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Evolutionary Possibilities and Impossibilities for Solar Type Contact Binaries in NGC 188

Published online by Cambridge University Press:  12 April 2016

Frans Van ’T Veer
Frans Van ’T Veer*
Affiliation:
Institut d'Astrophysique de Paris, 98 bis, boulevard Arago – FRANCE

Abstract

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We give a great number of arguments for the hypothesis that several epochs of star formation have taken place at different times in the old galactic cluster NGC 188.

From the last burst of star formation in this cluster, not more than a few times 108 years ago, 4 contact binaries are still now visible as W UMa stars. With the aid of a simplified probability calculation we argue that these 4 contact binaries are physically related and that the alignment of the orbital axes is not accidental.

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. 279 - 287
Copyright
Copyright © Reidel 1982

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