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Chromospherically Active Stars Ix Hd 33798 = V390 Aurigae: A Lithium-Rich Rapidly Rotating Single Giant, Francis C. Fekel, Laurence A. Marschall
Chromospherically Active Stars Ix Hd 33798 = V390 Aurigae: A Lithium-Rich Rapidly Rotating Single Giant, Francis C. Fekel, Laurence A. Marschall
Physics and Astronomy Faculty Publications
HD 33798 is a chromospherically active, rapidly rotating, lithium-rich, late-type giant. Analysis of 40 radial velocities indicates no periodic velocity variations, suggesting that the star is single, so its rapid rotation (v sin i = 29 km s-1) is highly unusual. Such rotation is inconsistent with the rotational brake hypothesis of Gray [ApJ, 262, 682 (1982); 347, 1021 (1989)] and the results of Rutten & Pylyser [A&A, 191, 227 (1988)]. Although there are many similarities to the supposed pre-main-sequence star HDE 283572, the lithium abundance and space motion of HD 33798 appears to be in a post-main-sequence phase of …
Photometry Of The Chromospherically Active Binary Hd 197010, Laurence A. Marschall, Harold L. Nations, B. W. Taylor, T. L. Huard
Photometry Of The Chromospherically Active Binary Hd 197010, Laurence A. Marschall, Harold L. Nations, B. W. Taylor, T. L. Huard
Physics and Astronomy Faculty Publications
For the past several years we have been conducting a study of the spectroscopic and photometric characteristics of a sample X-ray emitting stars from the Einstein Observatory Medium Sensitivity Survey identified as probable binary systems by Fleming (1988) and Fleming, et al.(1989). One of these stars, HD 197010 ( = 1E2038.3-0046 = SAO 144692 = BD -1degree 4025) was discovered to be a short period eclipsing binary by Robb, et al.(1990). The ephemeris he presented was based on observations in 1989 and 1990, but only the 1990 observations included points at eclipse minimum. We report here on first results of …