Non-LTE line transfer with partial redistribution. II - an equivalent-two-level-atom approach

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Atomic Energy Levels, Atomic Spectra, Emission Spectra, Line Spectra, Radiative Transfer, Approximation, Distribution Functions, Iterative Solution, Stimulated Emission

Scientific paper

A formulation of equations for radiative transfer in a gas of multilevel atoms, taking into account recent developments of theoretical description, is presented. It is shown that for a simple case where one chosen transition is allowed to depart from complete redistribution, the global multilevel problem may be solved by suitably modified complete-redistribution numerical techniques. In particular, the author has formulated a modification of the equivalent-two-level-atom approach that enables a multilevel transfer to be solved by a simple iteration scheme. Various approximate forms of the line source function are also discussed.

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