Physics
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975izssr......126k&link_type=abstract
Akademiia Nauk SSSR, Izvestiia, Mekhanika Zhidkosti i Gaza, Mar.-Apr. 1975, p. 126-132. In Russian.
Physics
Gas Temperature, Interstellar Gas, Nonequilibrium Conditions, Radiant Heating, Stellar Radiation, Wave Propagation, Gas Ionization, H Ii Regions, Perturbation Theory, Photoionization, Plasma Oscillations, Plasma Waves
Scientific paper
The propagation of disturbance waves in a circumstellar gas is investigated. The gas medium is ionized and heated by the ultraviolet radiation emitted from a central star so that the region thus produced is referred to as HII region containing almost fully ionized hydrogen at roughly 10,000 K. The attenuation time and dispersion law of the waves are obtained in a linear approximation. The analysis of the problem in nonlinear formulation indicates that for almost adiabatic oscillations, the velocity profile of the waves become steeper with attenuation of waves. The propagation of disturbances is described by the Burgers equation which allows a steady-state solution of shock wave modes. Numerical calculations for specific values of the circumstellar gas parameters are presented.
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