The use of a gas absorption cell as the velocity metric has become a standard method of achieving the very high velocity precision necessary for detection of low-mass planetary companions to nearby stars. At present, I2, is the most commonly used gas. This gas absorption cell technique has a number of significant advantages: 1) The I2, spectrum is an ...

Telluric absorption inside our coud� spectrograph is used as a reference spectrum for precise radial velocity measurement. The optical path for this telluric absorption is stable and is not compromised by atmospheric disturbances, such as the jet stream. As an added bonus, the telluric fiducial spectrum is free; i.e., one does not ...

... grating spectrograph. The relation of the spectrum to that of other actinide and rare-earth compounds is discussed. It has ...

... It was found that the heavy absorption of the silicate base oil obscured absorption bands of all additives tested in it. In the petroleum base oils the ...

In this paper we examine the profiles of the complex Na I D-lines in the Red Rectangle. The spectra were acquired with the Astrophysical Research Consortium Echelle Spectrograph (ARCES) echelle spectrograph (R= 38 000) on the 3.5-m telescope at the Apache Point Observatory. Additional spectra taken with Space Telescope Imaging ...

... Title : ABERRATIONS IN A SYSTEM OF TWO SPHERICAL MIRRORS, AND THEIR INFLUENCE ON THE LINE PROFILE OF A SPECTROGRAPH,. ...

The optical spectrograph and infrared imager system (OSIRIS) on board the Odin spacecraft is designed to retrieve altitude profiles of terrestrial atmospheric minor species by observing limb-radiance profiles. The grating optical spectrograph (OS) obtains spectra of scattered sunlight over the range 280-800 nm with ...

We have constructed a high resolution imaging spectrograph for use as a payload in a sounding rocket

... understanding of cross-correlation measurements, radioactive decay, gas absorption, and mass spectrograph and ultracentrifuge analysis curves. ...

a differential scanning calorimeter, gas chromatography, gas chromatography/mass spectrograph, atomic absorption spectrophotometer, inductively coupled ...

The results of high-dispersion spectrographic observations of the H$alpha$ region in the spotted flare star BY Draconis are presented. A ''Zeeman'' spectrogram obtained with the starspot near the limb shows obvious differences between the H$alpha$ emission profile seen in the different senses of circular ...

A process for the purification of cadmium metal by multiple treatment steps is described. Impurities in cadmium, as determined by emission spectrographic, mass spectrographic, and atomic absorption are given in tabular form. The preparation of various pur...

The localization of a laser beam in a small area of a solid steel sample (steel with high Cr content) is described. A continuous spectrum with absorption lines (due to absorption of atoms mainly) is emitted and registered by a spectrograph. The lines Ni I...

The spectral absorption of C3 has been measured in a shock tube using a test gas mixture of acetylene diluted with argon. The absorption of a pulsed xenon light source was measured by means of eight photomultiplier channels to a spectrograph and an accomp...

The short-time scale spectroscopic variability of some Be stars has been investigated with an optical fiber spectrograph and a CCD camera. Findings on a time-scale of hours and days include: (1) weak changes in the H-alpha emission line profile of gamma Cas; (2) changes in the structure and the intensity of the H-alpha emission line core and sometimes in ...

Simultaneous observations of profiles of He I ?10830 and the Ca II H line in sunspot umbrae have been made with the Tower telescope, echelle spectrograph, and multidiode array at the National Solar Observatory/Sunspot. These observations reveal the nature of fluid motions in the upper chromosphere during the cycle of umbral oscillations. Time sequences of ...

A system of exact ray-tracing formulae has been developed for two spherical mirrors. The bundles of rays are supposed to be paralell between the mirrors. For a particular case, ie. the mirrors used in the horizontal spectrograph in the tower telescope at ...

The solar profile of hydrogen Ly ..beta.. has been photographed by the Naval Research Laboratory slit spectrograph on Skylab. The line profile has a shape that is similar to the profile recorded in 1962 by Tousey et al. (1964). (AIP)

Recently it has been suggested (Massa 1992; Howarth & Reid 1993), from the C IV ultraviolet resonance line profile of HD 93521, that there is a high-speed component in the polar outflow from the star as well as a low-speed component in the equatorial regions. In this paper we present theoretical calculations of the line profiles that would be produced ...

We present the transmission spectra of the hot-Jupiter HD209458b taken with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope. Our analysis combines data at two resolutions and applies a complete pixel-by-pixel limb-darkening correction to fully reveal the spectral line shapes of atmospheric absorption features. Terrestrial-based ...

