Problem of diffusion of radiation in a moving medium. I - Plane symmetry

Details Problem of diffusion of radiation in a moving medium. I - Plane symmetry Problem of diffusion of radiation in a moving medium. I - Plane symmetry

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977velen......114g&link_type=abstract

Leningradskii Universitet, Vestnik, Matematika, Mekhanika, Astronomiia, Oct. 1977, p. 114-120. In Russian.

Astronomy and Astrophysics

Astrophysics

Astronomical Models, Astrophysics, Diffuse Radiation, Radiative Transfer, Albedo, Asymptotic Series, Doppler Effect, Kernel Functions, Mean Free Path, Nebulae, Optical Thickness, Photons, Stellar Atmospheres, Thermalization (Energy Absorption), Velocity Distribution

Scientific paper

The asymptotic behavior is studied of the kernel function of the integral equation describing radiative transfer in a plane-parallel medium moving perpendicular to the layers with a constant velocity gradient, gamma; it is assumed that there is complete frequency redistribution in the comoving frame of reference. Doppler and power profiles of the absorption coefficient are considered. The asymptotic behavior of characteristic lengths (mean free path of a photon, thermalization length in an infinite medium, and boundary layer thickness in a semiinfinite medium with uniformly distributed primary sources) is examined for these profiles, assuming gamma to be much less than unity. The study has astrophysical applications, e.g., to radiative transfer in nebulae and stellar atmospheres.

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