Time-dependent accretion onto magnetized white dwarfs

Details Time-dependent accretion onto magnetized white dwarfs Time-dependent accretion onto magnetized white dwarfs

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..289l&link_type=abstract

Astrophysical Journal, Part 1, vol. 258, July 1, 1982, p. 289-305.

Astronomy and Astrophysics

Astrophysics

95

Binary Stars, Hydrodynamic Equations, Magnetic Stars, Stellar Mass Accretion, Time Dependence, White Dwarf Stars, Bremsstrahlung, Cyclotron Radiation, Shock Wave Propagation, Stellar Oscillations, X Ray Sources

Scientific paper

Time-dependent accretion onto magnetized white dwarfs is considered. A detailed description of a numerical method of solution to the hydrodynamical equations is given. The postshock flow is cooled by optically thin bremsstrahlung and is thermally unstable. As a result the shock height undergoes periodic oscillations. The properties of this oscillation are considered as a function of the accretion rate and of the mass and radius of the white dwarf. The structure of the accretion flow depends on a single scaling parameter. Below a critical accretion rate, which depends on the particular white dwarf, the nature of the accretion flow changes and the shock propagates up the accretion column indefinitely.

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