We report on high resolution echelle spectroscopy of the 2009.0 spectroscopic event of eta Carinae that we collected via SMARTS observations using the CTIO 1.5 m telescope and echelle spectrograph. Our observations were made almost every night over a two month interval around the predicted minimum of eta Car. We observed a dramatic fading of the H-alpha line emission that ...

The assembly of laboratory spectrographs from individual components is a valuable exercise in an undergraduate setting. We describe several different spectrograph configurations that we have implemented with electronic panoramic detectors and present the data acquired with each of them, concentrating on the detection and measurement of Doppler shifts of ...

An iodine absorption tube has been used at the Sacramento Peak Observatory Diode Array for monitoring the effects of spectrograph drift. This wavelength calibration device has the capability of monitoring instrumental drifts to within a few tenths of a milliangstrom. Full disk solar velocity observations are shown, with and without the calibration provided ...

We describe the use of Externally Dispersed Interferometry (EDI) for high-resolution absorption spectroscopy. By adding a small fixed-delay interferometer to a dispersive spectrograph, a precise fiducial grid in wavelength is created over the entire spectrograph bandwidth. The fiducial grid interacts with narrow spectral features in ...

We describe the use of Externally Dispersed Interferometry (EDI) for high-resolution absorption spectroscopy. By adding a small fixed-delay interferometer to a dispersive spectrograph, a precise fiducial grid in wavelength is created over the entire spectrograph bandwidth. The fiducial grid interacts with narrow spectral features in ...

... Title : Optical Absorption Depth Profiling of Photodegraded Poly (Vinylchloride) (PVC) Films by Quantitative Photothermal Deflection Technique,. ...

... Title : ULTRASONIC ABSORPTION SPECTROSCOPY IN FLUIDS BY OPTICAL DETECTION OF PHOTOACOUSTIC PULSE PROFILES. ...

... Title : EFFECT OF VOLUMETRIC ABSORPTION COEFFICIENT ON ... Abstract : In calculating the temperature profile and heat transfer ...

... Title : EFFECT OF VOLUMETRIC ABSORPTION COEFFICIENT ON ... Abstract : In calculating the temperature profile and heat transfer ...

Stars are observed with a ground-based instrument designed to measure small changes in the line-of-sight velocities. The purpose of the observations is to detect large planets by the oscillatory reflex motion they induce on the stars they are orbiting. The instrument is an optical spectrometer for which wavelengths are first calibrated by transmission through a tunable Fabry-Perot etalon ...

Although methane is the dominant absorber in Titan�s reflection spectrum, the amount of methane in the atmosphere has only been determined to an order of magnitude. We analyzed spectra from the Space Telescope Imaging Spectrograph, looking at both a bright surface region (700-km radius) and a dark surface region. The difference between the spectra of the two regions is ...

We present new planetary nebulae (PNe) positions, radial velocities and magnitudes for six early-type galaxies obtained with the Planetary Nebulae Spectrograph (PNS), along with derived two-dimensional velocity and velocity dispersion fields, and the ? parameters (i.e. the number of PNe per unit luminosity). We also present new deep absorption-line ...

We examine the velocity structure in the gas associated with H I in the damped Ly? absorption system at redshift z= 1.7764 towards the QSO 1331 + 170 using Arecibo H I 21-cm data, optical spectra from the Keck High Resolution Echelle Spectrograph (HIRES) and European Southern Observatory (ESO) Very Large Telescope (VLT) Ultraviolet and Visual Echelle ...

Spectroscopy of T Pyx was obtained on SALT with the Robert Stobie Spectrograph (RSS) on UT 2011 April 15 21:22 - 21:36, 1.6 days after its reported outburst and during the current RSS re-commissioning phase, which began on 9 April. The spectra were taken with a 0.6 arcsec wide slit in two regions, 535 - 630 nm (R = 8500; 3 x 30 s exposures) and 620-700 nm (R = 11200, 6 x 30 s ...

Despite the increasing numbers of O VI absorbers observed, the ionization mechanisms of these systems is still not well understood. Both photo and collisional ionization seem to play roles in the ionization of the gas in these systems. In order to place constraints on the baryon fractions as traced by O VI absorbers, the ionization mechanisms must be well understood. Part of the confusion is due ...

The authors have made accurate observations of the changes in Doppler shift of stellar absorption lines. The scrambling of incident light by an optical fiber and the stability of wavelength calibration by a tilt-tunable Fabry-Perot etalon provide immunity to systematic errors. A cross-dispersed echelle spectrograph spatially separates the orders of ...

The Interstellar Medium Absorption Profile Spectrograph (IMAPS) is an objectivegrating, echelle spectrograph built to observe the spectra of bright, hot stars over the spectral region 950 1150�, below the wavelength coverage of HST. This instrument has a high wavelength resolving power, making it especially well ...

