The thermal surface boundary condition for stellar pulsations

Details The thermal surface boundary condition for stellar pulsations The thermal surface boundary condition for stellar pulsations

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208..122g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. 122-128.

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7

Boundary Conditions, Computational Astrophysics, Stellar Atmospheres, Stellar Oscillations, Stellar Systems, Eddington Approximation, Radiative Transfer, Tensor Analysis

Scientific paper

The thermal surface boundary condition for stellar pulsations is discussed for radial and nonradial oscillations. It is shown that for nonradial oscillations the use of the Eddington approximation leads to the divergence of the nonradial components of the perturbed flux in the outer layers. This is avoided by introducing a variable Eddington factor. The horizontal component of the perturbed flux is then given, in the outer layers, by a differential equation without singularity at the surface.

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