Disc oscillation model for quasi-periodic light variations in cataclysmic variables

Details Disc oscillation model for quasi-periodic light variations in cataclysmic variables Disc oscillation model for quasi-periodic light variations in cataclysmic variables

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..427o&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 1, 1992, p. 427-434.

Astronomy and Astrophysics

Astronomy

27

Accretion Disks, Cataclysmic Variables, Stellar Oscillations, Dwarf Novae, Novae, Stellar Luminosity, White Dwarf Stars

Scientific paper

A radial oscillation model of accretion disks for quasi-periodic light variations in cataclysmic variables is examined by means of numerical simulations. It is known that when the alpha model is used for the viscosity, accretion disks around compact objects are overstable against radial axisymmetric oscillations under a variety of conditions. The present calculations demonstrate that radial oscillations of the accretion disks around white dwarfs yield quasi-periodic oscillations (QPOs) in the disk of luminosity Ld. The calculated QPO periods are about 80-400 s for alpha = 0.1 and for the mass-transfer rate of about 10 exp 17 - 10 exp 19 g/s. The oscillation amplitudes range from about 0.3 to 0.6 percent of Ld and are higher for high Ld. These characteristics are in good agreement with the observations.

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