10th magnitude. It is found that the energy distribution in their spectra corresponds to temperatures in excess of 20,000 K. However, an ...

Optical spectroscopy and photometry of the Type Ia supernova SN 1988G obtained shortly after dicovery are presented. The redshift of the parent galaxy is determined to be 7055 km/sec. Adopting a distance of 88 Mpc, the supernova has an absolute magnitude of M(B) = -18.8. Based on the luminosity and the characteristics displayed by the optical spectrum it ...

The ALFA detector in ATLAS aims at measuring the absolute luminosity and the total cross-section with 2-3% accuracy. Its uses elastically scattered protons whose impact position on a fiber detector, located 240 m away from the interaction point, allow a measurement of the scattering angle.

This paper is intended as a general introduction to the session on transient cosmic x- and gamma-ray sources--gamma bursts. Temporal properties will be discussed first, including duration, fluctuation, and frequencies. Energy fluxes and spectral properties are then described together. Finally, the directional data are used to provide estimates of the distance to the sources and the ...

We present an optical and near-infrared survey of galaxies in nearby clusters aimed at determining fundamental quantities of galaxies, such as multivariate luminosity function and color distribution for each Hubble type. The main characteristics of our survey are completeness in absolute magnitude, wide wavelength coverage and faint limiting magnitudes.

The photometric observations during 1953-1994 were used for the construction of the summary light curve for 32 Cygni in the photometric UBV-system. On the basis of energy distribution data, the spectral classes and luminosities of the components of this binary system were obtained. The column density of HI during several ingresses and egresses was estimated, suggesting that ...

A number of areas of current research interest require measurements of solar irradiance made with greater absolute accuracy than is currently being achieved at various monitoring sites. By using currently available instrumentation and careful measuring techniques it is shown that it is possible to measure the solar irradiance with considerable precision on ...

In regular top-up-and-coast operation, PEP-II average luminosity is about 70-75% of the peak luminosity due to detector ramp-down and ramp-up times plus the time it takes to top-up both beams. We recently commissioned a new operational mode where the Low Energy Ring is injected continuously without ramping down the detector. The benefits--increased ...

A new cosmological test is derived, based on the distribution of individual V/V_max_ in a complete redshift-limited sample of distant objects. The fundamental assumption is that, in any range of absolute luminosity, individual V/V_max_ are required to be uniformly spread over the [0,1] range. Under the assumption of Pure Luminosity ...

We apply order statistics (OS) to the bright end (Mr < -22) of the luminosity distribution of early-type galaxies spectroscopically identified in the SDSS DR7 catalogue. We show that an overall normalized luminosity function can be derived from the data that describes the distribution of red elliptical galaxies sufficiently for the purposes of OS in a ...

We present the fifteenth list of faint late M and Carbon type stars detected on the Digitized First Byurakan Survey (DFBS) spectral plates in the zone with +45�<=?<=+49� covering 678.4�2^. Accurate DSS2 positions, USNO-B1.0 B, R, and I magnitudes, 2MASS near-infrared J, H, and Ks photometry, IRAS PSC/FSC fluxes (when available), approximate spectral types and ...

In 1968-2005 different observers (mainly, one of the authors�V.M. Lyuty) performed numerous measurements of luminosity of the nucleus of the Seyfert galaxy NGC 4151. It is shown that ( a) luminosity of the object pulsated over 38 years with a period of 160.0106(7) min coinciding, within the error limits, with the well-known period P 0 = 160.0101(2) min ...

Context: Rare types of variable stars may provide unique insight into short-lived stages of stellar evolution. The systematic monitoring of millions of stars and advanced light curve analysis techniques of microlensing surveys make them ideal for discovering such rare variable stars. One example is the R Coronae Borealis (RCB) stars, a rare type of evolved carbon-rich ...

Due to the inconsistency in the results of the mupGEp/GMp ratio of the proton, as extracted from the Rosenbluth and recoil polarization techniques, high precision measurements of the e-p elastic scattering cross sections were made at Q{sup 2} = 2.64, 3.20, and 4.10 GeV{sup 2}. Protons were detected, in contrast to previous measurements where the scattered electrons were detected, which ...

