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Evolutionary scenario for W UMa-type stars

Published online by Cambridge University Press:  01 April 2008

K. Stepień
Affiliation:
Warsaw University Observatory, email: kst@astrouw.edu.pl
K. Gazeas
Affiliation:
Harvard-Smithsonian Center for Astrophysics, email: kgaze@physics.auth.gr
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Abstract

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An alternative to TRO model of a W UMa-type star is presented in which the binary is past mass exchange with mass ratio reversal. The secondary is hydrogen depleted and both components are in thermal equilibrium. Evolution in contact is driven by orbital angular momentum loss and mass transfer from the secondary to primary component, similarly as it is observed in Algols. Temperature equalization of both components results from an assumed energy transfer by a large scale flow encircling the whole system in the common envelope.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

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