On the stability and evolution of contact binaries. I

Details On the stability and evolution of contact binaries. I On the stability and evolution of contact binaries. I

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109...66r&link_type=abstract

Astronomy and Astrophysics, vol. 109, no. 1, May 1982, p. 66-76. Research supported by the Academy of Finland and Suomen Kulttu

Astronomy and Astrophysics

Astrophysics

16

Binary Stars, Secular Variations, Stellar Evolution, Thermal Stability, Energy Transfer, Entropy, Main Sequence Stars, Mass Ratios, Stellar Mass

Scientific paper

The stability and evolution of zero-age and evolved contact binaries is investigated. A zero-age system of 1.0-solar mass and 0.6 solar mass is found to be unstable and the subsequent evolution occurs in thermal cycles with a period of about six-million years. During the cycles the system is permanently in contact and the entropy difference is large. Nuclear evolution seems to remove the instability. After about one-billion years the system is found to be stable and it evolves towards more extreme mass ratios and equal entropies. The adopted form of the equation describing the energy transport between the two stars and the relevance of the results for the theory of W UMa stars are discussed.

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