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http://hdl.handle.net/20.500.12386/31552
Titolo: | Magnetic-buoyancy-induced mixing in AGB stars: Fluorine nucleosynthesis at different metallicities | Autori: | VESCOVI, Diego CRISTALLO, Sergio Palmerini, S. Abia, C. Busso, M. |
Data pubblicazione: | 2021 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 652 | Da pagina:: | A100 | Abstract: | Asymptotic giant branch (AGB) stars are considered to be among the most significant contributors to the fluorine budget in our Galaxy. While observations and theory agree at close-to-solar metallicity, stellar models at lower metallicities overestimate the fluorine production with respect to that of heavy elements. We present <SUP>19</SUP>F nucleosynthesis results for a set of AGB models with different masses and metallicities in which magnetic buoyancy acts as the driving process for the formation of the <SUP>13</SUP>C neutron source (the so-called <SUP>13</SUP>C pocket). We find that <SUP>19</SUP>F is mainly produced as a result of nucleosynthesis involving secondary <SUP>14</SUP>N during convective thermal pulses, with a negligible contribution from the <SUP>14</SUP>N present in the <SUP>13</SUP>C pocket region. A large <SUP>19</SUP>F production is thus prevented, resulting in lower fluorine surface abundances. As a consequence, AGB stellar models with mixing induced by magnetic buoyancy at the base of the convective envelope agree well with available fluorine spectroscopic measurements at low and close-to-solar metallicity. | URI: | http://hdl.handle.net/20.500.12386/31552 | URL: | https://www.aanda.org/articles/aa/abs/2021/08/aa41173-21/aa41173-21.html http://arxiv.org/abs/2106.08241v1 |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/202141173 | Bibcode ADS: | 2021A&A...652A.100V | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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