The equivalent widths of interstellar absorption lines of Mg II, P II, Cl I and II, Mn II, Fe II, Cu

The strongest and generally most useful optical interstellar absorption lines include the D lines of

Sunspot spectra of the K-line of CaII have been investigated. The K3 absorption line is seen all through the umbrae, in contrast to earlier observers, with the exception of BUMBA (1960). It is pointed out that the detection of the K3 absorption line is ra...

We do not detect Ca II H+K absorption, nor any other common absorption lines, e.g., Na D, nor any common emission lines (e.g., [O II] 3727, H alpha, H beta, ...

Apr 17, 1997 ... To determine the relative abundances of H, He I, and He II in prominences by observing absorption by these species of coronal lines observed ...

A theory of the shape of the paramagnetic resonance of conduction electron absorption is a bulk zero-gap type-II superconductor is constructed. (AIP)

Narrow interstellar absorption lines of S II 1259.52, Si II 1260.42, and Fe II 1608.46 due to gas in

Interstellar Absorption Lines and the Halo History Discoveries Relevance Klaas S de Boer Argelander Institute for Astronomy University of Bonn #12;History Huug 80 Groningen 20-21 Oct 2006 Interstellar absorption at Mt Wilson Merrill, Adams Huug 80 Groningen 20-21 Oct 2006 Interstellar absorption ...

Applying the Self Absorption Curve (SAC) method to the symbiotic binary CH Cyg, we determine the excitation temperature of the (Fe II) line formation region and that of the permitted Fe II lines. We estimate the dimensions of the Fe II line formation ...

Observations with a single-stage image tube in the 8000--9000 A range show that the absorption lines of the Ca II triplet are anomalously weak in the spectra of several UV Cet flare stars compared with standard stars. The anomaly may result from blending of the Ca II absorption ...

Strong absorption lines of previously unexplored heavy elements in Sirius are analyzed in the near-UV region. Several lines of Mo II (Z = 42), Cd II (Z = 48), W II (Z = 74), and Pb II (Z = 82) are confirmed. Detailed analyses of these ...

... G.3 Independence of Resonance Absorption on Line Shape -1 ... of a and aI in Equation (2-15 ... optically thin hydrogen plasma by machine methods for ...

The removal of the cloaking effect of telluric water vapor absorption lines in the wings of the Ha profile. (ii). To achieve the first goal the use of ...

The removal of the cloaking effect of telluric water vapor absorption lines in the wings of the. Ha profile. (ii). To achieve the first goal, ...

The discovery and preliminary spectroscopy of the broad absorption line (BAL) QSO 0059-2735 (z/em/ = 1.595), which shows features never seen before in QSO spectra, are described. In addition to very broad high-ionization troughs of C IV and Si IV, it exhibits an extensive system of low ionization absorptions which include saturated ...

High-resolution IUE spectra were analyzed in order to study the UV interstellar absorption lines, and to compare the differences between interstellar column densities, in the line of sight to AE Aur (O9.5V) and Theta-2 Ori A (O9.0V). The velocities and equivalent widths of the UV interstellar absorption ...

Pressure broadening of rotational bands. II. Water vapor from II. ABSORPTION IN THE FAR WINGS approximation. Pressure broadening of H2O lines produces, under the assumption of binary collisions, an n with temperature.5 However, it will be shown that the extreme wings of self-broadened Hp monomer resonances also

Mar 1, 2011 ... High-resolution (1-A) spectroscopy of the broad-absorption-line QSO, which fails to confirm the Ca II H and K absorption features reported ...

Mercury (II) in mercuric 5-nitrotetrazole may be determined by atomic absorption using the unique-to-mercury absorption line at 2536.5 angstroms, with a precision of 1-3%. For a precision of 0.1 to 0.6%, a titration with thiocyanate ion is recommended. Th...

Absorption lines which appear in the spectrum of SN 1987A are identified as Ba II transitions which are also observed to be strong in classical barium stars. The presence of these lines and similar Sr II transitions argues for s-process element enhancements in the supernova progenitor. The same ...

