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AGB AND POST-AGB EVOLUTION: STRUCTURAL AND CHEMICAL CHANGES

By T. Blöcker, R. Osterbart, G. Weigelt and Y. Balega

Abstract

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 +10 216 giving evidence for rapid changes of an already PPNlike 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 hydrogendeficient post-AGB stars with abundance patterns consistent with those observed for Wolf-Rayet central stars. 1

Year: 2001
OAI identifier: oai:CiteSeerX.psu:10.1.1.316.9998
Provided by: CiteSeerX
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