Multidimensional radiative transfer in stratified atmospheres. VI - Radiative instabilities

Bibcode
1990A&A...232..135T
Trujillo Bueno, J.; Kneer, F.
Referencia bibliográfica

Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 1, June 1990, p. 135-150. Research supported by DGICYT and CICYT.

Fecha de publicación:
6
1990
Número de autores
2
Número de autores del IAC
1
Número de citas
13
Número de citas referidas
10
Descripción
The possibility that radiative instabilities in stellar atmospheres are driven by transfer of energy processes between stellar gas and the radiation field is considered. Harmonic temperature fluctuations in gray radiative equilibrium atmospheres are introduced, and the linear response of the radiation field to the ensuing Planck-function and opacity fluctuations is investigated. Analytical and numerical calculations are performed, emphasizing the influence of the multidimensional radiative transfer (MRT) effects of opacity fluctuations on the radiative relaxation time as a function of the wavenumber of the perturbations. Quantitative examples are given for stellar atmospheres with solarlike T(eff) and gravitational stratification. It is concluded that, while the MRT effects of B fluctuations generally tend to be stabilizing, the MRT effects of chi fluctuations are optically important for driving radiative instabilities.
Tipo
Con árbitro
Transferencia radiativa
Ambientes estelares
Oscilaciones estelares

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