The formation and evolution of low-mass close binaries with compact components

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cataclysmic Variables, Star Formation, Stellar Evolution, Stellar Mass Accretion, X Ray Binaries, Black Holes (Astronomy), Dwarf Stars, Gravitational Waves, Neutron Stars, Stellar Composition, Stellar Orbits, Stellar Winds

Scientific paper

The main properties of evolution of low-mass binaries with a an He-, CO-, or ONe-dwarf neutron star or a black hole as a compact component, and whose evolutions are accompanied by flashes of different types, are discussed. The main driving forces of their evolution are the angular momentum loss by gravitational wave radiation, and nuclear evolution of the secondary if its initial mass exceeds about 0.8 solar masses. Numerical computations of evolution with momentum loss are used to explain the observed mass exchange rates in such systems, the absence of cataclysmic variables with 2-3 h orbital periods, and the evolutionary status of systems with orbital periods shorter than 80 min. Various unresolved problems are considered.

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