skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

We report Mo isotopic data of 27 new presolar SiC grains, including 12 N-14-rich AB (N-14/N-15 > 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 C-13 and N-14 excesses but no s-process enhancements and are thus potential stellar sources of AB2 grains. 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.

Authors:
ORCiD logo; ORCiD logo; ; ; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo;
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); National Aeronautic and Space Administration (NASA); Lawrence Livermore National Laboratory
OSTI Identifier:
1416981
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: The Astrophysical Journal. Letters; Journal Volume: 844; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
meteoroids; AGB and post-AGB; abundances; circumstellar matter; meteorites; meteors; nuclear reactions; nucleosynthesis; stars: carbon; stars: dwarf novae

Citation Formats

Liu, Nan, Stephan, Thomas, Boehnke, Patrick, Nittler, Larry R., Alexander, Conel M. O’D., Wang, Jianhua, Davis, Andrew M., Trappitsch, Reto, and Pellin, Michael J. J-type Carbon Stars: A Dominant Source of 14 N-rich Presolar SiC Grains of Type AB. United States: N. p., 2017. Web. doi:10.3847/2041-8213/aa7d4c.
Liu, Nan, Stephan, Thomas, Boehnke, Patrick, Nittler, Larry R., Alexander, Conel M. O’D., Wang, Jianhua, Davis, Andrew M., Trappitsch, Reto, & Pellin, Michael J. J-type Carbon Stars: A Dominant Source of 14 N-rich Presolar SiC Grains of Type AB. United States. doi:10.3847/2041-8213/aa7d4c.
Liu, Nan, Stephan, Thomas, Boehnke, Patrick, Nittler, Larry R., Alexander, Conel M. O’D., Wang, Jianhua, Davis, Andrew M., Trappitsch, Reto, and Pellin, Michael J. Thu . "J-type Carbon Stars: A Dominant Source of 14 N-rich Presolar SiC Grains of Type AB". United States. doi:10.3847/2041-8213/aa7d4c.
@article{osti_1416981,
title = {J-type Carbon Stars: A Dominant Source of 14 N-rich Presolar SiC Grains of Type AB},
author = {Liu, Nan and Stephan, Thomas and Boehnke, Patrick and Nittler, Larry R. and Alexander, Conel M. O’D. and Wang, Jianhua and Davis, Andrew M. and Trappitsch, Reto and Pellin, Michael J.},
abstractNote = {We report Mo isotopic data of 27 new presolar SiC grains, including 12 N-14-rich AB (N-14/N-15 > 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 C-13 and N-14 excesses but no s-process enhancements and are thus potential stellar sources of AB2 grains. 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.},
doi = {10.3847/2041-8213/aa7d4c},
journal = {The Astrophysical Journal. Letters},
number = 1,
volume = 844,
place = {United States},
year = {Thu Jul 20 00:00:00 EDT 2017},
month = {Thu Jul 20 00:00:00 EDT 2017}
}