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Astron. Astrophys. 340, 183-195 (1998)


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New input data for synthetic AGB evolution

J. Wagenhuber and M.A.T. Groenewegen

Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany

Received 1 July 1997 / Accepted 11 September 1998

Abstract

Analytic formulae are presented to construct detailed secular lightcurves of both early asymptotic giant branch (AGB) and thermally pulsing AGB stars. They are based on an extensive grid of evolutionary calculations, performed with an updated stellar evolution code. Basic input parameters are the initial mass [FORMULA], [FORMULA], metallicity [FORMULA], and the mixing length theory (MLT) parameter. The formulae allow for two important effects, namely that the first pulses do not reach the full amplitude, and hot bottom burning (HBB) in massive stars, which are both not accounted for by core mass - luminosity relations of the usual type.

Furthermore, the dependence of the effective temperature and a few other quantities characterizing the conditions at the base of the convective envelope, which are relevant for HBB, are investigated as functions of luminosity, total and core mass for different formulations of the convection theory applied, MLT or Canuto & Mazzitelli's (1991) theory.

Key words: stars: fundamental parameters – stars: evolution – stars: AGB and post-AGB – methods: numerical

Send offprint requests to: M.A.T. Groenewegen (groen@mpa-garching.mpg.de)

© European Southern Observatory (ESO) 1998

Online publication: November 3, 1998

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