The infrared absorption spectra of the hexahydrates of the double sulfates of the magnesium series provided evidence confirming the existence of strong hydrogen bonds between the water molecules and the rest of the molecule. (Author)

The absorption spectrum of metastable O2, excited by a microwave discharge, has been photographed in second order of the helium continuum with a 6.65 m vacuum spectrograph. The band progression in the 835-900 A region has been investigated further.

An apparatus is described for the recording of transients in the nanosecond region by means of pulsed laser excitation and spectrographic pulsed recording. The method has been used to record absorption spectra of excited singlet states. (Author)

The ten-meter vacuum spectrograph was employed to study absorption spectra of ArF and KrF excimer laser. A diffuse-looking line was formed near 1931 A for Ar F and a rotational analysis was performed. (AIP)

Hubble Space Telescope Faint Object Spectrograph (HST FOS) observations have shown that the spectrum

A basic spectrographic study of ferroelectric/elastic (Gd(.8)Eu(.2))2(MoO4)3 was completed. The absorption and emission were looked at under different temperatures and excitation. For absorption the Cary 14 was used and data was taken at room temperature,...

We present preliminary results of a study of small scale (500-20000 AU) structure in the cold diffuse ISM. We have observed the Na I absorption toward both components of 17 binary or common proper motion systems with the KPNO 0.9 m coude feed telescope and spectrograph at a velocity resolution of ~ 1 km/s. The stars range in spectral type from O6 to A3, ...

We report observations of Lyman alpha blob 1 (LAB1) in the SSA 22 protocluster region (z = 3.09) with the integral-field spectrograph SAURON. We increased the signal-to-noise ratio in the spectra by more than a factor of 3 compared to our previous observations. This allows us to probe the structure of the LAB system in detail, examining its structure in the spatial and ...

Middle ultraviolet spectra of the atmospheric airglow were obtained from a March 1992 rocket flight of the NPS MUSTANG instrument. These spectra are analyzed from 1900 A to 3100 A, over an altitude range of 100 km to 320 km. The data are modeled with computer generated synthetic spectra for the following emissions: N2 Vegard Kaplan (VK); N2 Lyman-Birge-Hopfield (LBH); and NO Gamma, Delta, and ...

Jul 29, 2004 ... --A Background Limited Infrared-Submillimeter Spectrograph for Spica: Revealing the Nature of the Far-Infrared Universe, Matt Bradford, JPL, ...

... Resolution Spectrograph Investigation (MAHRSI) obtained vertical profiles of OH number density and polar mesospheric cloud (PMC) brightness ...

The Self-Calibrating H2O and O3 Nighttime Environmental Remote Sensor (SCHOONERS) is a compact, integrated UV-IR imaging spectrograph and imager for spaceborne stellar occultation measurements, developed under the NASA Instrument Incubator Program and based on the measurement technique and retrieval demonstrated by the MSX/UVISI instrument. The imaging ...

Previous measurements of the 911 � emission made by sounding rockets, at altitude less than 320 km, indicated that the emission was either very weak or non-existent. Newer measurements made by the Remote Atmospheric and Ionospheric Detection System (RAIDS) currently in operation aboard the International Space Station, at an altitude of 340 km, show the same behavior. Yet, satellite-based ...

We present six new and two previously published high-resolution spectra of the quasar HS 1603+3820 (zem=2.542) taken over an interval of 4.2 yr (1.2 yr in the quasar rest frame). The observations were made with the High Dispersion Spectrograph on the Subaru telescope and the Medium Resolution Spectrograph on the Hobby-Eberly Telescope. The purpose was to ...

We present absorption line analysis of the outflow in the quasar IRAS F04250�5718. Far-ultraviolet data from the Cosmic Origins Spectrograph on board the Hubble Space Telescope reveal intrinsic narrow absorption lines from high ionization ions (e.g., C IV, N V, and O VI) as well as low ionization ions (e.g., C II and Si III). We ...

We present a study of the intrinsic X-ray and far-ultraviolet absorption in the Seyfert 1.5 galaxy Markarian 279 using simultaneous observations from the Chandra X-ray Observatory, the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope, and the Far Ultraviolet Spectroscopic Explorer (FUSE). We also present FUSE observations made at ...

We searched for 21-cm absorption associated with the zabs = 1.3647 absorption system towards the gigahertz peaked-spectrum source PKS0237-233 using the Giant Metrewave Radio Telescope (GMRT). A high quality Ultraviolet and Visible Echelle Spectrograph (UVES) spectrum shows that CI and CI* are detected at this redshift together with ...

