Abstract
Interstellar silicon carbide grains in meteorites provide a novel means for studying the carbon-star population of about 5 × 109 years ago. Their 12C/13C ratios differ greatly from the solar value but resemble those of present-day carbon stars, implying little change in the galactic 13C inventory. Isotope data on nitrogen and silicon suggest that the silicon carbide grains come mainly from red giants, with small contributions from novae.
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Ming, T., Anders, E., Hoppe, P. et al. Meteoritic silicon carbide and its stellar sources; implications for galactic chemical evolution. Nature 339, 351–354 (1989). https://doi.org/10.1038/339351a0
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DOI: https://doi.org/10.1038/339351a0
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