AGB and Post-AGB Evolution: Structural and Chemical Changes
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.
Cite
@article{arxiv.astro-ph/0102383,
title = {AGB and Post-AGB Evolution: Structural and Chemical Changes},
author = {T. Bloecker and R. Osterbart and G. Weigelt and Y. Balega and A. Men'shchikov},
journal= {arXiv preprint arXiv:astro-ph/0102383},
year = {2016}
}
Comments
8 pages including 4 PostScript figures; also available from http://www.mpifr-bonn.mpg.de/div/ir-interferometry/publications.html; Proceedings of "Post-AGB Objects (Proto-Planetary Nebulae) as a Phase of Stellar Evolution", R. Szczerba, R. Tylenda, S.K. Gorny (eds.), in press