We report on new charge calibrations and linearity tests with high-dynamic range for eight different scintillating screens typically used for the detection of relativistic electrons from laser-plasma based acceleration schemes. The absolute charge calibration was done with picosecond electron bunches at the ELBE linear accelerator in Dresden. The lower detection limit in our ...

Recent satellite observations of the solar total irradiance confirm that it is varying at least on the 11 year time scale. Both blocking by sunspots and re-emission by faculae are components in this variation, but changes in the temperature of the solar p...

Contents: The production of charged scalar bosons at the HERA-collider; The process e(-) p->(gamma) e(-) p as a fast luminosity monitor for the HERA-collider; QED-radiative corrections to the process e(-) p->(gamma) e(-) p; Concise expressions for traces ...

A discussion is given of the anticipated operating conditions at the ISABELLE storage rings. Communications between experimental and control areas are considered, and beam luminosity monitoring is discussed. Running conditions and expected problems are outlined. (PMA)

The present program to study for the first time solar-like cycles in the X-ray emission of stars similar to our Sun has been ongoing since XMM s AO-1. Five targets in three stellar systems have been monitored since 2001, providing for the first time clear evidence of long-term cycles in the X-ray luminosity of normal stars, with variations in X-ray ...

I ASK your permission to reply to the arguments brought forward by Prof. Milne (NATURE, Mar. 22) against my treatment of the problem of stellar luminosity. The outcome of my investigation is a formula which predicts the luminosity of a star of given mass and radius (or mass and effective temperature). I have followed the common procedure of first employing ...

The distances and kinematics of brown dwarfs provide key statistical constraints on their ages, moving group membership, absolute brightnesses, evolutionary trends, and multiplicity. Yet fundamental measurements of parallax, proper motion and radial velocity have been made for only a relatively small fraction of the known brown dwarf population. To address this deficiency, we ...

We have carried out a near-infrared search for companions around 23 very low luminosity young stellar objects (YSOs) in the Taurus molecular cloud. After sophisticated photometry and analysis, five extremely low luminosity YSO (ELL-YSO) candidate companions were identified by both their near-infrared colors and proximity to the primary (separation less ...

Determination of the offset of the electrical center of the beam position monitor (BPM) relative to the mechanical center is required for the absolute beam position measurement in the injector synchrotron and the storage ring of the APS. Conventionally, R...

The goal of this program was to design, build, test, and characterize a flight qualified calibration source and monitor for a Dark Energy related experiment: ACCESS - 'Absolute Color Calibration Experiment for Standard Stars'. This calibration source, the...

Three different intensity monitors were tested in the external proton beam at LAMPF, and together cover the entire range of beam currents available. A 800 kg Faraday cup was installed and used to measure the absolute intensity to better than 1 percent for...

We have used images from the Advanced Camera for Surveys on the Hubble Space Telescope in H?, and in the neighboring continuum, to produce flux-calibrated images of the large spiral galaxy M51 and the dwarf irregular NGC 4449. From these images, we have derived the absolute luminosities in H?, the areas, and the positions with respect to the galactic ...

Permeation tubes were used to obtain an absolute calibration of flame photometric detector (FPD) to sulfur dioxide, hydrogen sulfide, methyl mercaptan, and carbon disulfide. Response data was obtained from 0.001 to 10 ppm. for each compound. Preliminary experiments with FPD as an ambient air sulfur dioxide monitor indicated that the detector has potential ...

The galaxy clustering correlation length r0 is studied using a variety of galaxy samples drawn from Huchra's CfA-I galaxy redshift catalogue (completeness limit mB less than or equal to 14.5) and the first CfA-II slice (mB less than or equal to 15.5). Estimates of r0 depend on the sample, and some samples show the well-known trend that r0 increases with sample depth. We study this phenomenon both ...

It is important to examine stellar parameters jointly�for example, stellar masses vs. luminosities, stellar luminosities vs. surface temperatures, etc. But comparisons between masses and parameters inferred from photometry, such as luminosities and temperatures, have been limited. This is because masses can be directly measured only ...

