Masses and angular momenta of contact binary stars

Details Masses and angular momenta of contact binary stars Masses and angular momenta of contact binary stars

2006-06-29

arxiv.org/abs/astro-ph/0606715v1

Mon.Not.Roy.Astron.Soc.Lett. 370 (2006) L29-L32; Erratum-ibid. 372 (2006) L83

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, accepted in MNRAS

Scientific paper

10.1111/j.1745-3933.2006.00182.x

Results are presented on component masses and system angular momenta for over a hundred low-temperature contact binaries. It is found that the secondary components in close binary systems are very similar in mass. Our observational evidence strongly supports the argument that the evolutionary process goes from near-contact binaries to A-type contact binaries, without any need of mass loss from the system. Furthermore, the evolutionary direction of A-type into W-type systems with a simultaneous mass and angular momentum loss is also discussed. The opposite direction of evolution seems to be unlikely, since it requires an increase of the total mass and the angular momentum of the system.

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