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Oscillatory instability of radiative shocks with multiple cooling processes

C. J. SaxtonSir Frank Packer Department of Theoretical Physics , School of Physics , University of Sydney , NSW 2006 , AustraliaKinwah WuSpecial Research Centre for Theoretical Astrophysics , School of Physics , University of Sydney , NSW 2006 , AustraliaH. PongracicAir Operations Division , Aeronautical and Maritime Research Laboratory , Defence Science and Technology Organisation , VIC 3001 , AustraliaG. ShavivAsher Space Research Institute and

1998en

Ochiq kirishBronza

ABI

Annotatsiya

The stand-off shock formed in the accretion flow on to a stationary wall, such as the surface of a white dwarf, may be thermally unstable, depending on the cooling processes which dominate the post-shock flow. Some processes lead to instability, while others tend to stabilize the shock. We consider competition between the destabilizing influence of thermal bremsstrahlung cooling, and a stabilizing process which is a power law in density and temperature. Cyclotron cooling and processes which are of order 1, 3/2 and 2 in density are considered. The relative efficiency and power-law indices of the second mechanism are varied, and particular effects on the stability properties and frequencies of oscillation modes are examined.

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Identifikatorlar

DOI: 10.1046/j.1365-8711.1998.01839.x

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