The Space Interferometry Mission (SIM) is the next major space mission in NASA's Origins program after SIRTF. The SIM architecture uses three Michelson interferometers in low-earth orbit to provide 4 microarcsecond precision absolute astrometric measurements on approx. 40,000 stars. SIM will also provide synthesis imaging in the visible waveband to a resolution of 10 ...

We present Period-Luminosity-Color and Period-Luminosity relations of classical Cepheids constructed for about 1280 Cepheids from the LMC and 2140 from the SMC. High quality BVI observations (120-360 epochs in the I-band and 15-40 in the BV-bands) were collected during the OGLE-II microlensing experiment. The I-band diagrams of the LMC show very small ...

A method for estimating the void probability function (VPF) from any volume- and absolute magnitude-limited galaxy catalog is developed and applied to three volume- and magnitude-limited subclasses from the CfA catalog which involve different luminosity classes. The VPF is calculated for each subclass and the count probability of finding N galaxies in a ...

During the year 2000 run a total of eight beam scans (Vernier Scans) were performed at various interaction points (IF) at RHIC. During a Vernier Scan the experimental collision rates are recorded while the beams are stepwise scanned across each other. Vernier Scans yield transverse beam sizes as well as maximum luminosity and thus the absolute cross ...

We present the Bright Quasar Survey (BQS) consisting of 114 objects to an average limiting magnitude B = 16.16 over an area of 10,714 deg/sup 2/. There are 92 quasars with M/sub B/<-23 in the sample. We use the BQS and complete samples from published surveys to derive models of the statistical evolution of quasars. The increase of space density with redshift depends strongly on ...

The five enigmatic cocoon stars, after which the Quintuplet cluster was christened, have puzzled astronomers since their discovery. Their extraordinary cool, featureless thermal spectra have been attributed to various stellar types from young to highly evolved, whereas their absolute luminosities place them among the supergiants. We present ...

The five enigmatic cocoon stars, after which the Quintuplet cluster was christened, have puzzled astronomers since their discovery. Their extraordinary cool, featureless thermal spectra have been attributed to various stellar types from young to highly evolved, whereas their absolute luminosities place them among the supergiants. We present ...

A uniform analysis of all 48 Wolf-Rayet stars observed with the IPC of the Einstein Observatory shows that their X-ray luminosities cover a range of more than two orders of magnitude. Most of the brightest stars are either also sources of nonthermal radio radiation, in which case the measurements interpreted as Compton scattering of photospheric radiation by relativistic ...

We discuss a scanner survey of the 0.7--1.1 $mu$ energy distributions of the nuclei of E/S0 galaxies ranging over a factor of 100 in intrinsic luminosity. There is a mild (color, absolute magnitude) correlation. The strength of the lambda8542 Ca II+TiO absorption feature appears to reach a maximum near M/subV/ approx. =-20.5, which may be due to ...

We have carried out a near-infrared search for companions around 23 very low-luminosity YSOs (VLL-YSOs) in the Taurus molecular cloud. Five extremely low-luminosity YSO (ELL-YSO) candidate companions were identified by both their near-infrared colors and proximity to the primary. They show infrared excess as ordinary YSOs. Their ...

The results of photometric classification in the Vilnius system of 117 Population II supergiants, suspected supergiants, and related stars are given. Their photometric spectral types, intrinsic color indices (Y-V)0, color excesses E(Y-V), metallicities Fe/H, and absolute magnitudes MV are determined. It is shown that the system allows us to detect the UU Herculis-type ...

Acceleration of charged particles along crystal channels has been proposed earlier in an attempt to achieve high acceleration gradient while at the same time to suppress excessive emittance growth. Recently the authors demonstrated that a particle in a generic focusing channel can in principle absolutely damp to its transverse ground state without any quantum excitation. This ...

PEACH1 has presented an important new set of values of M1, the absolute magnitude of the first brightest member of a rich cluster of galaxies, derived from unpublished data of Sandage. The results show again the small spread found by Humason, Mayall and Sandage2, but Peach finds that the standard deviation of the new M1 values is smaller by a factor of 2.7 than the standard ...