The Optical Spectrograph and InfraRed Imaging System (OSIRIS) on-board the Odin Satellite has been measuring O2 A-band airglow emission in the mesosphere and lower thermosphere (MLT) for the past nine years. OSIRIS observations of A-band limb spectra are inverted in order to derive temperature profiles in the MLT. Retrieved temperature ...

We present high resolution (R = 114,000) ultraviolet measurements of the interstellar absorption line profiles of the C IV (1550 �) high ionization doublet recorded toward the nearby B2Ve star HD 158427 (d ~ 74 pc). These data, which were recorded with the recently re-furbished Space Telescope Imaging Spectrograph instrument on the ...

The Herbig Ae variable, AB Aur, has been observed with the CFHT coude spectrograph at 95 mA resolution for five consecutive nights in the blue spectral region and with the IUE satellite in the high resolution, long wavelength mode. The Ca II K line shows an asymmetric and variable profile and shows weak emission in the absorption core ...

Observations at a resolving power or a velocity resolution are reported of the interstellar D{sub 1} line of Na I in the spectra of Gamma Cas, Delta Ori, Epsilon Ori, Pi Sco, Delta Cyg, and Alpha Cyg. An echelle grating was used in a double-pass configuration with a CCD detector in the coude spectrograph of the 2.7 m reflector at McDonald Observatory. At least 42 kinematically ...

We report on H? spectroscopy of the 2009.0 spectroscopic event of ? Carinae collected via SMARTS observations using the Cerro Tololo Interamerican Observatory 1.5 m telescope and echelle spectrograph. Our observations were made almost every night over a two-month interval around the predicted minimum of ? Car. We observed a significant fading of the line emission that reached ...

We present results from our spectroscopic study, using the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope, designed to identify massive young stellar objects (YSOs) in the Galactic Center (GC). Our sample of 107 YSO candidates was selected based on IRAC colors from the high spatial resolution, high sensitivity Spitzer/IRAC images of the central 300 pc of the ...

Slit spectrophotometry in the 305-855-nm range of 25 QSO candidates identified by slitless spectroscopy in two 1-deg-sq fields (one centered on Abell 2151 and one in a blank region) near the Hercules cluster of galaxies, obtained using image-dissector scanners on the 3-m Lick Observatory and 4-m KPNO telescopes at resolution 5-20 A during 1976-1979, are reported. The data are presented in tables ...

Spectrographs of the H-alpha line taken at 15 second intervals from the event of 5 Sept. 1973 were interpreted by comparison with synthetic profiles. A sequence of 27 high resolution H alpha profiles was obtained from the second brightest flare kernel. Th...

Traces of rare earths elements, mainly those possessing high thermal neutron absorption cross sections: Gd, Dy, Er, Sm, and Eu, were determined spectrographically after chemical separation from uranium. Uranyl chloride in hydrochloric acid was extracted with TBP, the rare earths were coprecipitated with thorium ammonium fluoride, Th was removed ...

FIREBall (the Faint Intergalactic Redshifted Emission Balloon) is a balloon-borne 1m telescope coupled to an ultraviolet fiber-fed spectrograph. FIREBall is designed to study the faint and diffuse emission of the warm hot intergalactic medium, until now detected primarily in absorption. FIREBall is a pathfinding mission to test new technology and make new ...

The intermediate-mass, pre-main-sequence (Herbig Ae/Fe) stars HD135344B (F4) and HD104237 (A8 IV-V) are both still surrounded by almost face-on circumstellar disks. The disk around HD135344B is a ``transitional'' disk with a 25 AU radius cleared inner hole but still with some gas and dust very close to the star. We have obtained FUV spectra of these stars using the HST COS and STIS ...

Optical interstellar absorption line profiles in the spectra of 22 stars within the Carina Nebula, observed using the 4-m echelle spectrograph at resolving powers of 3-6 x 10 to the 4th, are presented. Radial velocities, representative column densities, and equivalent widths are given for resolved velocity components. As many as 12 ...

We announce the detection of two fully resolved hyperfine components of the intercombination line of Tl II (Z = 81) at 1908.6 � in the ultraviolet spectrum of the sharp-lined, nonmagnetic, chemically peculiar star ? Lupi (B9.5pHgMn + A2 Vm). The wavelengths and profiles of these absorption lines strongly suggest that they arise from the heaviest isotope, ...

Semiquantitative spectrographic analyses are given in percent for Fe, Mg, Ca, and Ti, and in parts per million for Mn, Ag, B, Ba, Co, Cr, Cu, La, Mo, Ni, Pb, Sc, Sr, V, Y, Zn, and Zr. Atomic absorption analyses in parts per million are given for Zn, Ag, C...

