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AGB and Post-AGB Evolution: Structural and Chemical Changes
Blöcker, T.; Osterbart, R.; Weigelt, G.; Balega, Y.; Men'shchikov, A.
AA(Max-Planck-Institut für Radioastronomie, 53121 Bonn, Germany), AB(Max-Planck-Institut für Radioastronomie, 53121 Bonn, Germany), AC(Max-Planck-Institut für Radioastronomie, 53121 Bonn, Germany), AD(Special Astrophysical Observatory, Nizhnij Arkhyz, 357147, Russia), AE(Stockholm Observatory, 13336 Saltsjöbaden, Sweden)
Post-AGB Objects as a Phase of Stellar Evolution, Proceedings of the Torun Workshop held July 5-7, 2000. Edited by R. Szczerba and S. K. Górny. Astrophysics and Space Science Library Vol. 265, ISBN 07923-71453. Publisher: Kluwer Academic Publishers, Boston/Dordrecht/London, 2001.
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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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