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Interstellar carbon in meteorites.

P K Swart, M M Grady, C T Pillinger

    Science (New York, N.Y.)
    |April 22, 1983
    PubMed
    Summary
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    Meteorites contain "heavy" carbon from interstellar grains and a second component with "light" carbon, possibly from local or exotic origins. This research analyzes the isotopic composition of carbon and noble gases in chondrites.

    Area of Science:

    • Cosmochemistry
    • Astrochemistry
    • Isotope Geochemistry

    Background:

    • Murchison and Allende meteorites contain significant amounts of carbon.
    • Isotopic analysis reveals anomalies in carbon and noble gases within these meteorites.

    Purpose of the Study:

    • To investigate the origin of anomalous carbon and noble gas components in chondrites.
    • To determine if these components represent interstellar grains or local/exotic sources.

    Main Methods:

    • Isotopic analysis of carbon, neon, krypton, and xenon.
    • Comparison of isotopic ratios with terrestrial and known stellar processes.

    Main Results:

    • A "heavy" carbon component (enriched in carbon-13) is associated with Ne-22 and s-process-like Kr and Xe, suggesting an interstellar origin from late-type stars.

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  • A second anomalous xenon component ("CCFXe") is linked to "light" carbon (depleted in carbon-13), falling within the terrestrial range.

    • Conclusions:

    • The "heavy" carbon and associated noble gases likely originate from presolar interstellar grains.
    • The origin of the "light" carbon component remains ambiguous, potentially being local or exotic.