Abstract
We show that mixing by weak turbulence induced by internal gravity waves generated by turbulent gas motions near the base of the convective envelope presents a good alternative to convective overshooting and rotation-driven instabilities as a mechanism for partial mixing in thermally pulsing asymptotic giant branch (AGB) stars. Such mixing ingests protons into the He/C-rich zone which leads to formation of the 1 3 C pocket, a necessary ingredient of the current theory of the s-process under radiative conditions in low-mass AGB stars. We demonstrate that with appropriately chosen, physically reasonable parameters partial mixing by internal gravity waves may produce a much wider 1 3 C pocket than convective overshooting limited to an extent compatible with observations.
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