In the spectrum of the quasar PKs 2020--370 (z/sub em/ = 1.050), we find Ca II absorption lines both at near zero redshift and at z/sub abs/ = 0.02865 +- 0.00007. The latter is closely similar to the redshifts of two galaxies in the group Klemola 31, which are nearby on the plane of the sky. This observation adds to the evidence that ...

The development of practically monochromatic laser light sources has made feasible measurements of intensities and half-widths of lines in molecular absorption bands without the use of high-resolution monochromators. Laser-light absorption measurements fo...

Narrow absorption features in the IUE high dispersion spectrum of the Wolf-Rayet system HD 193077 are identified. Components in the resonance lines of Si IV, C IV, Al III, Si II, and C II at -44 km/sec with respect to the undisplaced lines are detected. I...

A general study of the effects of refraction and dispersion in the solar occultation absorption technique is described, based on the Voigt profile for the shapes of individual spectral lines. New numerical techniques are developed to evaluate both the abs...

The equivalent widths of the Mg II resonance doublet and their subordinate lines near 2800 A were determined in ten stars of spectral types A through O. Combining the current results with previously published results for four F stars, it is found that the total equivalent widths of the Mg II lines follow a pattern ...

We report on the N II ??5668-5712 emission and absorption lines in the spectrum of ? Carinae. Spectral lines of the stellar wind regions can be classified into four physically distinct categories: (1) low-excitation emission such as H I and Fe II, (2) higher-excitation He I features, (3) the N ...

The OH emission source in the direction of the H II region W48 has been observed in the 1612- and 1720-MHz satellite lines with the Nancay radio telescope. The source is located close to the intense maser emitting in the principal OH lines (1665, 1667 MHz), but does not coincide with it in space. Extended regions of OH emission and ...

We present ultraviolet spectra of the Mira AB binary system taken by the International Ultraviolet Explorer during the period from 1979 to 1995. In this study, we concentrated on the Mg II k and h emission lines arising primarily from Mira B. The broad Mg II profiles from Mira B are enhanced on the red side of the profile and obscured ...

Literature values for the equivalent width of the interstellar absorption line of Ca II K (3933 A) are used to constrain a simple empirical model for the strength of this line as a function of distance from the galactic plane. The best-fit model has an integrated Ca II K equivalent width in the ...

Repeated observations of the Seyfert 1 galaxies I Zw 1, II Zw 136 and Mk 231, which all have very strong Fe II emission lines in the optical region, were made at low resolution with the International Ultraviolet Explorer satellite. The ultraviolet spectra of I Zw 1 and II 2w 136 are very similar: both are variable ...

The H-alpha, He I 5876 A, Na I 5890 A, Ca II IR triplet, and P14-P16 Paschen lines of AB Aur are all brighter than the nearby continuum. The emission lines are examined with regard to their origin as either recombination or chromospheric emission. While He I and H-alpha could be formed simultaneously by recombination under certain ...

Absorption features identified with Mg ii, Mg i, Fe ii, and Mn ii at a redshift z=0.5240 +- 0.0001 have been detected in the optical spectrum of the BL Lacertae object AO 0235+164 during its recent outburst. An absorption doublet lambdalambda5176, 5189 cannot be identified with any likely ...

We report on the use of archival HST and FUSE data to determine the gas-phase abundances of singly-ionized magnesium (Mg II), silicon (Si II), and iron (Fe II) for 20 lines of sight. Of particular interest are the occasional detections of very weak Si II and Fe II ...

We examine variability of absorption line strength of intervening systems along the line of sight to GRB 060206 at z = 4.05, by the low-resolution optical spectra obtained by the Subaru telescope from six to ten hours after the burst. Strong variabilities of Fe II and Mg II ...

An Extended X-ray Absorption Fine Structure (EXAFS) beam line for X-ray absorption studies using energy dispersive geometry and position sensitive detector is being designed for the INDUS-II Synchrotron source. The optical design of the beam line has been completed based on the working ...

