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The composite nature of the peculiar star HR 6560 (HD 159870)Ground-based high-dispersion photographic spectra and ultraviolet spectra obtained with the IUE satellite are described and employed to determine the nature of the peculiar star HR 6560 (HD 159870). Previously this object had been described as both a composite system and as a strong Fm star. The UBVRI, Stromgren, and ultraviolet colors of HR 6560 are compared with objects classified composite from the Bright Star Catalogue and normal dwarfs and giants. The colors of HR 6560 are not unusual for a composite and are consistent with a late-A dwarf, combined with a late-G or early-K giant. The ultraviolet satellite clearly shows the presence of an A component, but its precise spectral type is difficult to assign. The IUE and TD-1 data suggest that the ultraviolet is dominated by light from an A5 V secondary and the visual from a GO III primary. This does not agree well with the most plausible model that fits the visual photometry. The peculiar nature of HR 6560's spectrum is most likely due to its composite nature.
Document ID
19920057094
Document Type
Reprint (Version printed in journal)
Authors
Wegner, Gary
(Dartmouth College Hanover, NH, United States)
Cowley, Charles R.
(Michigan, University Ann Arbor, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1992
Publication Information
Publication: Astronomical Society of the Pacific, Publications
Volume: 104
Issue: 675
ISSN: 0004-6280
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-287
CONTRACT_GRANT: NSF AST-85-15219
Distribution Limits
Public
Copyright
Other
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