Fluorine nucleosynthesis and s-processing in AGB stars driven by magnetic-buoyancy mixing

  • 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.

Download full text files

Export metadata

Author:Diego VescoviORCiD, Sergio CristalloORCiD, Sara PalmeriniORCiD, Carlos AbiaGND, Maurizio BussoORCiD
Parent Title (English):EPJ Web of Conferences
Publisher:EDP Sciences
Place of publication:Les Ulis
Document Type:Article
Date of Publication (online):2022/02/24
Date of first Publication:2022/02/24
Publishing Institution:Universit├Ątsbibliothek Johann Christian Senckenberg
Contributing Corporation:The 16th International Symposium on Nuclei in the Cosmos (NIC-XVI)
Release Date:2022/09/28
Page Number:3
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 4.0