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Thermal instability in a star—gas system

Published online by Cambridge University Press:  13 March 2009

S. P. Talwar and
M. P. Bora
S. P. Talwar
Affiliation:
Department of Physics, University of Delhi, Delhi 110007, India
M. P. Bora
Affiliation:
Department of Physics, Gauhati University, Guwahati, Assam 781014, India
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Abstract

A composite interstellar model consisting of stars and optically thin radiating plasma is considered in order to investigate the thermal instability arising from possible radiation and other heat-loss mechanisms. The stellar dynamics is governed by the Vlasov equation, while the gas is supposed to be a hydromagnetic plasma, described by the MHD equations, with a density- and temperature-dependent heat-loss function. It is shown that while with cold stars the system is in general unstable irrespective of thermal effects of the plasma, with warm stars having a Maxwellian distribution the thermal plasma considerably influences the stability of the composite system. It is also shown that the otherwise stable composite (with warm stars) configuration may become unstable in the presence of a radiating plasma because of coupling between the heat-loss mechanisms and stellar populations.

Information

Type
Research Article
Information
Journal of Plasma Physics , Volume 54 , Issue 2 , October 1995, pp. 157 - 172
Copyright
Copyright © Cambridge University Press 1995

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References

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