Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231..341h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, March 15, 1988, p. 341-352.
Astronomy and Astrophysics
Astronomy
120
Astrometry, Astronomical Catalogs, Binary Stars, Stellar Evolution, Radii, Roche Limit, Stellar Luminosity, Stellar Mass
Scientific paper
A compilation is presented of the masses, radii, and luminosities of the components of 31 F-K type binary systems which have been found to be in contact or near-contact states. Comparisons of these data with those expected for single stars demonstrates that: (1) the primary components of the shallow-contact W-type WUMa systems are unevolved main-sequence stars, while those of the deeper-contact A-type systems are near to the terminal-age main sequence; (2) the secondary components of the W-type systems have radii of the order of 1.5 times larger than expected for their ZAMS masses, while those of the A-type systems have radii of the order of three times larger; (3) the nine systems in the sample which do not display EW-type light curves can be divided into three marginal contact systems, five semidetached systems, and one detached system. The implications of these findings for the types of evolution into contact are addressed.
Hilditch Ron W.
King J. D.
McFarlane T. M.
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