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.

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Author:Diego VescoviORCiD, Sergio CristalloORCiD, Sara PalmeriniORCiD, Carlos AbiaGND, Maurizio BussoORCiD
URN:urn:nbn:de:hebis:30:3-699418
DOI:https://doi.org/10.1051/epjconf/202226011009
ISSN:2100-014X
Parent Title (English):EPJ Web of Confereces
Publisher:EDP Sciences
Place of publication:Les Ulis
Document Type:Article
Language:English
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
Volume:260
Issue:11009
Page Number:3
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universit├Ątspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0