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The hot subdwarf in the eclipsing binary HD 185510High-resolution spectroscopic measurements of radial velocity are employed to characterize the eclipsing binary HD 185510 in terms of masses and evolutionary status. The IUE is used to obtain the radial velocities which indicate a large mass ratio Mp/Ms of 7.45 +/- 0.15, and Teff is given at 25,000 +/- 1000 K based on Ly alpha and UV spectrophotometry. Photometric observations are used to give an orbital inclination of between 90 and 70 deg inclusive, leading to masses of 0.31-0.37 and 2.3-2.8 solar mass for the hot star and the K star, respectively. The surface gravity of HD 185510B is shown to be higher than those values for sdB stars suggesting that the object is a low-mass white dwarf that has not reached its fully degenerate configuration. The object is theorized to be a low-mass helium main-sequence star or a nascent helium degenerate in a post-Algol system.
Document ID
19920074057
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jeffery, C. S.
(St. Andrews, University United Kingdom)
Simon, Theodore
(Hawaii, University Honolulu, United States)
Evans, T. L.
(South African Astronomical Observatory Observatory, South Africa)
Date Acquired
August 15, 2013
Publication Date
September 1, 1992
Publication Information
Publication: Royal Astronomical Society, Monthly Notices
Volume: 258
Issue: 1 Se
ISSN: 0035-8711
Subject Category
Astrophysics
Accession Number
92A56681
Funding Number(s)
CONTRACT_GRANT: NAG5-146
Distribution Limits
Public
Copyright
Other

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