The transfer of resonance radiation in extended envelopes with differential rotation and expansion. Diffuse approximation.
Abstract
A diffusion-type equation is obtained for determining the density of excited atoms in extended, expanding, and rotating stellar shells. Full frequency redistribution with a Doppler profile for the absorption coefficient is assumed. Both radially symmetric expansion and axisymmetric motion involving expansion and differential rotation are considered. The range of applicability of the diffusion approximation is discussed.
- Publication:
-
Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii
- Pub Date:
- 1976
- Bibcode:
- 1976IzKry..54..176G
- Keywords:
-
- Atomic Excitations;
- Diffusion Theory;
- Radiative Transfer;
- Resonance;
- Spectral Line Width;
- Stellar Envelopes;
- Stellar Spectra;
- Absorptivity;
- Approximation;
- Atom Concentration;
- Doppler Effect;
- Gas Expansion;
- Radial Distribution;
- Stellar Mass Ejection;
- Stellar Rotation;
- Astrophysics