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IUE Observations of the Interstellar Medium toward beta Geminorum
Moos, H. W.; Murthy, J.; Linsky, J. L. +4 more
A dispersion IUE spectrum of the hydrogen Ly-alpha emission line of the nearby late-type star Beta Gem is presented. Values are determined for the density, velocity, dispersion, and bulk velocity of the interstellar H I toward the star, showing agreement with previous IUE results for stars in the same general direction (Murthy et al., 1987). It is…
Analysis of the Velocity Law in the Wind of the Be Star lambda Pavonis
Sahade, Jorge; Kondo, Yoji; Chen, Haiqi +1 more
This paper reanalyzes the IUE spectra of Lambda Pavonis secured in 1982 (Sahade et al.). It is found that the profiles of the broad UV lines are either rotationally broadened or nonrotationally broadened and that the rotationally broadened profiles can be sorted out in two groups characterized by rotational velocity values of 170 km/s and of 210 k…
Galactic Interstellar Abundance Surveys with IUE. III. Silicon, Manganese, Iron, Sulfur, and Zinc: Erratum
Shull, J. Michael; van Steenberg, Michael E.
Sanduleak's Star (LMC Anonymous): Its Similarity in the Far-Ultraviolet with the Luminous Object eta Carinae and SN 1987A
Kafatos, M.; Michalitsianos, A. G.; Shore, S. N.
Spectra obtained in the far UV wavelength range 1200-2000 A with the International Ultraviolet Explorer (IUE) of the peculiar emission object LMC Anonymous, or Sanduleak's Star in the Large Magellanic Cloud, indicate the presence of circumstellar-high-excitation gas, which is rich in CNO processed material. Although LMC Anonymous is a field star w…
A New Narrow-Line Seyfert 1 Galaxy: IRAS 1652+395
Malkan, M. A.; Mandolesi, N.; Partridge, B. +3 more
Multiwavelength observations--from radio to X-rays--of IRAS 1652+395, a far-infrared and X-ray source serendipitously discovered in the field of the BL Lac object Mrk 501, are reported. They show that IRAS 1652+395 is a new Seyfert 1 galaxy at a redshift of z = 0.069. The Balmer emission lines are only slightly broader (~ 1000 km s^-1^ FWHM) than …
An Interpretation of the Line Profile Variations in the IUE Spectrum of the Wolf-Rayet Binary gamma 2 Velorum: Erratum
Sahade, Jorge; Brandi, Estela; Ferrer, Osvaldo
The Far-Ultraviolet Spectra of Early-Type Galaxies
Lauer, Tod R.; Faber, S. M.; Burstein, David +2 more
New and revised ultraviolet erergy distributions are presented based on 97 IUE spectra of 31 early-type galaxies and the bulge of M31. Measurements of the line strength index Mg_2_ and the V magnitude flux with the IUE aperture are included. The average flux between 1250 and 1850 A is combined with the V magnitude to form an ultraviolet/optical (1…
The X-Ray Spectral Properties of Accretion Disks in X-Ray Binaries
Stella, L.; Parmar, A. N.; White, N. E.
Using EXOSAT observations, the spectral properties of the persistent emission from a number of X-ray burst sources, high-luminosity low-mass X-ray binaries (LMXRB), and galactic black hole candidates are compared with various models for X-ray emission from an accretion disk surrounding a compact object in a binary system. These models include the …
Galactic Evolution and Cosmology: Probing the Cosmological Deceleration Parameter
Takahara, Fumio; Yoshii, Yuzuru
The magnitude-redshift relation, the color-redshift relation, the galaxy number count, the redshift distribution of galaxies, and the extragalactic background light are calculated taking into account the effect of galactic evolution for several values of the cosmological deceleration parameter q_0_ and the redshift of galaxy formation z_F_. The sp…
An Analysis of the Shapes of Ultraviolet Extinction Curves. II. The Far-UV Extinction
Fitzpatrick, Edward L.; Massa, Derck
In this paper we examine the properties of interstellar extinction in the far-ultraviolet region (FUV; λ < 1700 A) utilizing IUE extinction curves for a primary data sample of 45 reddened Milky Way OB stars. These results are combined with those derived for the 2175 A bump in a previous study. We find that IUE extinction curves can be represent…