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Astron. Astrophys. 346, L9-L12 (1999)


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Letter to the Editor

A new generation of dynamic model atmospheres for AGB stars: first results

S. Höfner

Institut für Astronomie der Universität Wien, Türkenschanzstrasse 17, A-1180 Wien, Austria

Received 12 April 1999 / Accepted 26 April 1999

Abstract

Existing time-dependent dynamic model atmospheres for AGB stars suffer from the fact that they are based on grey radiative transfer which is a poor approximation for cool line-blanketed atmospheres. Therefore, frequency-dependent radiative transfer has been included into a well-tried radiation hydrodynamics code to obtain more realistic models. First results concerning the structure of such non-grey dynamical model atmospheres are presented in this paper. Due to computational reasons, the number of frequencies used in the radiative transfer has to be kept very low, typically around 50, but even with this restriction considerable improvements can be obtained compared to grey models.

Key words: stars: AGB and post-AGB – stars: variables: general – stars: atmospheres – hydrodynamics – radiative transfer

Send offprint requests to: hoefner@astro.univie.ac.at

© European Southern Observatory (ESO) 1999

Online publication: May 6, 1999

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