Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
T. Driebe and T. Blöcker:
Stellar Evolution for Low and
Intermediate-Mass Stars with Rotation and Overshoot
Abstract (poster) for:
Astronomische Gesellschaft Meeting Abstracts (AGM 15, P19)
New Astrophysical
Horizons
Annual Scientific Meeting of the Astronomische Gesellschaft, Sep 21-25,
1999, Göttingen, Germany
Abstract.
We expanded our stellar evolution code to treat the effects of rotation
on the structure and evolution of low and intermediate mass
stars. For this purpose we included the centrifugal term in the
hydrostatic
equation, considered angular momentum transport and
took into account rotation induced mixing processes as in Heger et al.
(1999). Convective overshoot was considered according to the
hydrodynamical simulations of Freytag et al. (1996) recently being
introduced
to AGB models by Herwig et al. (1997). Additionally
we used a coupled scheme of nucleosynthesis and mixing.
In this exploratory study we investigate the effects of rotation and
overshoot on low and intermediate-mass stars on the main
sequence and beyond. The width of the main sequence depends on the
extent of
the convective core and therefore on the mixing
processes considered. We focus on the question if in the case of
rotation a
certain amount of overshoot is still required to model the
observed width of the main sequence. Abundance ratios as, for instance,
C12/C13, constrain the efficiency of the various
mixing treatments and are studied for different evolutionary stages.
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