Redistribution effects in expanding atmospheres - The angle averaged redistribution function in the comoving frame

Details Redistribution effects in expanding atmospheres - The angle averaged redistribution function in the comoving frame Redistribution effects in expanding atmospheres - The angle averaged redistribution function in the comoving frame

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....54..525h&link_type=abstract

Astronomy and Astrophysics, vol. 54, no. 2, Jan. 1977, p. 525-529.

Astronomy and Astrophysics

Astrophysics

10

Astrophysics, Distribution Functions, Radiative Transfer, Stellar Atmospheres, Thermodynamic Equilibrium, Doppler Effect, Radiant Flux Density, Stellar Luminosity, Stellar Models, Transfer Functions

Scientific paper

The problem of radiative transfer in expanding plane-parallel atmospheres is solved in the comoving frame by using the angle-averaged redistribution function at local frequencies and extending the method of Noerdlinger and Rybicki (1974) to redistribution effects. A two-level-atom approximation is employed, only pure Doppler broadening is considered, and Schuster-type boundary conditions are specified. The solution scheme is slightly modified to incorporate the frequency-dependent source function, and the formal integration of the transfer equation is carried out in the observer's frame in order to obtain emergent intensity profiles. Four simple models which should be representative of the wide range of possibilities in stellar atmospheres are examined to investigate departures from complete redistribution in expanding atmospheres. It is found that such departures in the case of pure Doppler broadening are small in the presence of macroscopic velocity fields and are even diminished in comparison with the static cases.

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