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http://hdl.handle.net/20.500.12386/32969
Titolo: | Presolar silicon carbide grains of types Y and Z: their strontium and barium isotopic compositions and stellar origins | Autori: | Liu, Nan Stephan, Thomas CRISTALLO, Sergio VESCOVI, DIEGO Gallino, Roberto Nittler, Larry R. Alexander, Conel M.O’ D. Davis, Andrew M. |
Data pubblicazione: | 2022 | Rivista: | THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI | Numero: | 58 | Fascicolo: | 11 | Abstract: | We report the Sr and Ba isotopic compositions of 18 presolar SiC grains of types Y (11) and Z (7), rare types commonly argued to have formed in lower-than-solar metallicity asymptotic giant branch (AGB) stars. We find that the Y and Z grains show higher 88Sr/87Sr and more variable 138Ba/136Ba ratios than mainstream (MS) grains. According to FRANEC Torino AGB models, the Si, Sr, and Ba isotopic compositions of our Y and Z grains can be consistently explained if the grains came from low-mass AGB stars with 0.15 Z⊙ ≤ Z < 1.00 Z⊙, in which the 13C neutron exposure for the slow neutron-capture process is greatly reduced with respect to that required by MS grains for a 1.0 Z⊙ AGB star. This scenario is in line with the previous finding based on Ti isotopes, but it fails to explain the indistinguishable Mo isotopic compositions of MS, Y, and Z grains. | URI: | http://hdl.handle.net/20.500.12386/32969 | URL: | https://api.elsevier.com/content/abstract/scopus_id/85141782303 https://link.springer.com/article/10.1140/epja/s10050-022-00838-z |
ISSN: | 1434-6001 | DOI: | 10.1140/epja/s10050-022-00838-z | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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