Institut für Astronomie und Astrophysik

Abteilung Astronomie

Preprint 13/98

The Classical Stellar Atmosphere Problem

Klaus Werner and Stefan Dreizler

Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany

To appear in: Computational Astrophysics, The Journal of Computational and Applied Mathematics, eds. H. Riffert, K. Werner, in press

Abstract. We introduce the classical stellar atmosphere problem and describe in detail its numerical solution. The problem consists of the solution of the radiation transfer equations under the constraints of hydrostatic, radiative and statistical equilibrium (non-LTE). We outline the basic idea of the Accelerated Lambda Iteration (ALI) technique and statistical methods which finally allow the construction of non-LTE model atmospheres considering the influence of millions of metal absorption lines. Some applications of the new models are presented.

Paper (539k gzip'ed Postscript including figures)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de) Last updated 07-Jan-1999