Publications
of the
MPIfR Optical & Infrared Interferometry Group

T. Blöcker, R. Osterbart, G. Weigelt, Y. Balega, and A. Men'shchikov:

AGB and Post-AGB Evolution: Structural and Chemical Changes

in Post-AGB objects (protoplanetary nebulae) as a phase of stellar evolution ,
R. Szczerba, S. Gorny (eds.), Kluwer, Dordrecht, p. 241-248 (2001)

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.
bloecker@mpifr-bonn.mpg.de.
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