A double-beam atomic absorption spectrographic analysis system using a dc arc multielement source was tested for water analysis. The report briefly describes these tests. The optical system design brings analytical and reference beams together to illumina...

High quality spectra of interstellar absorption from C I toward beta(sup 1) S(sub co), rho O(sub ph) A, and chi O(sub ph) were obtained with the Goddard High Resolution Spectrograph on HST. Many weak lines were detected within the observed wavelength inte...

We present a study of reddening and absorption toward the narrow line regions (NLRs) in active galactic nuclei (AGNs) selected from the Revised Shapley-Ames, 12 ?m, and Swift/Burst Alert Telescope samples. For the sources in host galaxies with inclinations of b/a > 0.5, we find that the mean ratio of [O III] ?5007, from ground-based observations, and [O IV] 28.59 ?m, from ...

We present results from our spectroscopic study, using the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope, designed to identify massive young stellar objects (YSOs) in the Galactic center (GC). Our sample of 107 YSO candidates was selected based on Infrared Array Camera (IRAC) colors from the high spatial resolution, high sensitivity Spitzer/IRAC images in ...

Studies of small-scale dynamical features on the quiet Sun are crucial for understanding the energetics and mass supply in the chromosphere and corona. Recent works by Wang and coworkers revealed the existence of numerous short-lived upflow events in H? on the quiet Sun. In this paper we examine in detail the dynamical characteristics of these H? upflow events based on H? ...

profiles obtained by differential absorption lidar (DIAL) analysis. ... Differential absorption lidars (DIAL) have been and continue to be widely used for the ...

In the belief that further progress in understanding the dynamical behavior following photoexcitation of gas phase molecules can be stimulated by the availability of improved time-resolved spectrographic apparatus (i.e. shorter, more intense, UV excitatio...

Radial velocities from 6 exoplanet host stars. The velocities are extracted from the CORALIE and HARPS spectrographs by means of a cross-correlation and the subsequent fit of a Gaussian on the resulting mean absorption line. (2 data files).

The observed strength of the carbon dioxide absorption bands recorded on spectrobolograms of the transparency of the earth's atmosphere between wavelengths 300 and 2500 nanometers as part of the Smithsonian Solar Constant Program were used to extract the ...

One occasionally observes in flux-grown gallium and aluminum garnets a purple discoloration. Combined optical absorption, emission spectrographic and electron microprobe studies of crystals showing pronounced color banding indicate a direct correlation be...

are tabulated in table 8 and represent the authors's by�eye current working guess. Uncertainty appears missing data are due to the spectrograph settings in some runs that excluded the bluest parts

Describes a course in chemical instrumentation for high school chemistry teachers, paid for by Union Carbide. Teachers used spectrophotometer, nuclear magnetic resonance spectrometer, atomic absorption spectrograph, gas chromatograph, liquid chromatograph and infrared spectrophotometer. Also describes other teacher education seminars. (JM)

Key to understanding and predicting the effects of global environmental problems such as ozone depletion and global warming is a detailed understanding of the atmospheric processes, both dynamical and chemical. Essential to this understanding are accurate global data sets of atmospheric constituents with adequate temporal and spatial (vertical and horizontal) resolutions. For this purpose the ...

To investigate the far-UV spectral properties of a QSO and to look for evidence of He I 584 A emission and absorption the Faint Object Spectrograph aboard the HST was used to observed UM 675. Light is detected down to 520 A in the object in the rest frame and limits are set to He I emission, the He I Gunn-Peterson effect at z = 2.148, and Ly-alpha ...

We present imaging and spectroscopy of the quasar 3CR 196 (z(sub e) = 0.871), which has 21 cm and optical absorption at z(sub a) = 0.437. We observed the region of Ly alpha absorption in 3CR 196 at z(sub a) = 0.437 with the Faint Object Spectrograph on th...

We report the detection of 21-cm and molecular hydrogen absorption lines in the same damped Lyman ? system (DLA; with log N(HI) = 21.36 +/- 0.10) at zabs = 3.17447 towards SDSSJ133724.69+315254.55 (zem ~ 3.174). We estimate the spin temperature of the gas to be TS = 600+222-159K, intermediate between the expected values for cold and warm neutral media. This suggests that the ...

... In addition the relative emission coefficient, the relative temperature and the optical density profile can be determined. (Author). ...

... Title : FREE CARRIER DENSITY PROFILING BY SCANNING ... UPON THE FREE CARRIER ABSORPTION OF ... POWER FREE CARRIERS PER CM ...

The theory of differential absorption lidar measurements for lines with a Voigt profile is given and

Voigt profile, continuum absorption model of AER (Clough et al.);. " atmospheric profiles of Standard Models (MODTRAN3.0) ...

