Evolution of low-mass close binaries - The mininum orbital period

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Stellar Evolution, Stellar Mass, Stellar Orbits, Angular Momentum, Cataclysmic Variables, Gravitational Waves, Mass Transfer, X Ray Binaries

Scientific paper

The evolution of low-mass close binaries with compact primaries and slightly evolved secondaries has been studied numerically taking into account the angular momentum loss due to a magnetic stellar wind and radiation of gravitational waves. The evolution of such systems leads to the formation of close binaries with orbital periods ≡20m - 80m, the mass exchange rate up to ≡10-9M_sun;/yr, and to the formation of a low-mass helium dwarf. Thus ultrashort-period cataclysmic and X-ray systems with periods lower than ≡80m can be formed.

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