NDLI: Chromospherically active stars. 6: giants with compact hot companions and the barium star scenario

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Chromospherically active stars. 6: giants with compact hot companions and the barium star scenario

Content Provider	NASA Technical Reports Server (NTRS)
Author	Busby, Michael R. Henry, Gregory W. Fekel, Francis C. Eitter, Joseph J.
Copyright Year	1993
Description	We have determined spectroscopic orbits for three chromospherically active giants that have hot compact companions. They are HD 160538 (K0 III + wd, P = 904 days), HD 165141 (G8 III + wd, P approximately 5200 days), and HD 185510 (K0 III + sdB, P = 20.6619 days). By fitting an IUE spectrum with theoretical models, we find the white dwarf companion of HD 165141 has a temperature of about 35000 K. Spectral types and rotational velocities have been determined for the three giants and distances have been estimated. These three systems and 39 Ceti are compared with the barium star mass-transfer scenario. The long-period mild barium giant HD 165141 as well as HD 185510 and 39 Ceti, which have relatively short periods and normal abundance giants, appear to be consistent with this scenario. The last binary, HD 160538, a system with apparently near solar abundances, a white dwarf companion, and orbital characteristics similar to many barium stars, demonstrates that the existence of a white-dwarf companion is insufficient to produce a barium star. The paucity of systems with confirmed white-dwarf companions makes abundance analyses of HD 160538 and HD 165141 of great value in examining the role of metallicity in barium star formation.
File Size	1583755
Page Count	42
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950024045
Archival Resource Key	ark:/13960/t2z36r248
Language	English
Publisher Date	1993-01-01
Access Restriction	Open
Subject Keyword	Astrophysics Stellar Spectra Barium Chromosphere White Dwarf Stars Ultraviolet Spectra Astronomical Spectroscopy Abundance Mass Transfer Metallic Stars Giant Stars Star Formation Stellar Mass Metallicity Astronomical Models Iue Companion Stars Ultraviolet Astronomy Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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