Available formats: HTML | PDF | (gzipped) PostScript
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
Received 8 September 1998 / Accepted 27 October 1998
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 () 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
Online publication: November 9, 1998