Paper:	AGB Evolution
Volume:	313, Asymmetrical Planetary Nebulae III
Page:	387
Authors:	Herwig, F.
Abstract:	Recent models of rotating Asymptotic Giant Branch stars have difficulties to account for observed s-process features in these stars. White dwarf rotation rates from asterioseismology may corroborate the impression that some important model ingredient is missing. In this context the proposal of Spruit (1998) is discussed that even weak magnetic fields enforce rigid rotation throughout the successive evolutionary phases. Rotationally induced mixing at the core-envelope interface of the AGB star may then be much weaker and only due to meridional circulation. The concept of the s-process in the interpulse phase under radiative conditions may then be reinstated, and even improved by means to account for the observed spread in s-process efficiency. I will also briefly review recent models of Z=0 AGB stars.

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