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 Conferences |
| 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: | Universitätsbibliothek 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: | Universitätspublikationen |
| Licence (German): |  Creative Commons - Namensnennung 4.0 |