This preliminary study of the detailed chromospheric conditions of G-type Ib-supergiants provides a foundation for atmospheric models, complementing STIS and FUSE surveys of cool stars. We compare optical and near-UV high-resolution Utrecht Echelle Spectrograph (William Herschel Telescope), and SOFIN (Nordic Optical Telescope) echelle spectra of ? Aqr (G2 Ib), 9 Peg (G5 Ib), ...

... PROFILE IN THE IONOSPHERIC D-REGION FROM THE FREQUENCY DEPENDENCE OF RADIO WAVE ABSORPTION-GEOMAGNETISM AND ...

... CONCENTRATION PROFILE IN THE D-LAYER OF THE IONOSPHERE FROM THE FREQUENCY DEPENDENCE OF RADIO WAVE ABSORPTION ...

The design and operation of a differential absorption lidar system capable of remotely measuring the

We have observed the violet spectra of three carbon stars, BM Gem, V778 Cyg, and EU And, that are associated with silicate dust emission features as well as that of a proto-typical J-type carbon star, Y CVn, with the high dispersion spectrograph (HDS) on SUBARU telescope. The spectrum of BM Gem has revealed the presence of Balmer lines up to H23, all of which are found to have ...

WE PROPOSE TO USE THE ECHELLE AND 160M GRATINGS OF THE HIGH RESOLUTION SPECTROGRAPH OVER A TWO-YEAR PERIOD TO OBSERVE THE PROFILES OF INTERSTELLAR ABSORPTION LINES. THE COLUMN DENSITES OF 18 NEUTRAL OR IONIZED FORMS OF THE ELEMENTS C,N,O,Mg,Si,P,S,Fe, AND Zn WILL BE MEASURED IN THE APPROXIMATELY 100 INDIVIDUAL INTERSTELLAR CLOUDS ALONG ...

WE PROPOSE TO USE THE ECHELLE GRATING OF THE HIGH RESOLUTION SPECTROGRAPH OVER A TWO-YEAR PERIOD TO OBSERVE THE PROFILES OF INTERSTELLAR ABSORPTION LINES. THE COLUMN DENSITES OF 18 NEUTRAL OR IONIZED FORMS OF THE ELEMENTS C,N,O,Mg,Si,P,S,Fe, AND Zn WILL BE MEASURED IN THE APPROXIMATELY 100 INDIVIDUAL INTERSTELLAR CLOUDS ALONG THE LIGHT ...

WE PROPOSE TO USE THE ECHELLE GRATING OF THE HIGH RESOLUTION SPECTROGRAPH OVER A TWO-YEAR PERIOD TO OBSERVE THE PROFILES OF INTERSTELLAR ABSORPTION LINES. THE COLUMN DENSITES OF 18 NEUTRAL OR IONIZED FORMS OF THE ELEMENTS C,N,O,Mg,Si,P,S,Fe, AND Zn WILL BE MEASURED IN THE APPROXIMATELY 100 INDIVIDUAL INTERSTELLAR CLOUDS ALONG THE LIGHT ...

Recently, the 1326-1466 � region of the FUV spectrum of the K4 Ib-II supergiant Lambda Vel was observed with the Cosmic Origins Spectrograph (COS) on HST, as part of the Ayres and Redfield Cycle 17 SNAP program "SNAPing Coronal Iron.� This spectrum covers a region not previously recorded in Lambda Vel at high resolution and, in a mere 20 minutes of exposure, reveals an ...

Global changes of zonal cloud structure on Jupiter have been observed and analyzed from data obtained with a 1-m telescope and a low-dispersion spectrograph in the spectral range wavelengths 400-680 nm, and with a 70-cm telescope and planetary three-channel spectrometer in the spectral range wavelengths 320-1100 nm during each Jovian apparition from 1988 to 1992. Variations of ...

NGC 4365 is a photometrically ordinary, but kinematically intriguing, E2-3 galaxy. The map of the stellar mean velocity field obtained by the SAURON integral field spectrograph on the William Herschel Telescope shows that the apparent rotation axis, or zero-velocity contour (ZVC), is unaligned with the photometric axes, and that the velocity field (VF) is not symmetric about ...

We report on the preliminary results of a three-year monitoring campaign of southern luminous blue variables with the Cassegrain and Echelle spectrographs at the CTIO 1.5 m telescope. We have collected more than 300 moderate-resolution spectra of 20 stars in the red portion of the optical spectrum, which includes the wind-sensitive transitions of H-alpha and He I 5876 and 6678 ...

