Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98..213v&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 2, May 1981, p. 213-217.
Astronomy and Astrophysics
Astrophysics
15
Binary Stars, Mass Ratios, Stellar Evolution, Stellar Mass, Angular Momentum, Mass Transfer, Momentum Transfer
Scientific paper
The initial mass ratio distribution function, which gives the normalized number of binary objects formed at a given mass ratio, is computed for solar-type contact binaries (W UMa stars). The initial function is derived from the present mass ratio distribution function by integrating backwards in time based on a mass ratio evolution function describing the variation of the mass ratio with time since the coming into contact of the components, which is determined by the rate of angular momentum loss which is in turn determined by the total mass and mass ratio of the system. All contact binaries produced are found to exhibit initial mass ratios greater than 0.8, indicating that the components had nearly equal masses. Implications of the results for RS CVn stars are noted.
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