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Title: J-type Carbon Stars: A Dominant Source of 14 N-rich Presolar SiC Grains of Type AB

Journal Article · · The Astrophysical Journal. Letters (Online)
 [1];  [2];  [2];  [1];  [1];  [1];  [3];  [4];  [4]
  1. Carnegi Inst. for Science, Washington, DC (United States). Dept. of Terrestrial Magnetism
  2. Univ. of Chicago, IL (United States). Dept. of Geophysical Sciences; Chicago Center for Cosmochemistry, Chicago, IL (United States)
  3. Univ. of Chicago, IL (United States). Dept. of Geophysical Sciences.; Chicago Center for Cosmochemistry, Chicago, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division
  4. Univ. of Chicago, IL (United States). Dept. of Geophysical Sciences, Enrico Fermi Inst.; Chicago Center for Cosmochemistry, Chicago, IL (United States)
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Here, we report Mo isotopic data of 27 new presolar SiC grains, including 12 14N-rich AB (14N/15N > 440, AB2) and 15 mainstream (MS) grains, and their correlated Sr and Ba isotope ratios when available. Direct comparison of the data for the MS grains, which came from low-mass asymptotic giant branch (AGB) stars with large s-process isotope enhancements, with the AB2 grain data demonstrates that AB2 grains show near-solar isotopic compositions and lack s-process enhancements. The near-normal Sr, Mo, and Ba isotopic compositions of AB2 grains clearly exclude born-again AGB stars, where the intermediate neutron-capture process (i-process) takes place, as their stellar source. On the other hand, low-mass CO novae and early R- and J-type carbon stars show 13C and 14N excesses but no s-process enhancements and are thus potential stellar sources of AB2 grains. And because both early R-type carbon stars and CO novae are rare objects, the abundant J-type carbon stars (10%–15% of all carbon stars) are thus likely to be a dominant source of AB2 grains.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC52-07NA27344; NNX10AI63G; NNX15AF78G
OSTI ID:
1414353
Report Number(s):
LLNL-JRNL-732767; TRN: US1800686
Journal Information:
The Astrophysical Journal. Letters (Online), Vol. 844, Issue 1; ISSN 2041-8213
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (9)

Cometary Dust journal March 2018
Presolar grains in primitive ungrouped carbonaceous chondrite Northwest Africa 5958 journal October 2019
The presolar grain inventory of fine‐grained chondrule rims in the Mighei‐type ( CM ) chondrites journal November 2019
Structural Investigation of Silicon Carbide X Grains: Constraints on Condensation in Supernova Ejecta journal November 2018
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
Isotopic Signatures of Supernova Nucleosynthesis in Presolar Silicon Carbide Grains of Type AB with Supersolar 14 N/ 15 N Ratios journal December 2019
Cometary Dust text January 2018
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
58 GEOSCIENCES
circumstellar matter
meteorites
meteors
meteorides
nucleosynthesis
abundances
stars: AGB and post AGB
stars: carbon
stars: dwarf novae