Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..316e&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 2, July 1983, p. 316-318.
Astronomy and Astrophysics
Astrophysics
5
Angular Momentum, Binary Stars, Orbital Elements, Stellar Evolution, Stellar Rotation, Tides, Celestial Mechanics, Main Sequence Stars
Scientific paper
Because the majority of BY Draconis-type stars are binary, the relatively high rotation rate of these stars is in most cases shown to be the result of tidal locking of the orbital and rotational periods. This makes it impossible to use these stars to derive the initial angular momentum distribution for low mass zero age main sequence stars as attempted by Carrasco et al. (1980) unless only the demonstrably single members of this group are used. Since tidal locking in close binaries takes place very quickly in comparison to the components main sequence lifetimes, the rotation rates cannot be used to infer anything about the ages of the systems except in the case of young systems that have not yet synchronized, such as BY Draconis itself. The arguments presented suggest an explanation for the high incidence of binary stars among BY Draconis objects together with the occurrence of single stars of this type as well as the distribution of ages.
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