Statistics – Computation
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..133l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 133-152.
Statistics
Computation
15
Computational Astrophysics, Stellar Oscillations, Stellar Systems, Adiabatic Conditions, Nonequilibrium Thermodynamics, Nonlinear Equations, Radiative Transfer, Stellar Radiation
Scientific paper
The linear oscillation theory of stars was improved to include the nonequilibrium effects of gas and radiation. The bisystem stellar oscillation theory introduces the concept of two thermodynamic systems of a rotating fluid. The gas-radiation interaction was described by the nonequilibrium diffusion approximation and linearized equations and boundary conditions for the oscillation were derived. Nonlinear equations of radiation hydrodynamics and equations of linear oscillations are discussed. Characteristics of adiabatic oscillation are reviewed. Excitation and damping of stellar oscillations due to gas radiation interactions was investigated and an equation for the temporal variation in kinetic energy of the oscillation was derived. It was found that the excitation mechanisms are due to the modulation of radiation absorption or emission by the gas in the unperturbed state, and due to the nonequilibrium of the gas and radiation produced by the oscillations.
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