Results of studies with the 305-m telescope at Arecibo at a wavelength of 21 cm of absorption-line clouds in quasars are presented. The results include the detection of 21-cm absorption at a redshift of 1.8 in the redshift system MC3 1331+170, the detection of 21-cm absorption at a redshift of 0.4 in the redshift system PKS 1229-02 ...

We have detected five (and possibly eight) weak absorption lines in the average of 14 IDS spectra of the quasar 3C 286. These optical lines have a redshift identical to the 21 cm absorption line found by Brown and Roberts at z=692. The observed lines are identified with ...

A CCD spectroscopic survey of Mg II and Mg I absorption lines in a C IV selected sample of 35 metal systems, observed toward 12 QSOs between z = 1.1 and z = 2.1, is reported. Six Mg I and 10 Mg II absorption lines are detected in 33 C IV clouds, and some peculiarities are ...

Quasar absorption lines in flat universes with nonzero cosmological constant Lambda are examined and

... Accession Number : AD0619963. Title : INVESTIGATION OF NARROW LINE ABSORPTIONS IN SINGLE CRYSTAL CALCITE. ...

... Title : ABSORPTION LINE SERIES AND AUTOIONIZATION RESONANCE STRUCTURE ANALYSIS IN THE ULTRAVIOLET SPECTRUM OF SR I,. ...

We analyze the absorption and emission-line profiles produced by a set of simple, cool gas wind models motivated by galactic-scale outflow observations. We implement Monte Carlo radiative transfer techniques that track the propagation of scattered and fluorescent photons to generate one-dimensional spectra and two-dimensional spectral images. We focus on ...

Growth curves are constructed for solar Ti I and Ti II absorption lines using seven different sets of oscillator strengths. It is assumed that all the lines originate in the same layers of the solar atmosphere. The number of lines calculated for Ti I was four, and three ...

Observations of the QSO PKS 2126--158 (Z/sub em/=3.280) at 0.8 A resolution from 4l53 A to 6807 A reveal 113 absorption lines. There are two certain absorption-line systems at z/sub abs/=2.6381 and 2.7685, and a possible third system at z/sub abs/=2.3938. The ions H I, C II, C IV, O I, Al II, ...

MgII absorption lines detected in the spectra of background quasars allow us to probe the cool metal-enriched halo gas associated with foreground galaxies. This technique allows us to directly study the complex halo gas which provides the fuel for star-forming disks. The dynamics of this gas is likely driven by one or more of the ...

Nov 1, 1977 ... This atlas of infrared absorption line contains absorption line parameters (line strength vs.

Far-ultraviolet (FUV) observation of interstellar absorption toward the Lupus Loop region (SNR 330.0+15.0) is presented. Using Hipparcos, more accurate distance estimates to 52 B-type stars in Lupus are obtained. When a distance of 155+/-8 pc to the supernova remnant is adopted, most stars seem to lie in the foreground. Seven stars lie in the background, allowing a clearer ...

Because the FeII lines are connected by optically-thin transitions to fine-structure levels, their profiles more closely reproduce the intrinsic opacity of the wind. Together these results naturally explain the absorption and emission-line characteristics observed for star-forming galaxies at z<1. We also study ...

Monochromatic photographs were obtained in each of the sulfur lines STAS II! lambda lambda 6717, 6731 in M8 and M20 using wide slits with a medium dispersion. Observational evidence is provided for shockfront structure at bright rims in the H II regions M8 and M20, and for interaction between the ionized gas and the ...

The orbital radial velocity semi-amplitude of the binary star system LMC X-4 primary was determined to be 37.9 + or - 2.4 km/s from measurements of the hydrogen absorption lines. The semi-amplitude of the He I and He II absorption lines are consistent wit...

The possibility is considered, and shown to be plausible, that the strong C IV and Si IV absorption lines in low-resolution ultraviolet spectra of gas-rich dwarf galaxies are primarily interstellar, not stellar as has been supposed. The argument is based on analogies with H II regions in the Local Group, on low-resolution equivalent ...

Analysis of high-resolution spectra of classical barium giants reveals that an unidentified line is a major contributor to the stellar-absorption feature at 6707.8 A attributed previously to a blend of CN lines and the Li I resonance doublet. The strength of the unidentified line is well correlated with the ...

