Search Publications
Geometry and Physical Conditions in the Stellar Wind of AG Carinae
Drissen, Laurent; Robert, Carmelle; Leitherer, Claus +8 more
AG Carinae is one of the prototypes of the class of Luminous Blue Variables (LBVs). Since 1990 the star has continuously brightened in its visual continuum. We report on a multi-instrument and -wavelength observing campaign to monitor the current activity phase of AG Car. Ground-based photometry, polarimetry, spectroscopy, and space-ultraviolet sp…
The Hubble Space Telescope Quasar Absorption Line Key Project. VI. Properties of the Metal-rich Systems
Turnshek, David A.; Petitjean, Patrick; Schneider, Donald P. +10 more
We present an analysis of the properties of a sample of 18 metal-rich, low-redshift z_abs_ < z_em_ absorbers seen in low- and medium-resolution spectra obtained for the Quasar Absorption Line Key Project with the Hubble Space Telescope Faint Object Spectrograph. For most of the C IV and Lyman-limit systems, observations in the optical wavelengt…
HST Ultraviolet Spectropolarimetry of NGC 1068
Antonucci, Robert; Hurt, Todd; Miller, Joseph
We present multiaperture spectropolarimetric observations of the Seyfert 2 galaxy NGC 1068. The nuclear region of NGC 1068 was observed with three apertures 4.3" x 1.4", 1.0" and 0.3") by the Hubble Space Telescope. These ultraviolet data allow us to study the scattered, nuclear light without the complication of polarization dilution caused by str…
Detection of CO Cameron Band Emission in Comet P/Hartley 2 (1991 XV) with the Hubble Space Telescope
Feldman, P. D.; A'Hearn, M. F.; Weaver, H. A. +3 more
Ultraviolet (UV) spectra of comet P/Hartley 2 (1991 XV) taken with the Faint Object Spectrograph (FOS) on the Hubble Space Telescope (HST) in 1991 September reveal several bands of the Cameron system of CO (a 3 Pi-X 1 Sigma). These band are most likely due to 'prompt' emission from CO2 and, thus, provide a direct tracer of the CO2 abundance in the…
The Ultraviolet Emission Properties of Five Low-Redshift Active Galactic Nuclei at High Signal-to-Noise Ratio and Spectral Resolution
Laor, Ari; Schneider, Donald P.; Green, Richard F. +3 more
We analyze the ultraviolet (UV) emission line and continuum properties of five low-redshift active galactic nuclei (four luminous quasars: PKS 0405 - 123, H1821 +643, PG 0953+414, and 3C 273, and one bright Seyfert 1 galaxy: Mrk 205). The HST spectra have higher signal-to-noise ratios (typically ~60 per resolution element) and spectral resolution …
HST Images of Very Compact Blue Galaxies at Z approximately 0.2
Bershady, Matthew A.; Majewski, Steven R.; Koo, David C. +2 more
We present the results of HST Wide-Field Camera (WFC) imaging of seven very compact, very blue galaxies with B <= 21 and redshifts z ~ 0.1 to 0.35. Based on deconvolved images, we estimate typical half-light diameters of ~0.65", corresponding to ~1.4 h^-1^ kpc at redshifts z~0.2. The average rest frame surface brightness within this diameter is…
HD 129333: The Sun in Its Infancy
Guinan, Edward F.; Dorren, J. David
HD 129333 is a remarkable young, nearby solar-type G star which offers a unique opportunity of studying the properties of the Sun at a time very shortly after in arrived on the main sequence. Its space motion suggest that it is a member of the Pleiades moving group, with an age of approximately 70 Myr; its lithium abundance is consistent with this…
Galaxies with Extreme Infrared and Fe II Emission. II. IRAS 07598+6508: A Starburst/Young Broad Absorption Line QSO
Lipari, Sebastian
In this paper we investigate the nuclear properties of the extreme IR- Fe II emitters IRAS 07598+6508 by means of UV-optical spectroscopy, and IR photometry. The features shown in the UV region (by the IUE spectrum of IRAS 07598+6508) are very similar to those obtained for high-redshift low-ionization BAL QSOs (i.e., they show a strong blend of br…
Tomographic Separation of Composite Spectra. II. The Components of 29 UW Canis Majoris
Wiggs, Michael S.; Gies, Douglas R.; Bagnuolo, William G., Jr. +2 more
We have analyzed the UV photospheric lines of 29 CMa, a 4.39 day period, double-lined O-type spectroscopic binary. Archival data from International Ultraviolet Explorer (IUE)(28 spectra well distributed in oribital phase) were analyzed with several techniques. We find that the mass ratio is q = 1.20 +/- 0.16 (secondary more massive) based on three…
The Abundance of Interstellar Oxygen toward Orion: Evidence for Recent Infall?
Meyer, David M.; Jura, M.; Cardelli, Jason A. +1 more
We present high S/N (greater than 800) Goddard High-Resolution Spectrograph (GHRS) observations of the weak interstellar O I lambda 1356 absorption in the low-density sight lines toward iota Ori and kappa Ori. By comparing these data with observations toward more reddened stars, we find no evidence of density-dependent depletion from the gas phase…