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Some Aspects of the Evolutionary Status Of W Ursae Majoris Binaries Deduced from Observational Data

Published online by Cambridge University Press:  12 April 2016

Walter Van Hamme
Walter Van Hamme*
Affiliation:
Sterrenkundig Observatorium, Rijksuniversiteit Gent, Belgium

Abstract

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We have developed a test for the evolutionary state of W Ursae Majoris binaries by comparing the observed spectral type of 31 of these systems (14 of type W and 17 of type A) with the expected one when their primary component is an unevolved main sequence star. It appears that both the W- and A-type systems have a primary with a mass and radius too large to be compatible with the observed spectral type,so there is no indication that each type should mark a different evolutionary stage.

Type
Part III: Evolutionary Processes in Close Binary Systems
Information
International Astronomical Union Colloquium , Volume 69: Binary and Multiple Stars as Tracers of Stellar Evolution , 1982 , pp. 301 - 304
Copyright
Copyright © Reidel 1982

References

Kuiper, G.P.: 1941, Astrophys. J. 93, 133 Google Scholar
Wilson, R.E.: 1978, Astrophys. J. 224, 885 CrossRefGoogle Scholar