https://doi.org/10.1051/epjconf/202226011009
Fluorine nucleosynthesis and s-processing in AGB stars driven by magnetic-buoyancy mixing
1 Goethe University Frankfurt, Max-von-Laue-Strasse 1, Frankfurt am Main 60438, Germany
2 INAF, Observatory of Abruzzo, Via Mentore Maggini snc, 64100 Teramo, Italy
3 INFN, Section of Perugia, Via A. Pascoli snc, 06123 Perugia, Italy
4 Department of Physics and Geology, University of Perugia, via A. Pascoli snc, 06123 Perugia, Italy
5 University of Granada, Departamento de Fisica Teorica y del Cosmos, 18071 Granada, Spain
* e-mail: vescovi@iap.uni-frankfurt.de
Published online: 24 February 2022
Asymptotic giant branch (AGB) stars are thought to be among the most important sources of fluorine in our Galaxy. While observations and theory agree at close-to-solar metallicity, stellar models overestimate fluorine production in comparison to heavy elements at lower metallicities. We present predictions for 19F abundance for a set of AGB models with various masses and metallicities, in which magnetic buoyancy induces the formation of the 13C neutron source (the so-called 13C pocket). In our new models, fluorine is mostly created as a consequence of secondary 14N nucleosynthesis during convective thermal pulses, with a minor contribution from the 14N existing in the 13C pocket zone. As a result, AGB stellar models with magnetic-buoyancyinduced mixing show low 19F surface abundances which agree with fluorine spectroscopic observations at both low and near-solar metallicity.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
