EPJ Web Conf.
Volume 275, 202311ᵗʰ European Summer School on Experimental Nuclear Astrophysics
|Number of page(s)||6|
|Section||Session 1: Lectures|
|Published online||03 February 2023|
Magnetic and non-magnetic AGB mixing for s-processing
1 Department of Physics and Geology, University of Perugia, Via A. Pascoli snc, I-06125 Perugia, Italy
2 INFN Section of Perugia, Via A. Pascoli snc, I-06125 Perugia, Italy
* e-mail: firstname.lastname@example.org
Published online: 3 February 2023
I outline a few features of recent models for the formation of the neutron source 13C(α,n)16O in low mass stars (1 ≲ M/M⊙ ≲ 3, LMS ) ascendingfor the second time the Red Giant Branch, generally called Asymptotic Giant Branch, or AGB stars. I also briefly outline the nucleosynthesis results obtained trough them. The mentioned models consider the physical structure below the frequent downward extensions of the convective envelope into the He-intershell (the so-called third dredge-up or TDU episodes). There, the conditions are such that the occurrence of further mixing is strongly facilitated, due to the minimal temperature gradient. A way to induce proton mixing from the envelope (certainly not the only one) arises whenever the ambient magnetic fields expected for LMS promote the buoyancy of strongly magnetized flux tubes. I review some characteristics of the ensuing mixing episodes, mentioning how different hydrodynamical processes might yield similar effects, thus encouraging stellar physicists to verify in more detail this possibility.
© The Authors, published by EDP Sciences, 2023
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