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The Formation and Evolution of Low-Mass Close Binaries with Compact Components

Conference paper
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Abstract

We discuss the formation and evolution of interacting low- mass close binaries with a He-1CO- or ONe-dwarf neutron star or a black hole as a compact component. Mass exchange leads to cataclysmic events in such systems. The rate of semidetached low- mass close binary formation is 5xl0-3 yr-1 if the accreting component is a He degenerate dwarf, 5xl0-3 yr-1 if it is a CO-dwarf and 3x10-8 yr-1 if it is a neutron star. Systems with compact accretors arise as the result of the common envelope phase of close binary evolution or due to collisions of single neutron stars or dwarfs with low-mass single stars in dense stellar clusters. Evolution of LMCB to the contact phase in semi-detached stages is determined mainly by the angular momentum losses by a magnetic stellar wind and radiation of gravitational waves. Numerical computations of evolution with momentum loss explain observed mass exchange rates in such systems, the absence of cataclysmic variables with orbital periods 2h-3h, the low number and the evolutionary status of systems with orbital periods shorter than 80m. In conclusion we list unsolved problems related to magnetic stellar wind, the distribution of young close binaries over main initial parameters, stability of mass exchange.

Keywords

Orbital Period Neutron Star Semimajor Axis Roche Lobe Cataclysmic Variable 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1987

Authors and Affiliations

  1. 1.Astronomical Council of the USSR Academy of SciencesMoscowUSSR

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