An anomalous transient in the early Hubble-type (S0) galaxy Messier 85 (M85) in the Virgo cluster was discovered by Kulkarni et al. on 7 January 2006 that had very low luminosity (peak absolute R-band magnitude M(R) of about -12) that was constant over more than 80 days, red colour and narrow spectral lines, which seem inconsistent with those observed in ...

Context. The Gaia satellite will measure highly accurate absolute parallaxes of hundreds of millions of stars by comparing the parallactic displacements in the two fields of view of the optical instrument. The requirements on the stability of the 'basic angle' between the two fields are correspondingly strict, and possible variations (on the microarcsec level) are therefore ...

Context. The Gaia satellite will measure highly accurate absolute parallaxes of hundreds of millions of stars by comparing the parallactic displacements in the two fields of view of the optical instrument. The requirements on the stability of the "basic angle" between the two fields are correspondingly strict, and possible variations (on the microarcsec level) are therefore ...

We used the HELIOS spectrometer at Argonne National Laboratory to study the neutron-adding (d,p) reaction on ^130,136Xe, in inverse kinematics. Of interest is the evolution of single-particle strength across the N=82 isotones in the case of ^136Xe, and nuclear structure relevant to the neutrinoless double beta decay matrix elements in the case of ^130Xe. A beam energy of 10 MeV/u was used for each ...

Neutron diffraction has been used to monitor the absolute stereochemistry of an enzymatic reaction. (-)(2S)malic-3-d acid was prepared by the action of fumarase on fumaric acid in D/sub 2/O. After a large number of cations were screened, it was found that (+)(R)..cap alpha..-phenylethylamine forms the large crystals necessary for a neutron diffraction ...

We examine volume-limited samples of galaxies drawn from the Sloan Digital Sky Survey to look for relations among internal and collective physical parameters of galaxies as faint as Mr=-17.5. We morphologically classify galaxies using u-r color, g-i color gradient, and concentration index. At fixed morphology and luminosity, we find that bright (Mr<-20) early types show ...

A new method is implemented by which to study the faint end of the field star luminosity function. The method relies on deep, multicolor photometry of fields projected against highly obscured, nearby molecular clouds. The clouds act as nearly opaque screens and delimit a well defined survey sample volume free of the problem of distinguishing nearby, intrinsically faint dwarf ...

DA{phi}NE, the Frascati {phi}-factory, is an e{sup +}/e{sup -} collider with 2 interaction points (IPs). The center of mass energy is 1020 MeV and the design luminosity 4.2x10{sup 30} cm{sup -2} s{sup -1} in single bunch mode and 5x10{sup 32} cm{sup -2} s{sup -1} in multibunch mode. Between the possible electromagnetic reactions at the interaction point, single bremsstrahlung ...

The D0 Run II Luminosity Monitor consists of plastic scintillation detectors with fine-mesh photomultiplier readout that cover the range 2.7 < {vert_bar}{eta}{vert_bar} < 4.4 in pseudorapidity. The detector is designed to provide a precise measurement of the rate for non-diractive inelastic collisions that is used to calculate the Tevatron ...

We analyze 3.5" resolution, high-sensitivity radio continuum images of the nearby spiral galaxy NGC 4258 at 6 and 20 cm derived from multiple observations used to monitor the radio supernova SN 1981K by Van Dyk et al. Seven bright H II regions and five supernova remnant candidates are identified. Extinctions to the H II regions are estimated for the first time from a ...

A prototype for the new DELPHI luminosity monitor has been built and tested. The scope of this prototype was to measure the response of the proposed calorimeter in the region which is most critical for the luminosity measurement, i.e. at the inner edge of the acceptance. The aim of the new luminosity ...

Simulation results of the Beam Rate of Neutrals (BRAN) luminosity detector for the CERN Large Hadron Collider are presented. The detectors are intended to measure the bunch-by-bunch relative luminosity at the ATLAS and CMS experiments. Building up from experimental results from test runs at the SPS, RHIC and ALS we extend the simulated setup to the TAN ...

