Radiative forces in expanding envelopes

Details Radiative forces in expanding envelopes Radiative forces in expanding envelopes

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62..135s&link_type=abstract

Astronomy and Astrophysics, vol. 62, no. 1-2, Jan. 1978, p. 135-141.

Mathematics

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7

Radiative Transfer, Resonance Scattering, Stellar Envelopes, Stellar Motions, Energy Levels, Equilibrium Equations, Hot Stars, Line Spectra, Probability Theory, Radial Velocity, Stellar Atmospheres

Scientific paper

The escape probability method introduced by Sobolev (1957) is applied to derive expressions for the radiative forces acting on atoms by the resonance scattering of radiation in envelopes which expand spherically with positive or negative radial-velocity gradients. In the latter case, it is shown that the contribution of the whole stellar envelope to the radiative force acting on individual atoms has the same effect as the one due to the stellar core radiation; i.e., a radial outward acceleration. Numerical applications to a two-level atom model illustrate the behavior of radiative forces in outward-accelerating and outward-decelerating stellar envelopes.

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