On the evolutionary state of the W Ursae Majoris contact binaries

Details On the evolutionary state of the W Ursae Majoris contact binaries On the evolutionary state of the W Ursae Majoris contact binaries

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...105..389v&link_type=abstract

Astronomy and Astrophysics, vol. 105, no. 2, Jan. 1982, p. 389-394.

Astronomy and Astrophysics

Astrophysics

26

A Stars, Eclipsing Binary Stars, Main Sequence Stars, Stellar Evolution, Mass Ratios, Stellar Mass

Scientific paper

The observed spectral type of 17 A-type and 14 W-type W Uma binaries are compared with the expected type when their primary components are normal main sequence objects. For both groups the observed spectral type appears on average to be shifted towards the later spectral types. This shift corresponds to an excess of the mass and radius of the primary components with respect to the main sequence mass and radius in conformity with their observed spectral type. It is argued that neither for the W- nor all the A-type systems this excess should be explained as the result of a normal nuclear evolution of the system.

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