Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/32969
Title: | Presolar silicon carbide grains of types Y and Z: their strontium and barium isotopic compositions and stellar origins | Authors: | Liu, Nan Stephan, Thomas CRISTALLO, Sergio VESCOVI, DIEGO Gallino, Roberto Nittler, Larry R. Alexander, Conel M.O’ D. Davis, Andrew M. |
Issue Date: | 2022 | Journal: | THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI | Number: | 58 | Issue: | 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 |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2209.10347.pdf | preprint | 7.21 MB | Adobe PDF | View/Open |
Liu_2022_EPJA_58_216.pdf | [Administrators only] | 1.85 MB | Adobe PDF |
Page view(s)
32
checked on Aug 31, 2024
Download(s)
12
checked on Aug 31, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.