Noise-driven radiative shocks - A new model for the optical quasi-periodic oscillations of the AM Herculis objects

Details Noise-driven radiative shocks - A new model for the optical quasi-periodic oscillations of the AM Herculis objects Noise-driven radiative shocks - A new model for the optical quasi-periodic oscillations of the AM Herculis objects

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...375l..31w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 375, July 1, 1991, p. L31-L34. Research supported by NASA, U.S. N

Astronomy and Astrophysics

Astrophysics

21

Light Curve, Radiative Transfer, Stellar Mass Accretion, Stellar Oscillations, White Dwarf Stars, Shock Wave Propagation, X Ray Binaries

Scientific paper

A model for the 0.3-1.2 Hz optical quasi-periodic oscillations (QPOs) observed in a number of AM Her-type binary systems has been developed. It is suggested that the observed optical modulation is the result of shock oscillations induced by nonsteady accretion flows. It is shown that time-dependent models of radiative shock waves in nonsteady accretion flows onto magnetic white dwarfs with mass 0.6 solar mass and magnetic field strength of 30 MG can produce optical QPOs similar to those observed in the AM Her objects. Theoretical calculations have shown that oscillations cannot be sustained for these white dwarf parameters when the accretion rate is constant.

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