Correlated Strontium and Barium Isotopic Compositions of Acid-Cleaned Single Mainstream Silicon Carbides from Murchison
Abstract
Herein we present strontium, barium, carbon, and silicon isotopic compositions of 61 acid-cleaned presolar SiC grains from Murchison. Comparison with previous data shows that acid washing is highly effective in removing both strontium and barium contamination. For the first time, by using correlated 88Sr/86Sr and 138Ba/136Ba ratios in mainstream SiC grains, we are able to resolve the effect of 13C concentration from that of 13C-pocket mass on s-process nucleosynthesis, which points toward the existence of large 13C pockets with low 13C concentrations in asymptotic giant branch stars. The presence of such large 13C pockets with a variety of relatively low 13C concentrations seems to require multiple mixing processes in parent asymptotic giant branch stars of mainstream SiC grains.
- Authors:
-
[1];
[8];
- Univ. of Chicago, IL (United States); Chicago Center for Cosmochemistry, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Chicago Center for Cosmochemistry, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Univ. di Torino (Italy)
- Univ. of Chicago, IL (United States); Chicago Center for Cosmochemistry, IL (United States)
- Univ. di Torino (Italy); INAF-Osservatorio Astrofisico di Torino, Pino Torinese (Italy)
- Washington Univ., St. Louis, MO (United States)
- Inst. für Kernphysik, Karlsruhe (Germany). Karlsruhe Inst. of Technology
- Istituto Nazionale di Astrofisica (INAF), Teramo (Italy). Osservatorio Astronomico di Collurania; Istituto Nazionale di Fisica Nucleare (INFN)-Sezione di Napoli (Italy)
- TRIUMF, Vancouver, BC (Canada)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Aeronautics and Space Administration (NASA); Joint Institute for Nuclear Astrophysics (JINA) at Notre Dame; Karlsruhe Institute of Technology (KIT); B2FH Association
- OSTI Identifier:
- 1356357
- Grant/Contract Number:
- AC02-06CH11357; RBFR08549F-002; PRIN-MIUR 2012
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 803; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; abundances – stars: AGB; circumstellar matter – meteorites; meteoroids – nuclear reactions; meteors; nucleosynthesis; post-AGB – stars: carbon
Citation Formats
Liu, Nan, Savina, Michael R., Gallino, Roberto, Davis, Andrew M., Bisterzo, Sara, Gyngard, Frank, Käppeler, Franz, Cristallo, Sergio, Dauphas, Nicolas, Pellin, Michael J., and Dillmann, Iris. Correlated Strontium and Barium Isotopic Compositions of Acid-Cleaned Single Mainstream Silicon Carbides from Murchison. United States: N. p., 2015.
Web. doi:10.1088/0004-637X/803/1/12.
Liu, Nan, Savina, Michael R., Gallino, Roberto, Davis, Andrew M., Bisterzo, Sara, Gyngard, Frank, Käppeler, Franz, Cristallo, Sergio, Dauphas, Nicolas, Pellin, Michael J., & Dillmann, Iris. Correlated Strontium and Barium Isotopic Compositions of Acid-Cleaned Single Mainstream Silicon Carbides from Murchison. United States. https://doi.org/10.1088/0004-637X/803/1/12
Liu, Nan, Savina, Michael R., Gallino, Roberto, Davis, Andrew M., Bisterzo, Sara, Gyngard, Frank, Käppeler, Franz, Cristallo, Sergio, Dauphas, Nicolas, Pellin, Michael J., and Dillmann, Iris. Fri .
"Correlated Strontium and Barium Isotopic Compositions of Acid-Cleaned Single Mainstream Silicon Carbides from Murchison". United States. https://doi.org/10.1088/0004-637X/803/1/12. https://www.osti.gov/servlets/purl/1356357.
@article{osti_1356357,
title = {Correlated Strontium and Barium Isotopic Compositions of Acid-Cleaned Single Mainstream Silicon Carbides from Murchison},
author = {Liu, Nan and Savina, Michael R. and Gallino, Roberto and Davis, Andrew M. and Bisterzo, Sara and Gyngard, Frank and Käppeler, Franz and Cristallo, Sergio and Dauphas, Nicolas and Pellin, Michael J. and Dillmann, Iris},
abstractNote = {Herein we present strontium, barium, carbon, and silicon isotopic compositions of 61 acid-cleaned presolar SiC grains from Murchison. Comparison with previous data shows that acid washing is highly effective in removing both strontium and barium contamination. For the first time, by using correlated 88Sr/86Sr and 138Ba/136Ba ratios in mainstream SiC grains, we are able to resolve the effect of 13C concentration from that of 13C-pocket mass on s-process nucleosynthesis, which points toward the existence of large 13C pockets with low 13C concentrations in asymptotic giant branch stars. The presence of such large 13C pockets with a variety of relatively low 13C concentrations seems to require multiple mixing processes in parent asymptotic giant branch stars of mainstream SiC grains.},
doi = {10.1088/0004-637X/803/1/12},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 803,
place = {United States},
year = {Fri Apr 10 00:00:00 EDT 2015},
month = {Fri Apr 10 00:00:00 EDT 2015}
}
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