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Astron. Astrophys. Suppl. Ser.
Volume 136, Number 1, April I 1999
Page(s) 217 - 226
Published online 15 April 1999
DOI: 10.1051/aas:1999462

Astron. Astrophys. Suppl. Ser. 136, 217-226

A nonlinear convective model for radial stellar pulsations

I. The physical description

M.U. Feuchtinger

Send offprint request: M.U. Feuchtinger,

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

Received November 6, 1998; accepted January 4, 1999


The physical and numerical ingredients of the Vienna nonlinear model for radially pulsating stars are presented. Stellar pulsations are investigated by solving the full system of radiation hydrodynamics including a time-dependent formulation of turbulent convection. The numerical solution method comprises a state-of-the-art adaptive grid algorithm which provides a powerful tool for resolving and tracking the most important ionization zones. Several already published applications to pulsating stars in the classical instability strip demonstrate that the model is able to reproduce important observational properties like RR Lyrae light curves or double mode pulsations.

Key words: stars: variables -- hydrodynamics -- stars: oscillations -- methods: numerical

Copyright The European Southern Observatory (ESO)

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