New Constraints on the Major Neutron Source in Low-mass AGB Stars
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, 13C( , n)16O in the...
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| Veröffentlicht in: | The Astrophysical journal 2018-10, Vol.865 (2), p.112 |
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| creator | Liu, Nan Gallino, Roberto Cristallo, Sergio Bisterzo, Sara Davis, Andrew M. Trappitsch, Reto Nittler, Larry R. |
| description | 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, 13C( , n)16O 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 13C-pocket. This observation provides strong support to the suggestion of deep mixing of H into the He-intershell at low 13C concentrations as a result of efficient transport of H through magnetic tubes. |
| doi_str_mv | 10.3847/1538-4357/aad9f3 |
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Based on the data-model comparison, we provide new constraints on the major neutron source, 13C( , n)16O 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 13C-pocket. This observation provides strong support to the suggestion of deep mixing of H into the He-intershell at low 13C concentrations as a result of efficient transport of H through magnetic tubes.</description><identifier>ISSN: 0004-637X</identifier><identifier>ISSN: 1538-4357</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/aad9f3</identifier><language>eng</language><publisher>Philadelphia: The American Astronomical Society</publisher><subject>ASTRONOMY AND ASTROPHYSICS ; Astrophysics ; Asymptotic giant branch stars ; circumstellar matter ; Constraint modelling ; Isotope composition ; meteorites, meteors, meteoroids ; Neutrons ; Nuclear fusion ; nuclear reactions, nucleosynthesis, abundances ; stars: AGB and post-AGB ; stars: carbon ; Tubes</subject><ispartof>The Astrophysical journal, 2018-10, Vol.865 (2), p.112</ispartof><rights>2018. The American Astronomical Society. 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This observation provides strong support to the suggestion of deep mixing of H into the He-intershell at low 13C concentrations as a result of efficient transport of H through magnetic tubes.</description><subject>ASTRONOMY AND ASTROPHYSICS</subject><subject>Astrophysics</subject><subject>Asymptotic giant branch stars</subject><subject>circumstellar matter</subject><subject>Constraint modelling</subject><subject>Isotope composition</subject><subject>meteorites, meteors, meteoroids</subject><subject>Neutrons</subject><subject>Nuclear fusion</subject><subject>nuclear reactions, nucleosynthesis, abundances</subject><subject>stars: AGB and post-AGB</subject><subject>stars: carbon</subject><subject>Tubes</subject><issn>0004-637X</issn><issn>1538-4357</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp1kM9LwzAcxYMoOKd3j0HxZl1-pznOoVOY8zAFbyHNUtbimppkDP97Wyp60dOX7-PzHo8HwDlGNzRncoI5zTNGuZwYs1YlPQCjH-kQjBBCLBNUvh2Dkxjr_iVKjcB06fZw5puYgqmaFKFvYNo4-GRqH-DS7VLolJXfBetg1cCF32dbEyOczm_hKpkQT8FRad6jO_u-Y_B6f_cye8gWz_PH2XSRWYZkymgpGDY8Lxx3pCyR4aQoJJecGVYSrDBXjljBReFYgQlVMlfKrAtspcVGEDoGF0Ouj6nS0VbJ2Y31TeNs0pgpLKjooMsBaoP_2LmYdN1Vb7pemlDBFWUilx2FBsoGH2NwpW5DtTXhU2Ok-zV1P53up9PDmp3larBUvv3NNG2tc8E10RgT3a7Ljrv-g_s39gs0qIC1</recordid><startdate>20181001</startdate><enddate>20181001</enddate><creator>Liu, Nan</creator><creator>Gallino, Roberto</creator><creator>Cristallo, Sergio</creator><creator>Bisterzo, Sara</creator><creator>Davis, Andrew M.</creator><creator>Trappitsch, Reto</creator><creator>Nittler, Larry R.</creator><general>The American Astronomical Society</general><general>IOP Publishing</general><general>Institute of Physics (IOP)</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><scope>OIOZB</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-5292-6089</orcidid><orcidid>https://orcid.org/0000-0002-0924-236X</orcidid><orcidid>https://orcid.org/0000-0002-4456-4065</orcidid><orcidid>https://orcid.org/0000-0001-9683-9406</orcidid><orcidid>https://orcid.org/0000-0001-7955-6236</orcidid><orcidid>https://orcid.org/0000-0001-7051-2931</orcidid><orcidid>https://orcid.org/0000000244564065</orcidid><orcidid>https://orcid.org/0000000196839406</orcidid><orcidid>https://orcid.org/000000020924236X</orcidid><orcidid>https://orcid.org/0000000179556236</orcidid><orcidid>https://orcid.org/0000000252926089</orcidid><orcidid>https://orcid.org/0000000170512931</orcidid></search><sort><creationdate>20181001</creationdate><title>New Constraints on the Major Neutron Source in Low-mass AGB Stars</title><author>Liu, Nan ; 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| subjects | ASTRONOMY AND ASTROPHYSICS Astrophysics Asymptotic giant branch stars circumstellar matter Constraint modelling Isotope composition meteorites, meteors, meteoroids Neutrons Nuclear fusion nuclear reactions, nucleosynthesis, abundances stars: AGB and post-AGB stars: carbon Tubes |
| title | New Constraints on the Major Neutron Source in Low-mass AGB Stars |
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