Computer Science – Sound
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..404h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. 404-417. Research supported by the University of Cali
Computer Science
Sound
13
Stellar Mass Accretion, X Ray Binaries, Perturbation Theory, Phase Coherence, Stellar Luminosity, Stellar Winds
Scientific paper
The paper studies the stability and fluctuation of the mass transfer onto a binary X-ray source fed by the primary's radiation-driven wind and regulated by the ionization feedback of the X-rays. Under plausible assumptions of the wind properties and geometry, the low-luminosity solutions are found to be stable with respect to purely growing perturbations but allow overstable modes for the oscillatory perturbations, i.e., the perturbation oscillates with an increasing amplitude. The oscillation period is typically a fraction of the wind transit time, and the growth time is of the same order as the transit time. The growth mode depends crucially on the phase coherence of the oscillation as the wind propagates to the secondary from the Stromgren surface, where the radiation line force on the wind is turned off. The growth rate and the amplitude are limited by effects which diminish the wave's coherence. Examples of such factors are the finite sound speed and the finite sharpness in the turnoff of the radiation line force at the Stromgren surface.
Arons Jonathan
Ho Cheng
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