Search Publications
The Discovery of Two New Bipolar Proto-Planetary Nebulae: IRAS 16594-4656 and IRAS 17245-3951
Kwok, Sun; Hrivnak, Bruce J.; Su, Kate Y. L.
We report the discovery of two new, bipolar proto-planetary nebulae (PPNs). Both are cool IRAS sources for which we have confirmed optical counterparts by our 10 µm observations. Ground-based visible and infrared photometry was combined with the IRAS photometry and spectroscopy to produce their spectral energy distributions (SEDs). These SED…
The Luminosity Function of M3
Carretta, E.; Buonanno, R.; Ferraro, F. R. +6 more
We present a high-precision, large-sample luminosity function (LF) for the Galactic globular cluster M3. With a combination of ground-based and Hubble Space Telescope data we cover the entire radial extent of the cluster. The observed LF is well fitted by canonical standard stellar models from the red giant branch (RGB) tip to below the main-seque…
The Abundance of Interstellar Tin and Cadmium
Sofia, Ulysses J.; Meyer, David M.; Cardelli, Jason A.
We have determined the gas-phase interstellar abundance of the dominant ions of tin and cadmium (Sn II and Cd II) in the diffuse clouds toward 14 and 5 stars, respectively. Our measurements show that tin is exchanged between the gas and dust phases of the diffuse interstellar medium, while cadmium is not. The sight lines showing the highest gas-ph…
Far-Ultraviolet Space Telescope Imaging Spectrometer Spectra of the White Dwarf REJ 1032+532. I. Interstellar Line of Sight
Barstow, M. A.; Bruhweiler, F. C.; Holberg, J. B. +1 more
An 1150-1725 Å echelle spectrum of the hot DA white dwarf REJ 1032+532, recently obtained with the Space Telescope Imaging Spectrometer E140M grating, reveals numerous stellar and interstellar lines. The interstellar column densities and abundances of C, N, O, Si, and S relative to the directly measured H column are determined for this particular …
Dust in the Ionized Medium of the Galaxy: GHRS Measurements of AL III and S III
Savage, Blair D.; Howk, J. Christopher
We present interstellar absorption-line measurements of the ions S III and Al III toward the stars β1 Sco, µ Col, ξ Per, ζ Oph, ρ Leo, and HD 18100 using archival data from the Goddard High-Resolution Spectrograph on board the Hubble Space Telescope. The ions Al III and S III trace heavily depleted and nondepleted elements, respec…
Masses and Other Parameters of the Post-Common Envelope Binary BE Ursae Majoris
Napiwotzki, Ralf; Liebert, James; Ferguson, Donald H. +2 more
The binary star BE Ursae Majoris is recently emerged from the common envelope phase; indeed, the hot sdO/DAO component is the central star of the associated planetary nebula. As such, BE UMa represents an important test case of stellar evolution theory. Using the Hubble Space Telescope (HST) Goddard High Resolution Spectrograph (GHRS), we measured…
PKS 1004+13: A High-Inclination, Highly Absorbed Radio-loud QSO--the First Radio-loud Broad Absorption Line QSO at Low Redshift?
Brandt, W. N.; Laor, A.; Wills, Beverley J.
The existence of broad absorption line (BAL) outflows in only radio-quiet QSOs was thought to be an important clue to mass ejection and the radio-loud-radio-quiet dichotomy. Recently, a few radio-loud BAL QSOs have been discovered at high redshift. We present evidence that PKS 1004+13 is a radio-loud BAL QSO. It would be the first known at low red…
Precise Interplanetary Network Localization of a New Soft Gamma Repeater, SGR 1627-41
Cline, T.; Hurley, K.; Kouveliotou, C. +5 more
We present Ulysses, Konus-Wind, and BATSE observations of bursts from a new soft gamma repeater that was active in 1998 June and July. Triangulation of the bursts results in a ~1.8d by 16" error box whose area is ~7.6 arcmin2 and which contains the Galactic supernova remnant G337.0-0.1. This error box intersects the position of a BeppoS…
The Three-dimensional Coronal Magnetic Field during Whole Sun Month
Thompson, B. J.; Hoeksema, J. T.; Lazarus, A. J. +11 more
Combining models and observations, we study the three-dimensional coronal magnetic field during a period of extensive coordinated solar observations and analysis known as the Whole Sun Month (WSM) campaign (1996 August 10-September 8). The two main goals of the WSM campaign are addressed in this paper, namely, (1) to use the field configuration to…
Multiwavelength Study of the Starburst Galaxy NGC 7714. I. Ultraviolet-Optical Spectroscopy
Leitherer, Claus; Pasquali, Anna; González Delgado, Rosa M. +2 more
We have studied the physical conditions in the central 300 pc of the prototypical starburst galaxy NGC 7714. Our analysis is based on ultraviolet spectroscopy with the HST/GHRS and ground-based optical observations, and it also covers X-ray and radio data taken from the literature. The data are interpreted using evolutionary models optimized for y…