Evolutionary Status of Late-type Contact Binaries: Case of a 1.2+1 M ⊙ Binary |
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Authors: | Kazimierz Stępień |
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Affiliation: | (1) Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland |
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Abstract: | 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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Keywords: | Contact binaries Stellar activity Evolution of binary stars |
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