Stellar evolution and nucleosynthesis of Post-AGB-Stars

F. Herwig

Universität Potsdam, Institut für Physik, Astrophysik
Institute for Physics and Astronomy, University of Victoria, Canada

I discuss recent new models of post-Asymptotic Giant Branch stellar evolution. These models aim to clarify the evolutionary origin and status of a variety of hydrogen-deficient post-AGB stars such as central stars of planetary nebulae of Wolf-Rayet spectral type, PG1159 stars or Sakurai's object. Starting with AGB models with overshoot stars can evolve through one of four distinct channels. Each of these channels has typical abundance patterns depending on the timing of the departure off the AGB and the occurrence of the last thermal pulse. I discuss the responsible mechanisms and the respective observational counterparts.

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