Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.203..227s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 203, no. 2, p. 227-240.
Astronomy and Astrophysics
Astrophysics
2
Eddington Approximation, Method Of Moments, Numerical Integration, Radiative Transfer, Stellar Atmospheres, Boundary Conditions, Nongray Atmospheres, Spheres
Scientific paper
A moment method with three stream division of the radiation field was suggested by Wilson, Wan and Sen (1980) for solving radiative transfer problems in stationary, nongrey extended shells surrounding a central star. Use was made of the generalized Eddington relations as the closure conditions of the moment equations. In the present paper, the same method has been utilized to study the radiative transfer problems in a nongrey, expanding gaseous spherical shells surrounding a central star. The transfer equation has been set in comoving frame in spherical geometry. The radiation and material quantities, angles and frequencies have been expressed in comoving frame. The mean intensity, flux and K-integrals have been calculated for extensive atmospheres in the presence of different velocity fields.
Sen Kalidas
Wilson J. S.
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