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On the nature of the old nova CP Puppis.
O'Donoghue, D.; Wargau, W.; Warner, B. +1 more
Results are reported from nearly 48 h of high-speed photometry of the ex-nova CP Pup, obtained at Sutherland or Mount Stromlo, and 23 h of spectroscopic coverage from Sutherland, during the period 1985-88. Analysis of the photometry and radial velocities derived from the spectroscopy gives a modulation period of 0.06143 d, free from the alias prob…
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 absolute magnitudes of RR Lyrae stars - II. DX Delphini.
Jameson, R. F.; Fernley, J. A.; Lynas-Gray, A. E. +2 more
UV, IR and visual photometry of the short-period RR Lyrae star DX Del is presented and treated by means of the Blackwell and Shallis (1977) IR Flux Method-based formulation of the Baade-Wesselink method. Upon correcting to common reddening, extinction, and radial-velocity conversion factors, as well as applying the Baade-Wesselink analysis of Burk…
A comparison of solar and stellar ultraviolet spectra obtained with SKYLAB and IUE.
Pallavicini, R.; Cheng, C. C.; Cerruti-Sola, M. +1 more
A comparison is presented of 78 Short-Wavelength Primary (SWP) low-resolution IUE spectra of 45 late-type stars and 10 high-resolution Skylab spectra of spatially-resolved solar regions of various degrees of magnetic activity, including quiet areas, plage regions, and one flare. The results show that the different levels of chromospheric and trans…
Coordinated observations of a large impulsive flare on UV Ceti.
Heise, J.; van Genderen, A. M.; Waelkens, C. +16 more
The characteristics of the major flare observed on UV Ceti on Decemmber 1985 at 01:26 UT during an international observing campaign are described. X-ray observations were obtained with Exosat in the 0.06-0.3 keV bands and 1-6 keV bands; optical photometry was obtained in 11 wavelength bands, and spectra were recorded in the wavelength range 3500 t…
Studies of symbiotic stars. I. Location of the UV emitting regions in6 S-type systems monitored by the IUE satellite.
Munari, U.
IUE archive low resolution short wavelength spectra for the 6 binary symbiotic stars EG Andromedae, V1329 Cygni, AG Pegasi, CI Cygni, AX Persi, and SY Muscae are investigated to locate the regions responsible of the UV emission, both lines and continuum. It is demonstrated that, in all these S-type systems, the majority of UV emission lines and co…
Highly Ionized Stellar Winds in Be Stars. II. Winds in B6--B9.5e Stars
Shore, Steven N.; Sonneborn, George; Grady, C. A. +3 more
The results of a UV survey of stellar winds and circumstellar shells in 40 B6-B9.5e stars covering luminosity classes V-III are presented. A graph is presented of the region from 1520-1560 A, which includes both the Si II UV multiplet 2 transitions and the C IV resonance transition for selected Be stars in the sample. The detection of shortward-sh…
A 2597 : another massive cooling flow.
Fabian, A. C.; Johnstone, R. M.; Crawford, C. S. +1 more
We present X-ray, optical and ultraviolet observations of the rich cluster A2597 and confirm the presence of a central cooling flow. The intracluster gas is cooling at a rate of ~370 M_sun_ yr^-1^ and we observe extended optical line-emitting gas around the central galaxy over a radial distance of ~25 kpc. Examination of the blue continuum spectru…
A Case Study of a WC Planetary Nebula Nucleus: Henize 2-99
Feibelman, Walter A.; Shaw, Richard A.; Lutz, Julie H. +1 more
The WC spectrum of the nucleus of the planetary nebula Henize 2-99. Fluxes are given, emission lines are identified, and blends are described. The most powerful emissions are C III, C II, and C IV. O, H, and Si lines are also observed, but little stellar nitrogen is found except for N V. The interstellar extinction is estimated at c = 0.9 + or - 0…
X-ray spectroscopy of RS CVn stars with EXOSAT.
Schmitt, J. H. M. M.; Pasquini, L.; Pallavicini, R.
Results are presented of a spectral analysis of a sample of RS CVn stars which comprises all (except two) cataloged RS CVn binaries observed by Exosat. Data from both the Medium Energy and Low Energy Exosat experiments are analyzed assuming simple spectral models and the dependence of the fitted coronal parameters on the signal-to-noise ratio. Evi…