Magnetic and non-magnetic AGB mixing for s-processing
I outline a few features of recent models for the formation of the neutron source 13C(α,n)16O in low mass stars (1 ≲ M/M⊙ ≲ 3, LMS ) ascendingfor the second time the Red Giant Branch, generally called Asymptotic Giant Branch, or AGB stars. I also briefly outline the nucleosynthesis results obtained...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2023/01/epjconf_enas112023_01005.pdf |
| _version_ | 1828010730733961216 |
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| author | Busso Maurizio |
| author_facet | Busso Maurizio |
| author_sort | Busso Maurizio |
| collection | DOAJ |
| description | I outline a few features of recent models for the formation of the neutron source 13C(α,n)16O in low mass stars (1 ≲ M/M⊙ ≲ 3, LMS ) ascendingfor the second time the Red Giant Branch, generally called Asymptotic Giant Branch, or AGB stars. I also briefly outline the nucleosynthesis results obtained trough them. The mentioned models consider the physical structure below the frequent downward extensions of the convective envelope into the He-intershell (the so-called third dredge-up or TDU episodes). There, the conditions are such that the occurrence of further mixing is strongly facilitated, due to the minimal temperature gradient. A way to induce proton mixing from the envelope (certainly not the only one) arises whenever the ambient magnetic fields expected for LMS promote the buoyancy of strongly magnetized flux tubes. I review some characteristics of the ensuing mixing episodes, mentioning how different hydrodynamical processes might yield similar effects, thus encouraging stellar physicists to verify in more detail this possibility. |
| first_indexed | 2024-04-10T09:04:33Z |
| format | Article |
| id | doaj.art-940dbeac78504f0eaaa7d541bffbe199 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-04-10T09:04:33Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-940dbeac78504f0eaaa7d541bffbe1992023-02-21T08:06:40ZengEDP SciencesEPJ Web of Conferences2100-014X2023-01-012750100510.1051/epjconf/202327501005epjconf_enas112023_01005Magnetic and non-magnetic AGB mixing for s-processingBusso Maurizio0Department of Physics and Geology, University of Perugia, Via A. Pascoli sncI outline a few features of recent models for the formation of the neutron source 13C(α,n)16O in low mass stars (1 ≲ M/M⊙ ≲ 3, LMS ) ascendingfor the second time the Red Giant Branch, generally called Asymptotic Giant Branch, or AGB stars. I also briefly outline the nucleosynthesis results obtained trough them. The mentioned models consider the physical structure below the frequent downward extensions of the convective envelope into the He-intershell (the so-called third dredge-up or TDU episodes). There, the conditions are such that the occurrence of further mixing is strongly facilitated, due to the minimal temperature gradient. A way to induce proton mixing from the envelope (certainly not the only one) arises whenever the ambient magnetic fields expected for LMS promote the buoyancy of strongly magnetized flux tubes. I review some characteristics of the ensuing mixing episodes, mentioning how different hydrodynamical processes might yield similar effects, thus encouraging stellar physicists to verify in more detail this possibility.https://www.epj-conferences.org/articles/epjconf/pdf/2023/01/epjconf_enas112023_01005.pdf |
| spellingShingle | Busso Maurizio Magnetic and non-magnetic AGB mixing for s-processing EPJ Web of Conferences |
| title | Magnetic and non-magnetic AGB mixing for s-processing |
| title_full | Magnetic and non-magnetic AGB mixing for s-processing |
| title_fullStr | Magnetic and non-magnetic AGB mixing for s-processing |
| title_full_unstemmed | Magnetic and non-magnetic AGB mixing for s-processing |
| title_short | Magnetic and non-magnetic AGB mixing for s-processing |
| title_sort | magnetic and non magnetic agb mixing for s processing |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2023/01/epjconf_enas112023_01005.pdf |
| work_keys_str_mv | AT bussomaurizio magneticandnonmagneticagbmixingforsprocessing |