The Evolution of AGB Stars Towards Planetary Nebulae

Details The Evolution of AGB Stars Towards Planetary Nebulae The Evolution of AGB Stars Towards Planetary Nebulae

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001assl..265...85s&link_type=abstract

Post-AGB Objects as a Phase of Stellar Evolution, Proceedings of the Toruń Workshop held July 5-7, 2000. Edited by R. Szczerba a

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

We combined hydrodynamical simulations with stellar evolutionary calculations based on prescribed mass-loss rates in order to get a better understanding of how structure and kinematics of circumstellar matter develop with time during the late AGB and the following post-AGB evolution. We show (i) that the final density profile of the circumstellar shells produced by AGB mass loss falls off steeper than ρ ~r-2, (ii) that stages of high mass-loss rates are periodically interrupted by shorter phases of much lower outflow rates and speeds due to the luminosity dips associated with thermal pulses, and (iii) that during the post-AGB evolution ionization destroys the initial density and velocity distribution set up at the end of the AGB.

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