Thermal instabilities in a nonstationary medium

Details Thermal instabilities in a nonstationary medium Thermal instabilities in a nonstationary medium

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sva....22..182s&link_type=abstract

(Astronomicheskii Zhurnal, vol. 55, Mar.-Apr. 1978, p. 311-317.) Soviet Astronomy, vol. 22, Mar.-Apr. 1978, p. 182-186. Transla

Astronomy and Astrophysics

Astrophysics

2

Astrophysics, Interstellar Gas, Stellar Evolution, Thermal Instability, Energy Dissipation, Gas Temperature, Time Dependence, Wavelengths

Scientific paper

Thermal instabilities of the interstellar gas are investigated for unsteady-state conditions corresponding to a time-dependent temperature and a generalized loss function (L) not equal to zero. Stability criteria are obtained for perturbations of different wavelengths. The temperature range in which short-wavelength perturbations may be thermally unstable is found to be broader in a cooled (L greater than zero) medium than in a heated (L less than zero) or a steady-state (L equals zero) medium. It is shown that long-wavelength perturbations will dissipate on the thermal-evolution time scale of a system in most cases, even if such perturbations initially intensify. Thermal instability of the interstellar gas as a possible star-formation mechanism is considered.

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