Stellar evolution and nucleosynthesis of Post-AGB-Stars
F. Herwig
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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