Search Publications
Astrometry with Hubble Space Telescope Fine Guidance Sensor 3: The Parallax of the Cataclysmic Variable RW Triangulum
McArthur, B. E.; Benedict, G. F.; Girard, T. +12 more
RW Triangulum (RW Tri) is a 13th magnitude nova-like cataclysmic variable star with an orbital period of 0.2319 days (5.56 hr). Infrared observations of RW Tri indicate that its secondary is most likely a late-K dwarf (Dhillon). Past analyses predicted a distance of 270 pc, derived from a blackbody fit to the spectrum of the central part of the di…
Hubble Space Telescope Images of Magellanic Cloud Planetary Nebulae: Data and Correlations across Morphological Classes
Barlow, M. J.; Blades, J. C.; Liu, X. -W. +2 more
The morphology of planetary nebulae (PNs) provides an essential tool for understanding their origin and evolution, since it reflects both the dynamics of the gas ejected at the tip of the asymptotic giant branch phase and the central-star energetics. Here we study the morphology of 27 Magellanic Cloud planetary nebulae (MCPNs) and present an analy…
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…