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Correlated Strontium and Barium Isotopic Compositions of Acid-Cleaned Single Mainstream Silicon Carbides from Murchison

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [4];  [1];  [9]
  1. Univ. of Chicago, IL (United States); Chicago Center for Cosmochemistry, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Chicago Center for Cosmochemistry, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  3. Univ. di Torino (Italy)
  4. Univ. of Chicago, IL (United States); Chicago Center for Cosmochemistry, IL (United States)
  5. Univ. di Torino (Italy); INAF-Osservatorio Astrofisico di Torino, Pino Torinese (Italy)
  6. Washington Univ., St. Louis, MO (United States)
  7. Inst. für Kernphysik, Karlsruhe (Germany). Karlsruhe Inst. of Technology
  8. Istituto Nazionale di Astrofisica (INAF), Teramo (Italy). Osservatorio Astronomico di Collurania; Istituto Nazionale di Fisica Nucleare (INFN)-Sezione di Napoli (Italy)
  9. TRIUMF, Vancouver, BC (Canada)
+ Show Author Affiliations
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.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
B2FH Association; Joint Institute for Nuclear Astrophysics (JINA) at Notre Dame; Karlsruhe Institute of Technology (KIT); National Aeronautic and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1356357
Alternate ID(s):
OSTI ID: 22521993
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 803; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (18)

Resonance ionization of titanium: high useful yield and new autoionizing states journal January 2018
EVOLUTION, NUCLEOSYNTHESIS, AND YIELDS OF AGB STARS AT DIFFERENT METALLICITIES. III. INTERMEDIATE-MASS MODELS, REVISED LOW-MASS MODELS, AND THE pH-FRUITY INTERFACE journal August 2015
Partial mixing and the formation of 13C pockets in AGB stars: effects on the s-process elements journal June 2017
NuGrid stellar data set – III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z= 0.01, Z = 0.02, and Z = 0.03 journal August 2019
s -PROCESSING IN AGB STARS REVISITED. II. ENHANCED 13 C PRODUCTION THROUGH MHD-INDUCED MIXING journal February 2016
GALACTIC CHEMICAL EVOLUTION: THE IMPACT OF THE 13 C-POCKET STRUCTURE ON THE s -PROCESS DISTRIBUTION journal January 2017
Nucleation of Small Silicon Carbide Dust Clusters in AGB Stars journal May 2017
The Importance of the 13 C( α ,n) 16 O Reaction in Asymptotic Giant Branch Stars journal May 2018
On the Origin of Early Solar System Radioactivities: Problems with the Asymptotic Giant Branch and Massive Star Scenarios journal August 2018
New Constraints on the Major Neutron Source in Low-mass AGB Stars journal September 2018
Nucleosynthetic Sr–Nd Isotope Correlations in Chondrites: Evidence for Nebular Thermal Processing and Dust Transportation in the Early Solar System journal July 2019
Molybdenum Isotopes in Presolar Silicon Carbide Grains: Details of s -process Nucleosynthesis in Parent Stars and Implications for r - and p -processes journal May 2019
Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins journal August 2019
Evolution, nucleosynthesis and yields of AGB stars at different metallicities (III): intermediate mass models, revised low mass models and the ph-FRUITY interface text January 2015
Galactic Chemical Evolution: the Impact of the 13C-pocket Structure on the s-process Distribution text January 2017
Nucleation of small silicon carbide dust clusters in AGB stars text January 2017
NuGrid stellar data set - III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z=0.01, Z=0.02 and Z=0.03 text January 2019
Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins text January 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
abundances – stars: AGB
circumstellar matter – meteorites
meteoroids – nuclear reactions
meteors
nucleosynthesis
post-AGB – stars: carbon