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Structure and evolution of W UMa-type systems

Published online by Cambridge University Press:  01 April 2008

Lifang Li ,
Fenghui Zhang ,
Zhanwen Han ,
Dengkai Jiang  and
Tianyu Jiang
Lifang Li
Affiliation:
National Astronomical Observatories Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming, Yunnan Province, 650011, P.R. China email: gssephd@public.km.yn.cn .or. llf@ynao.ac.cn
Fenghui Zhang
Affiliation:
National Astronomical Observatories Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming, Yunnan Province, 650011, P.R. China email: gssephd@public.km.yn.cn .or. llf@ynao.ac.cn
Zhanwen Han
Affiliation:
National Astronomical Observatories Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming, Yunnan Province, 650011, P.R. China email: gssephd@public.km.yn.cn .or. llf@ynao.ac.cn
Dengkai Jiang
Affiliation:
National Astronomical Observatories Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming, Yunnan Province, 650011, P.R. China email: gssephd@public.km.yn.cn .or. llf@ynao.ac.cn Graduate University of Chinese Academy Sciences, Beijing 100039, China
Tianyu Jiang
Affiliation:
National Astronomical Observatories Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming, Yunnan Province, 650011, P.R. China email: gssephd@public.km.yn.cn .or. llf@ynao.ac.cn Graduate University of Chinese Academy Sciences, Beijing 100039, China
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Abstract

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We summarize and discuss our recent works on the structure and evolution of low-mass W UMa-type contact binary stars. Three conclusions are given as followings: (1) The energy transfer is taken place in the radiative region of common envelope of W UMa systems; (2) The magnetic activity level of W UMa systems is weaker than that of non-contact binaries or rapid-rotating single stars; (3) The evolutionary outcome of W UMa systems might be the rapid-rotating single stars, and an average lifetime is derived to be about 7 Gyr for W UMa systems.

Keywords

binaries: closestars: evolutionstars: rotationstars: activity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S252: The Art of Modeling Stars in the 21st Century , April 2008 , pp. 423 - 424
Copyright
Copyright © International Astronomical Union 2008

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