Instrumentation and analysis techniques aimed at establishing the relationships between remotely sensed meteorological and visibility parameters of the atmosphere are discussed. It is shown that long and short term visibility and atmospheric extinction trends are dominated by meteorological parameters. A report is made of new instrumentation and preliminary results using these instruments to ...

Results are reported for a study of the near-UV spectrum of Arcturus as recorded with a balloon-borne echelle spectrograph-vidicon detector system in the spectral region from 2700 to 3300 A at 0.1-A resolution. A condensed version of the Arcturus spectrum is provided along with profile descriptions and identifications for 383 ...

We present an analysis of how bisectors of spectral lines vary, for a few stars observed during the high-accuracy radial-velocity planet survey ongoing at the Telescopio Nazionale Galileo (TNG) using the Galileo High Resolution Spectrograph (Spettrografo Alta Risoluzione Galileo, SARG), and discuss their relation with differential radial velocities. The iodine cell lines ...

We have obtained a Hubble Space Telescope ultraviolet image and spectrum of the nearby Wolf-Rayet galaxy NGC 1741. The spatial morphology from the Faint Object Camera image is dominated by two main starburst centers, each being about 100 times as luminous as 30 Doradus. Both starburst centers are composed of several intense knots of recent star formation. A Goddard High Resolution ...

An investigation was conducted to explore the use of infrared and ultraviolet emission-absorption spectroscopy for determination of temperature profiles in flames. Spectral radiances and absorptances were measured in the 2.7-micron H2O band and the 3064-A...

Calculation was made of the line profiles to be expected when a Fabry-Perot interferometer is used to measure absorption lines. It is shown that large errors may be introduced in the measurement of the integrated absorption, even when an interferometer of...

Cool star winds can best be observed in resonance absorption lines seen in the spectrum of a hot companion, due to the wind passing in front of the blue star. We calculated absorption line profiles that would be seen in the ultraviolet part of the blue co...

Profiles of the flow variables for a shock in CO2 are obtained via Kerr-cell shuttered spectroscopy. A novel, two-stage electric shock tube operating at an initial pressure of 100 Torr is used. The presence of thermodynamic equilibrium is experimentally v...

Low frequency gratings obtainable with present technology, can meet the grating-efficiency design goals for potential space telescope spectrographs. Gratings made with changes in the three specific parameters: the ruling tool profile, the coating material...

We present medium-resolution ultraviolet interstellar absorption measurements recorded with the HST-COS and FUSE spectrographs toward the post-AGB star Barnard 29 in the M13 globular cluster. Inspection of the UV spectra has revealed absorption at V�-60 km s in the ...

We report on a study of interstellar silicate dust in five quasar absorption systems at 0.44 < z abs < 1.31 toward quasars Q0235+164, 3C196, Q0852+3435, Q0937+5628, and Q1203+0634, using data from the Infrared Spectrograph on board the Spitzer Space Telescope. In the absorbers toward Q0235+164, 3C196, Q0852+3435, and Q0937+5628, the 9.7 ?m silicate ...

H? CCD spectra of the short-period Algols TX UMa, RW Tau, and ? Per were obtained with the stellar spectrograph on the 1.5m telescope at the McMath Solar Observatory, NOAO, during the night-time synoptic program from 1989 to 1992. These data are part of a long-term project to determine precise spatial information about the circumstellar material in these systems from spectra ...

A NEW absorption band has been observed, with a Hilger E1 glass spectrograph, on the shorter wavelength side of the second member of the rubidium principal series, in the presence of neon, helium, hydrogen or nitrogen. The position of the band depends on the nature of the foreign gas admitted into the absorption tube, which was kept at ...

The intrinsic mid-infrared optical absorption of a ZrF(4)-BaF(2)-LaF(3)-AlF(3)-NaF (ZBLAN) glass has been determined by combining laser calorimetry and spark-source mass spectrographic analysis. The total optical absorption of four samples of varying purity was measured at 3.9 microm with laser calorimetry. The extrinsic contribution ...

Measurements of the He D/sub 3/ profile in plages are presented. The observations were made at the Mees Solar Observatory, Mount Haleakala, using the 25 cm coronagraph/3 m spectrograph with a Si vidicon detector system. Differencing the nearby quiet Sun and plage spectra allows us to obtain accurate D/sub 3/ plage profiles, ...

We have acquired spectra of the optical interstellar absorption lines of Ca II and Na I for 68 OB stars in the direction of the Vela supernova remnant. The data, which were obtained using the echelle spectrograph on the Coude Auxiliary Telescope of the European Southern Observatory, have high spectral resolution (R ~ 75,000) and high signal-to-noise ratios ...

