On the stability of age-zero contact binaries. II

Details On the stability of age-zero contact binaries. II On the stability of age-zero contact binaries. II

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109..117h&link_type=abstract

Astronomy and Astrophysics, vol. 109, no. 1, May 1982, p. 117-122.

Astronomy and Astrophysics

Astrophysics

13

Binary Stars, Secular Variations, Stellar Evolution, Thermal Stability, Stellar Mass, Systems Stability, Time Dependence

Scientific paper

The secular stability of a contact binary system of 0.85 + 0.5 solar mass is investigated. The system, which is chemically unevolved ('age-zero') is found to be secularly stable. Using the results of this and a previous paper, it is suggested that evolution of contact binaries can occur in either 'cyclic' (secularly unstable) or 'non-cyclic' (secularly stable) modes, depending on the system parameters. According to either picture, a problem arises in connection with the ages of the four W UMa systems in NGC 188.

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