The Evolution of Central Stars of Planetary Nebulae
Abstract
The evolution of central stars of planetary nebulae can proceed in several distinct ways, either leading to H-deficiency or to H-normal surface composition. Several new simulations of the evolution channels that lead to H-deficiency are now available, mainly the born-again scenarios that are triggered by a He-shell flash during the hot pre-white dwarf evolution phase. A realistic AGB progenitor evolution is important for correct HRD tracks, that allow mass determinations. New hydrodynamic simulations of He-shell flash convection including cases with H-ingestion are now performed, and allow a determination of the convective extra-mixing efficiency. This has direct consequences for the intershell abundance distribution of AGB stars that can be observed in the H-deficient CSPN.
Keywords
Cite
@article{arxiv.astro-ph/0606603,
title = {The Evolution of Central Stars of Planetary Nebulae},
author = {Falk Herwig and Bernd Freytag and Klaus Werner},
journal= {arXiv preprint arXiv:astro-ph/0606603},
year = {2009}
}
Comments
8 pages, 4 figures, invited talk IAU Symp 234 Planetary Nebulae