%0 Journal Article
%T AGB and Post-AGB Evolution: Structural and Chemical Changes
%A T. Bloecker
%A R. Osterbart
%A G. Weigelt
%A Y. Balega
%A A. Men'shchikov
%J Physics
%D 2001
%I arXiv
%X Structural and chemical changes during the AGB and post-AGB evolution are discussed with respect to two recent observational and theoretical findings. On the one hand, high-resolution infrared observations revealed details of the dynamical evolution of the fragmented, bipolar dust shell around the far-evolved carbon star IRC+10216 giving evidence for rapid changes of an already PPN-like structure during the very end of the AGB evolution. On the other hand, stellar evolution calculations considering convective overshoot have shown how thermal pulses during the post-AGB stage lead to the formation of hydrogen-deficient post-AGB stars with abundance patterns consistent with those observed for Wolf-Rayet central stars.
%U http://arxiv.org/abs/astro-ph/0102383v1