Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.340..722d&link_type=abstract
Monthly Notice of the Royal Astronomical Society, Volume 340, Issue 3, pp. 722-732.
Astronomy and Astrophysics
Astronomy
46
Convection, Nuclear Reactions, Nucleosynthesis, Abundances, Waves, Stars: Agb And Post-Agb, Stars: Evolution, Stars: Interiors
Scientific paper
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 13C 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 13C pocket than convective overshooting limited to an extent compatible with observations.
Denissenkov Pavel A.
Tout Christopher A.
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