Noise-driven radiative shocks. II - Further implications for the quasi-periodic oscillations of the AM Herculis objects

Details Noise-driven radiative shocks. II - Further implications for the quasi-periodic oscillations of the AM Herculis objects Noise-driven radiative shocks. II - Further implications for the quasi-periodic oscillations of the AM Herculis objects

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398..593w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 398, no. 2, p. 593-601.

Astronomy and Astrophysics

Astrophysics

19

Shock Wave Propagation, Stellar Mass Accretion, Stellar Oscillations, Stellar Radiation, White Dwarf Stars, Bremsstrahlung, Cyclotron Radiation, Stellar Luminosity, Stellar Models, X Ray Spectra

Scientific paper

The driven-shock model by Wolff et al. (1992) is extended and used to model the low-amplitude quasiperiodic oscillations (QPOs) driven by accretion noise in AM Her objects. The driven-shock model is discussed qualitatively with calculational details of the revised version. QPO-like features in the optical and X-ray are shown to be produced by bremsstrahlung-dominated shocks from accretion onto white dwarfs. These features are found to be consistent with the range of properties associated with the AM Her QPO sources. The bremsstrahlung-dominated shocks are shown to have linear responses for the conditions associated with QPO sources, and a luminosity expression for QPO sources is derived. The present analysis supports the shock-oscillation model for describing the optical QPOs from these objects.

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