Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-03
Astronomy and Astrophysics
Astrophysics
Invited review given at IAU Symp 234, Planetary Nebulae in the Galaxy and beyond
Scientific paper
10.1017/S1743921306002754
Mass loss on the Asymptotic Giant Branch provides the origin of planetary nebulae. This paper reviews several relevant aspects of AGB evolution: pulsation properties, mass loss formalisms and time variable mass loss, evidence for asymmetries on the AGB, binarity, ISM interaction, and mass loss at low metallicity. There is growing evidence that mass loss on the AGB is already asymmetric, but with spherically symmetric velocity fields. The origin of the rings may be in pulsational instabilities causing mass-loss variations on time scales of centuries.
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