Search Publications
The HST Quasar Absorption Line Key Project. IV. HST Faint Object Spectrograph and Ground-based Observations of the Unusual Low-Redshift Broad Absorption Line Quasi-stellar Object PG 0043+039
Turnshek, David A.; Schneider, Donald P.; Savage, Blair D. +10 more
HST FOS observations have shown that the spectrum of the low-redshift (z_em_ ~ 0.384) QSO PG 0043+039 exhibits weak broad absorption lines (BALs). The BALs were discovered during the course of UV spectrophotometry made for the HST Quasar Absorption Line Key Project. The HST data are analyzed along with ground-based optical and IUE spectrophotometr…
Multiwaveband study of a major X-ray outburst from the Be/X-ray transient system A 1118-616.
Fishman, G. J.; Coe, M. J.; Buckley, D. A. H. +10 more
The Be/X-ray binary system A 1118-616 has been observed to undergo a major outburst in January 1992 by the BATSE all-sky monitor on the Compton Gamma Ray Observatory. Ground-based optical and IR observations, supported by UV observations obtained under an IUE Target of Opportunity programme, have provided us with an excellent multi-wavelength stud…
New HST observations of the core of R Aquarii I. Imaging.
Paresce, Francesco; Hack, Warren
The inner region of the symbiotic system R Aquarii was imaged with the Faint Object Camera on the Hubble Space Telescope (HST) in order to determine the source and structure of the highly collimated bipolar jet near the central Mira variable. Coverage over both a wide wavelength and temporal range was ensured by exposures through narrow and medium…
Hubble Space Telescope Observations of the Distant Cluster CL 0016+16: Quantitative Morphology of Confirmed Cluster Members
Koo, David C.; Wirth, Gregory D.; Kron, Richard G.
We present Hubble Space Telescope (HST) images of 24 confirmed members of the distant galaxy cluster Cl 0016+16 at redshift 0.55. The Balmer- strong ("E + A") and emission-line galaxies frequently show unusual visual morphology, implying that galaxian interactions produce "active" galaxies in moderate-redshift clusters. We use an image concentrati…
An Atlas of Ultraviolet P Cygni Profiles
Snow, Theodore P.; Lamers, Henny J. G. L. M.; Lindholm, Douglas M. +1 more
We have selected spectra of 232 stars from the International Ultraviolet Explorer (IUE) archives for inclusion in an atlas intended for various uses but tailored especially for the study of stellar winds. The atlas covers the range in spectral types from O3 to F8. The full atlas covers the reduced and normalized high resolution spectra from the IU…
Elemental abundances in normal late-B and HgMn stars from co-added IUE spectra. III. Copper and zinc.
Smith, K. C.
Atmospheric abundances of copper and zinc are derived for a sample of 40 normal, superficially normal, and HgMn-type main-sequence late-B stars by LTE spectrum-synthesis analysis of co-added high-resolution International Ultraviolet Explorer (IUE) spectra. In the normal and superficially normal stars, the abundances of these elements are generally…
A Search for the Radio Counterpart to the 1994 March 1 Gamma-Ray Burst
Cline, T.; Frail, D. A.; Kulkarni, S. R. +7 more
We report on the results of a search for the radio counterpart to the bright γ-ray burst of 1994 March 1. Using the Dominion Radio Astrophysical Observatory Synthesis Telescope sensitive, wide-field radio images at 1.4 GHz and 0.4 GHz were made of a region around GRB 940301. A total of 15 separate radio images were obtained at each frequency, samp…
Ammonia in comet P/Halley.
Eberhardt, P.; Meier, R.; Krankowsky, D. +1 more
In comet P/Halley the abundances of ammonia relative to water reported in the literature differ by about one order of magnitude from roughly 0.1% up to 2%. Different observational techniques seem to have inherent systematic errors. Using the ion mass channels m/q=19amu/e, 18amu/e and 17amu/e of the Neutral Mass Spectrometer experiment aboard the s…
The Spectrum of the Planetary Nebula IC 418
Feibelman, Walter A.; Hyung, Siek; Aller, Lawrence H.
A detailed high spectral resolution study of the spectrum of IC 418 is made for the region 3650A to 10050A, using the Hamilton echelle spectrograph of Lick Observatory, and of the UV spectral region with archival International Ultraviolet Explorer (IUE) data. From the high resolution images in both the near- and mid-infrared, Hora et al. (1993) sh…
Hubble Space Telescope observations of the BL Lac object PKS 1413+135 : the host galaxy revealed.
Abraham, R. G.; McHardy, I. M.; Crawford, C. S. +1 more
In an earlier paper, we showed that the BL Lac object PKS 1413 + 135 appears to lie in a disc-dominated galaxy with colours closer to those of an elliptical than a spiral galaxy. Subsequently, a large neutral hydrogen absorption feature was found at the optical redshift of the proposed host galaxy together with a substantial absorbing column in th…