AGB and post-AGB evolution:: Structural and chemical changes

被引:0
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作者
Blöcker, T [1 ]
Osterbart, R [1 ]
Weigelt, G [1 ]
Balega, Y [1 ]
Men'shchikov, A [1 ]
机构
[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany
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中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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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页码:241 / 248
页数:8
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