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Astron. Astrophys. 340, L43-L46 (1998)


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Letter to the Editor

On the validity of the core-mass luminosity relation for TP-AGB stars with efficient dredge-up

F. Herwig 1, 2, D. Schönberner 2 and T. Blöcker 3

1 Universität Potsdam, Institut für Physik, Astrophysik, Am Neuen Palais 10, D-14469 Potsdam, Germany
(e-mail: fherwig@astro.physik.uni-potsdam.de)
2 Astrophysikalisches Institut Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
(e-mail: fherwig@aip.de, deschoenberner@aip.de)
3 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany (e-mail: bloecker@speckle.mpifr-bonn.mpg.de)

Received 8 September 1998 / Accepted 27 October 1998

Abstract

We investigate the validity of the core mass - luminosity relation (CMLR), originally described by Paczynski (1970), for asymptotic giant branch stars under the presence of third dredge-up events. We find, that models with efficient third dredge-up with less massive cores than those associated with hot bottom burning (Blöcker and Schönberner, 1991) do not obey the linear CMLR.

Complete evolutionary calculations of thermal pulse stellar models which consider overshoot according to an exponential diffusive algorithm show systematically larger third dredge-up for lower core masses ([FORMULA]) than any other existing models. We present and discuss the luminosity evolution of these models.

Key words: stars: AGB and post-AGB – stars: evolution – stars: interiors

Send offprint requests to: F. Herwig

© European Southern Observatory (ESO) 1998

Online publication: November 9, 1998

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