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+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.
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Blöcker, T., Osterbart, R., Weigelt, G., Balega, Y., Men’shchikov, A. (2001). AGB and Post-AGB Evolution: Structural and Chemical Changes. In: Szczerba, R., Górny, S.K. (eds) Post-AGB Objects as a Phase of Stellar Evolution. Astrophysics and Space Science Library, vol 265. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9688-6_37
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DOI: https://doi.org/10.1007/978-94-015-9688-6_37
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