The optical absorption lines of quasars are examined, and implications of the lines for the physical

The redshifted 21-cm and Mg II absorption lines observed in the QSO 3C 286 and the BL Lacertae object 0735+178, respectively, are analyzed to determine the location of the absorbing gas. We first describe evidence which supports the presence of neutral hydrogen intrinsic to QSOs, and then examine excitation conditions ...

We study high-resolution spectra of the `overlapping-trough' low-ionization broad absorption line (LoBAL) quasar SDSS 0300+0048. The CaII, MgII and MgI column densities in SDSS 0300+0048 are the largest reported to date for any BAL outflow. The broad CaII absorption in this ...

We have used the Cerro Tololo Inter-American Observatory telescopes and spectrographs to record emission lines in ? Carinae from 3093 to 8956 � with a gap between 4432 and 5696 �. A resolving power of about 20,000 was used throughout. Accurate wavelengths, peak intensities relative to the local continuum, and line identifications are presented. The ...

IUE absorption-line data obtained at 110-320 nm with resolution 10-30 pm toward the B-star component

The competition between viscous spreading of a liquid on a substrate and its absorption by a dry porous substrate is studied in two dimensions. The effect of capillary suction into the pores vies with contact-line slip on the substrate to determine the lifetime of the drop. (c) 2000 American Institute of Physics.

emission and Ca ii H and K absorption, are expected for z > 1 galaxies. In the LRIS blue side, we used the 300 lines mm1 grating blazed at 5000 A? . ...

Detailed spectroscopic studies of Chromium in mullite ceramics are presented. An enormous broadening of absorption and emission spectra, highly nonexponential luminescence decays and luminescence line narrowing suggest a large inherent inhomogeneity of th...

The multiline and single-line amplifier performance of a two channel Helios CL II laser was studied. Flow channel aperturing of the input beam was found to cause a significant reduction in the measured amplification ratio. The absorption of the the multil...

The spectra were collected with the LRIS on the Keck II Telescope, which has a 7.7arcmin long slit. We selected galaxies from Palomar Observatory Sky Survey prints of the centre of the Coma cluster. (2 data files).

CCD photometry reveals a hot spot on the surface of the hot accretion gainer in this supergiant O type binary with a big accretion rate. This spot is as bright as 25000 Suns. The orbital period of this system is 33.108 days. The absorption-line spectrum contains multiple lines of He I, Si III and N II. The star is associated with H ...

OH) Emission lines can appear stronger due to supressed continuum In short, spectral classification is based spectral types Excitation of atomic and molecular states in thermal equilibrium: the Maxwell- Boltzmann A F G K M He II He I H I Ca II Fe I TiO Strong absorption lines: Temperature in ...

We present a composite spectrum of 60 long duration gamma-ray burst (GRB) afterglows with redshifts in the range 0.35 < z < 6.7 observed with low-resolution optical spectra. The composite spectrum covers the wavelength range 700-6600 � in the rest frame and has a mean signal-to-noise ratio of 150 per 1 � pixel and reaches a maximum of ~300 in the range 2500-3500 �. Equivalent widths ...

The orbital radial velocity semi-amplitude of the binary star system LMC X-4 primary was determined to be 37.9 + or - 2.4 km/s from measurements of the hydrogen absorption lines. The semi-amplitude of the He I and He II absorption lines are consistent with this, namely 44.9 + or - 5.0 and 37.3 ...

We present Keck spectropolarimetry of a rare ``Iron Lo- BALQSO,`` FIRST 0840+3633. The continuum is {approximately}4% polarized near 2000{Angstrom} rest-frame, but falls to {approximately}2% at longer wavelengths, and maintains a relatively constant position angle of 50{degrees}. The emission lines are unpolarized. The polarization increases up to {approximately}8% in the ...

We present an extended analysis of the high dispersion IUE spectra of SN 1993J in M 81, based on the improved data in the IUE final archive. Eight interstellar absorption components can be identified in the velocity range from -200 km s-1 to +200 km s-1. Column densities are determined for Fe Ii, Mg I, Mg Ii, O I, S ...

