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http://hdl.handle.net/20.500.12386/27486
Title: | New Constraints on the Major Neutron Source in Low-mass AGB Stars | Authors: | Liu, Nan Gallino, Roberto CRISTALLO, Sergio Bisterzo, Sara Davis, Andrew M. Trappitsch, Reto Nittler, Larry R. |
Issue Date: | 2018 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 865 | Issue: | 2 | First Page: | 112 | Abstract: | We compare updated Torino postprocessing asymptotic giant branch (AGB) nucleosynthesis model calculations with isotopic compositions of mainstream SiC dust grains from low-mass AGB stars. Based on the data-model comparison, we provide new constraints on the major neutron source, <SUP>13</SUP>C(α, n)<SUP>16</SUP>O in the He-intershell, for the s-process. We show that the literature Ni, Sr, and Ba grain data can only be consistently explained by the Torino model calculations that adopt the recently proposed magnetic-buoyancy-induced <SUP>13</SUP>C-pocket. This observation provides strong support to the suggestion of deep mixing of H into the He-intershell at low <SUP>13</SUP>C concentrations as a result of efficient transport of H through magnetic tubes. | URI: | http://hdl.handle.net/20.500.12386/27486 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/aad9f3 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/aad9f3 | Bibcode ADS: | 2018ApJ...865..112L | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Liu_2018_ApJ_865_112.pdf | Pdf editoriale | 1.39 MB | Adobe PDF | View/Open |
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