Evolution of double degenerate binary systems

Details Evolution of double degenerate binary systems Evolution of double degenerate binary systems

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.5401g&link_type=abstract

American Astronomical Society Meeting 207, #54.01; Bulletin of the American Astronomical Society, Vol. 37, p.1237

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Scientific paper

A simple semi-analytic approach is adopted to investigate the evolution of non-magnetic double degenerate binary systems. We consider the effects of: (i) various orbital angular momentum loss and redistribution mechanisms such as gravitational wave radiation, winds, tides and direct impact accretion and, (ii) different mass-radius relationships for cold and warm white dwarfs. The mass transfer rate can be determined either for polytropic donors or for isothermal atmospheres with a given scale height. We find that in general, the fate of the binary is determined by the initial mass-ratio q = Mdonor/M{ accretor}, the mass-radius relationship and the consequential angular momentum loss mechanisms in the system. Depending on how unstable the initial configuration is, the binary evolves to either a merger, tidal disruption of the donor or to stable mass transfer after a separation ``bounce" leading to formation of AM CVn type systems.

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