The Evolution of Central Stars of Planetary Nebulae

Details The Evolution of Central Stars of Planetary Nebulae The Evolution of Central Stars of Planetary Nebulae

2006-06-23

arxiv.org/abs/astro-ph/0606603v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, invited talk IAU Symp 234 Planetary Nebulae

Scientific paper

10.1017/S1743921306002833

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.

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