FIREBall (Faint Intergalactic Redshifted Emission Balloon) had a successful first engineering flight in July of 2007 from Palestine, Texas. Here we detail the design and construction of the spectrograph. FIREBall consists of a 1m telescope coupled to a fiber-fed ultraviolet spectrograph flown on a short duration balloon. The ...

Five systems of absorption bands of N2, were investigated in the 1070-1600-A region. A 2-m ad a 3-m vacuum spectrograph, both of normalincidence-type, were used in this work. A final designation of the upper electronic state must come from a rotational an...

The absorption spectrum of molecular hydrogen has been investigated in the 950-700 A region with a 6.65-m normal-incidence spectrograph in the second order with the helium continuum as background. Seventeen Rydberg series are identified. The lowest ioniza...

Absorption spectra were obtained between 500 and 100 A (25-125 eV) for several gases: NO, CO, CO2, H2O, NH3, CH4 using a grazing incidence grating spectrograph, a condensed spark as the continuum background and very thin layers of appropriate materials fo...

In the course of our motion through the Galaxy, the Solar System has encountered many interstellar environments of varying characteristics. ISM density variations spanning six orders of magnitude are commonly seen throughout the general Galactic environment, and a sufficiently dense cloud within this range has the potential to compress the heliosphere to within one Astronomical Unit. We present a ...

Absorption observations of the CH+ molecule with column densities of up to 1014 cm-2 in diffuse molecular clouds in many lines of sight are reviewed, and compared to the reddening and to abundances and velocity shifts of molecules like CH. Special attention is placed on the observations of the line of sight towards ? Ophiuchi where high quality observations of many chemical ...

The instrumental profile of the fifth order was studied photometrically using the krypton emission line ?5570 �. The method of photometric data processing is described. A comparison of instrumental profiles of the 5th and 4th orders shows fairly good coincidence.

Resonance Raman spectroscopy is an enhanced Raman technique that can be used to selectively identify a particular analyte in complex matrices. Resonance Raman requires the excitation laser to overlap with an absorption band of the analyte of interest. Since analytes have diverse absorption spectra, dilute concentrations may be detected when resonantly ...

We report moderate resolution 3-5 {mu}m spectroscopy of the nucleus of NGC 1068 obtained at 0.''3 (20 pc) resolution with the spectrograph slit aligned approximately along the ionization cones of the active galactic nucleus. The deconvolved full width at half-maximum of the nuclear continuum source in this direction is 0.''3. Four coronal ...

High-resolution spectra between 3100 and 7180 A of the quasar PKS 0528-250 are presented. The spectra were obtained at a resolution of about 2 A FWHM with the image-photon counting system and RGO spectrograph on the Anglo-Australian 3.9-m telescope. Absorption line systems are identified at red shifts of 2.81322, 2.81100, 2.53758 and 2.14077, corresponding ...

We present the first ground-based detection of optical transmission absorption caused by the atmosphere of a transiting extrasolar planet. We combine multiple in-transit observations taken by the 9.2m Hobby-Eberly Telescope (HET) and compare directly with out-of-transit observations. Without high resolution space-based optical or UV spectrographs, ...

One of the most promising techniques for detecting acoustic oscillations in solar-type stars is the measurement of minute radial velocity shifts produced by the oscillations. Photon noise limitations can be alleviated by using an echelle spectrograph to observe Doppler shifts in a large number of spectral lines simultaneously. The new East Arm Echelle ...

The Keck telescope's High Resolution Spectrograph (HIRES) has previously provided evidence for a smaller fine-structure constant, ?, compared to the current laboratory value, in a sample of 143 quasar absorption systems: ??/?=(-0.57+/-0.11)10-5^. The analysis was based on a variety of metal-ion transitions which, if alpha varies, experience different ...

The complex spectral features and the results of recent studies for chemically peculiar (CP) stars are reviewed with the emphasis on the magnetic peculiar and mercury-manganese stars. We stress that modern analyses using high dispersion spectrographs including HDS (High Dispersion Spectrograph) at the Subaru telescope (NAOJ) and recent atomic data have ...

Certain rare earths possessing high thermal neutron absorption cross sections, when present in only trace quantities in metals used in nuclear technology, must be separated before a satisfactory spectrographic determination can be made. These rare earths are separated from beryllium and magnesium by precipitation as oxalates with added thorium as ...

We discovered Balmer-lines absorption from Halpha to H9 in iron low-ionizaton broad absorption line (FeLoBAL) quasar, SDSS J172341.10+555340.5 by near-infrared spectroscopy with the Cooled Infrared Spectrograph and Camera for OHS (CISCO) attached to the Subaru telescope. The redshift of the Balmer-lines absorption ...