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 high-resolution spectra of the Na I D and Ca II K lines toward 57 late-O and early-B stars along extended (d greater than 1 kpc) low-density paths through the Milky Way disk and halo. The sight lines preferentially sample diffuse gas in the interstellar medium (ISM) along interarm, Galactic center, and high latitude ...

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 ...

The overall Fe II level population in the luminous variable stars KQ Pup and AG Car was derived using the self absorption curve method of analysis of the optical and UV Fe II emission lines. Most levels are nearly populated according to a Boltzmann-type l...

The Sloan Digital Sky Survey has discovered a population of broad absorption line quasars with various extreme properties. Many show absorption from metastable states of Fe II with varying excitations; several objects are almost completely absorbed bluewards of Mg II; at least one shows ...

MgII QSO absorption lines detected in the spectra of background QSOs were used over a decade ago to infer that all redshift z > 0.2 galaxies have gaseous halos of radius ~ 60 kpc. The actual size of the halo was believed to be proportional to the luminosity of the galaxy. However, these conclusions are now much harder to understand ...

Variable absorption features were observed in the visible and ultraviolet spectrum of beta-Pictoris soon after this star gained attention in the early 1980s due to its large IRAS infrared excess and the discovery, from optical imaging, of an edge-on dust disk. The absorption has been attributed to the evaporation of infalling planetesimals or comet-like ...

The aim of this project is to identify low-redshift host galaxies of quasar absorption-line systems by selecting galaxies that are seen in projection onto quasar sightlines. To this end, we use the Seventh Data Release of the Sloan Digital Sky Survey to construct a parent sample of 97,489 galaxy/quasar projections at impact parameters of up to 100 kpc to the foreground galaxy. ...

A fundamental astrophysical question is the role of gas in galaxy evolution. Mg II absorption as observed in quasar spectra is found to arise in a broad range of gaseous galactic environments. But the overall relationship between the distribution of Mg II absorbers, their host galaxies, and the larger scale galactic structure is not ...

In this paper, we propose a simple method to use the spectral lines which are free from self-absorption to diagnose the plasma generated from a pure Ti target. The method is based on multiplet spectral lines. Multiplets are very useful in the assessment of self-absorption, the intensity ratio of their components is ...

This publication contains information about the computer programs for the Plume Visibility Model PLUVUE II. A technical overview of PLUVUE II and the results of model evaluation studies are presented. The source code of PLUVUE II, as well as two sets of input and output data, is provided. This model is based on Gaussian dispersion ...

The findings of spectroscopic observations of several off-nuclear regions in NGC 1275 are studied with a view to their implications for hypotheses as to high-velocity emissions. The observations indicate that the high velocity gas does not exhibit a smooth gradient, but instead appears disrupted. Absorption is found from the high velocity system in the Na I D ...

This research focuses on understanding the formation and evolution of galaxies via their extended gaseous halos using the methods of quasar absorption line systems. Galaxy-absorber pairs provide direct observational constraints on competing scenarios aimed at establishing the role of gas in galaxy formation and evolution. Our sample consists of 40 ...

New photoelectric detections of irterstellar Ca I absorption in 10 stars, combined with new and existing Ca II data, yield an average Ca I to Ca II ratio of 6.2 x 10/sup -3/. It is argued that the Ca I lines and most, if not all, the Ca II lines are formed in ...

Aims: Supernova remnant (SNR) RX J0852.0-4622 is one of the youngest and is most likely the closest among known Galactic SNRs. It was detected in X-rays, the 44Ti ?-line, and radio. We obtain and analyze medium-resolution spectra of 14 stars in the direction towards the SNR RX J0852.0-4622 in an attempt to detect broad absorption lines ...

The discovery of linear polarization changes across the extended wings of He II lines, mainly the strong 4-3 transition at 4686 A, in the WN5 star EZ CMa, is reported. When the polarization across the line profiles is plotted in the Stokes parameters plane, it traces loops clockwise from the blue wing through line ...