Search Publications
Ultraviolet Fluxes for Globular Clusters in M31: A Rediscussion
Crotts, Arlin P. S.; Cacciari, Carla; Kron, Richard G. +1 more
We discuss long-exposure observations of three bright globular clusters in M31 obtained with both the short- and long-wavelength low-resolution cameras of the International Ultraviolet Explorer satellite. All of the clusters are seen at the longer wavelengths, but only one of the clusters is seen at short wavelengths, and this detection is margina…
The Long Period Binary AL Velorum: The Atmospheric Eclipse of a Bright KO Giant
Shore, Steven N.; Kondo, Yoji; Eaton, Joel A. +1 more
The properties of the AL Vel binary system, a Zeta Aur system containing a B dwarf and a bright K0 giant, are reviewed with reference to IUE observations of its atmospheric eclipse and eclipse of the accretion disk around the B-dwarf component. It is found that the conditions in the chromosphere are rather similar to those in the Zeta Aur supergia…
FG Sagittae: No Hot Companion?
Feibelman, Walter A.; Bruhweiler, Frederick C.
The nucleus of the planetary nebula He 1-5 (= PK 60 -7 deg 1), the variable star FG Sge, was observed with the SWP camera of the International Ultraviolet Explorer satellite to detect a hot companion of the star, if such a companion exists. The observation found no evidence for the existance of a hot companion in the 1200-2000 A range of the SWP c…
The Hot DOA1 Degenerate HZ 21: A Search for Circumstellar/Photospheric Metals and Peculiar Absorption at He II
Sion, E. M.; Vauclair, G.; Liebert, J. +2 more
A high-resolution IUE spectrum of the hot DO1 degenerate HZ 21 was obtained by combining US1 + European 2 low-background observing shifts. The SWP image reveals a rich spectrum of interstellar absorption lines with an average velocity in the line of sight to HZ 21 of -30 km/s. However, there is no clear evidence of any highly or lowly ionized meta…
The First UV Spectrum of a Uranian Satellite: IUE Observations of Oberon from 2650-3200 A
Buratti, B. J.; Stern, S. A.; Festou, M. C. +1 more
Using the International Ultraviolet Explorer (IUE) observatory, the first vacuum UV spectrum of Oberon was obtained. The data contain useful information in the spectral range 2650-3200 A. Oberon's UV geometric albedo is found to be flat and essentially featureless with an average value of p(UV) = 0.19 + or - 0.025, and making it possible to extend…
On the Nature of the Symbiotic Star BF Cygni
Kenyon, S. J.; Mikolajewska, J.; Mikolajewski, M.
Optical and ultraviolet spectroscopy of the symbiotic binary BF Cyg obtained during 1979-1988 is discussed. This system consists of a low-mass M5 giant filling about 50 percent of its tidal volume and a hot, luminous compact object similar to the central star of a planetary nebula. The binary is embedded in an asymmetric nebula which includes a sm…
Eclipsing Binary Stars as Tests of Gravity Theories: The Apsidal Motion of AS Camelopardalis
Guinan, Edward F.; Boyd, Patricia T.; Maloney, Frank P.
AS Camelopardalis is an 8th-magnitude eclipsing binary that consists of two main-sequence (B8 V and a B9.5 V) components in an eccentric orbit (e = 0.17) with an orbital period of 3.43 days. Like the eccentric eclipsing system DI Herculis, and a few other systems, AS Cam is an important test case for studying relativistic apsidal motion. In these …
The High-Resolution Spectrum of the Pulsating, Pre-White Dwarf Star PG 1159-035 (GW Vir)
Husfeld, D.; Sion, E. M.; Wesemael, F. +3 more
High-resolution and low-resolution UV spectra and a high-resolution optical spectrum were obtained for PG 1159-035, revealing apparent photospheric absorption features with defined cores from N V 1240 A, N IV 1270 A, O V 1371 A, and C IV 1550 A. The photospheric velocity derived using all of these lines except for C IV is about +35 km/s. Equivalen…
The Binary Companion of the Classical Cepheid AW Per
Evans, Nancy Remage
An analysis of IUE spectra of the companion of AW Per shows it to be an extreme BpSi/HeW star with a spectral type of B7 V to B8 V. The flux of the composite spectrum from 1200 A through V is found to be well matched by F7 Ib and B8 V standard stars with Delta M(V) = 3.1 mag. The results suggest that the mass of the Cepheid must be greater than 4.…
Chromospherically Active Stars. VI. HD 136901 = UV CrB: A Massive Ellipsoidal K Giant Single-Lined Spectroscopic Binary
Kirkpatrick, J. Davy; Fekel, Francis C.; Strassmeier, Klaus G. +1 more
The variable star HD 136901 = UV CrB is a chromospherically active K2 III single-lined spectroscopic binary with an orbital period of 18.665 days. It has modest-strength Ca H and K emission and UV features, while H-alpha is a strong absorption feature containing little or no emission. The inclination of the system is 53 + or - 12 deg. The v sin i …