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Theoretical Methods of Treating Line Formation Problems in Steady-State Extended Atmospheres

Published online by Cambridge University Press:  08 February 2017

George B. Rybicki
George B. Rybicki*
Affiliation:
Smithsonian Astrophysioal Observatory, Cambridge, Massachusetts

Abstract

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Theoretical methods applicable to the study of line formation in steady-state extended atmospheres are reviewed. The formal solution of the transfer equation is considered, as well as numerical and analytical methods of determining the source function. Topics discussed include: the local frequency transformation, geometrical effects, and the case of large velocity gradients. A new plane-parallel approximation for spherically symmetric moving atmospheres is given that takes account of transverse velocity gradients.

Keywords

spectral line formatiospherical geometrradiative transfestellar atmospheremoving atmospheres
Type
Part B. Theoretical Methods for Handling Non-LTE Problems
Information
International Astronomical Union Colloquium , Volume 2: Spectrum Formation in Stars With Steady-State Extended Atmospheres , August 1970 , pp. 85 - 118
Copyright
Copyright © 1970

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