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Perturbative analysis of two-temperature radiative shocks with multiple cooling processes

Saxton, C; Wu, K; (1999) Perturbative analysis of two-temperature radiative shocks with multiple cooling processes. Monthly Notices of the Royal Astronomical Society , 310 (3) 677 - 692. 10.1046/j.1365-8711.1999.02967.x. Green open access

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Abstract

The structure of the hot downstream region below a radiative accretion shock, such as that of an accreting compact object, may oscillate because of a global thermal instability. The oscillatory behaviour depends on the functional forms of the cooling processes, the energy exchanges of electrons and ions in the shock-heated matter, and the boundary conditions. We analyse the stability of a shock with unequal electron and ion temperatures, where the cooling consists of thermal bremsstrahlung radiation which promotes instability, plus a competing process which tends to stabilize the shock. The effect of transverse perturbations is considered also. As an illustration, we study the special case in which the stabilizing cooling process is of order 3/20 in density and 5/2 in temperature, which is an approximation for the effects of cyclotron cooling in magnetic cataclysmic variables. We vary the efficiency of the second cooling process, the strength of the electron–ion exchange and the ratio of electron and ion pressures at the shock, to examine particular effects on the stability properties and frequencies of oscillation modes.

Type: Article
Title: Perturbative analysis of two-temperature radiative shocks with multiple cooling processes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1046/j.1365-8711.1999.02967.x
Publisher version: http://dx.doi.org/10.1046/j.1365-8711.1999.02967.x
Language: English
Additional information: © 1999 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/52776
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