Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...355..216i&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 355, May 20, 1990, p. 216-225. Research supported by the Research Corp., Du
Astronomy and Astrophysics
Astrophysics
24
Radiative Transfer, Stellar Mass Accretion, Stellar Oscillations, White Dwarf Stars, X Ray Binaries, Magnetohydrodynamics, Shock Waves, Stellar Temperature
Scientific paper
Results of an investigation of the stability properties of radiative shock produced by low-accretion rate flows onto nonmagnetic white dwarfs are presented. The calculations show that low-accretion, settling solution shocks are unstable to oscillations in the fundamental mode for accretion onto white dwarfs of mass up to and including 1 solar mass/yr; therefore, white dwarf accretion shocks are unstable to oscillatory instabilities over a much larger region of parameter space than earlier works suggested. It is suggested that low-accretion rate shock instabilities may be responsible for some of the tens of seconds to several minutes quasi-periodic X-ray variability and flickering observed in the AM Her objects. It is found that two-temperature effects do not significantly alter the observational signatures or stability properties of oscillating white dwarf accretion shocks for low-accretion rate flows onto white dwarfs of masses up to roughly 1.0 solar mass/yr.
Imamura James N.
Wolff Michael Thomas
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