Evolutionary Status of Late-type Contact Binaries: Case of a 1.2+1 M &sun; Binary

Details Evolutionary Status of Late-type Contact Binaries: Case of a 1.2+1 M &sun; Binary Evolutionary Status of Late-type Contact Binaries: Case of a 1.2+1 M &sun; Binary

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ap%26ss.304...81s&link_type=abstract

Astrophysics and Space Science, Volume 304, Issue 1-4, pp. 81-84

Astronomy and Astrophysics

Astrophysics

Contact Binaries, Stellar Activity, Evolution Of Binary Stars

Scientific paper

It is argued that typical W UMa-type stars are old, advanced evolutionary objects, similar to Algols, in the sense that they are past mass exchange resulting in a mass ratio inversion. Their secondaries are oversized due to depletion of hydrogen, and in many cases they possess small helium cores. An alternative evolutionary scenario leading to such a configuration is presented. Differences between the evolution of binaries with the initial mass ratio far and close to unity are discussed.

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