The small beam spot size at the interaction point of the Next Linear Collider (NLC) makes the luminosity sensitive to beam jitter. A mechanism for aligning the beams to each other which acts during the bunch-train crossing time ({approx}260 ns) has been proposed to maintain luminosity in the presence of beam jitter. Conceptual designs of principal ...

To make precision measurements with a CsI(Tl) calorimeter in a high-luminosity environment requires that the crystals are well calibrated and continually monitored for radiation damage. This should not impact the total integrated luminosity which is particularly important for the BaBar calorimeter to enable it to make CP violation ...

We describe results from a beam test of a telescope consisting of three planes of single-crystal, diamond pixel detectors. This telescope is a prototype for a small-angle luminosity monitor, the Pixel Luminosity Telescope (PLT), for CMS. We recorded the pixel addresses and pulse heights of all pixels over threshold as well as the ...

Luminosity height profiles measured in the ray of artificial and natural auroras by highly sensitive television equipment with a super-orthicon are presented. It is noted that the photographic registration of the video monitor display image was made at a rate of 5 frames/sec and an exposition time of 0.17 sec. The artificial auroras were generated by ...

The formation and evolution of low-mass X-ray binaries (LMXBs) is not well understood. The properties of a population of LMXBs depend on a number of uncertain aspects of binary evolution, and population studies offers a relatively new way of probing binary interactions. We have studied the shape of the faint end of the X-ray luminosity function (LF) of LMXBs in nearby galaxies ...

The relative timing of electron and positron bunches at the SLC interaction point (IP) is affected by phase and energy fluctuations in various upstream systems. By shifting the collision point, IP timing variation may degrade the luminosity and hinder IP spot-size tuning. To monitor the timing stability, in 1997 a novel rf monitor was ...

The absolute branching fractions for the decays Ds-??-?�? (?=e, ?, or ?) are measured using a data sample corresponding to an integrated luminosity of 521fb-1 collected at center-of-mass energies near 10.58 GeV with the BABAR detector at the PEP-II e+e- collider at SLAC. The number of Ds- mesons is determined by reconstructing the recoiling system DKX? ...

We report a measurement of the cross section for production of isolated photons with transverse energy E{sub T} > 12 GeV in the central (absolute value of {eta} < 0.9) and forward (1.6 < absolute value of {eta} < 2.5) rapidity regions for {bar p}p collisions at center of mass energy {radical}s = 1.8 TeV, using an integrated ...

In table 5 and 6, we present the abundances of 15 chemical elements in 16 A and 26 F stars members of the Hyades open cluster. These abundances are relative to hydrogen and to the sun. The abundances derived for procyon are also included. The absolute parameters for the observed stars as the luminosity, effective temperature, mass and fractional age ...

The All-Sky Monitor, an imaging X-ray detector launched aboard the Ariel 5 satellite, was used to obtain detailed light curves of three new sources. Additional data essential to the determination of the characteristic luminosities, rates of occurrence (an...

The Tully-Fisher (TF) or the luminosity-linewidth relations of the galaxies in the Eridanus group are constructed using the HI rotation curves and the luminosities in the optical and in the near-infrared bands. The slopes of the TF relations (absolute magnitude vs log 2 flat) are -8.6 �1.1, -10.0 �1 5, -10.7 �2.1, and -9.7 �1.3 ...

The spectral energy distribution of stars of early and intermediate spectral type has been investigated in terms of spectral gradients. Observational data on stellar energy distribution are taken from recent catalogs of absolutely calibrated spectrophotometric data. For the stars of early spectral type these data refer to the true stellar continuum, for stars of intermediate ...

We present imaging and spectroscopic observations for six quasars at z {>=} 5.9 discovered by the Canada-France High-z Quasar Survey (CFHQS). The CFHQS contains subsurveys with a range of flux and area combinations to sample a wide range of quasar luminosities at z {approx} 6. The new quasars have luminosities 10-75 times lower than the most ...

In 1957, Olin Wilson and Vainu Bappu published evidence for a direct correlation between the width of the 3933A Ca K line emission core seen in late type stars, and the stellar absolute magnitude, Mv. In 1977, the third author on this abstract published a spectroscopic survey that showed the wing emission features seen in the broad wings of the K line among higher ...