Monte Carlo calculations of resonance radiative transfer through a semi-infinite atmosphere

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Monte Carlo Method, Radiative Transfer, Resonance Lines, Stellar Atmospheres, Astronomical Models, Boundary Value Problems, Optical Density, Photons

Scientific paper

Results are presented of resonance radiative transfer calculations for a plane-parallel semi-infinite atmosphere. In the calculations, an isotropically emitting source of line photons is embedded at a certain line-center optical depth from the edge of the atmosphere. In reality, the thermalization length provides an effective physical cutoff for the optical depth of a stellar atmosphere, usually, however, with the thermalization length being much greater than line-center optical depth. The absence of any true absorber is assumed here, but an effectively finite medium is considered by introducing a perfectly reflecting mirror at a certain depth beyond the photon source.

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