Interstellar carbon in meteorites

Details Interstellar carbon in meteorites Interstellar carbon in meteorites

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...220..406s&link_type=abstract

Science (ISSN 0036-8075), vol. 220, April 22, 1983, p. 406-410. Research supported by the Science and Engineering Research Counc

Computer Science

88

Abundance, Carbon 13, Carbonaceous Chondrites, Interstellar Matter, Meteoritic Composition, Carbon 12, Combustion, Rare Gases, Stellar Mass Ejection, Xenon Isotopes, Meteorites, Carbon, Murchison Meteorite, Allende Meteorite, Chondrites, Enrichment, Gases, Anomalies, Krypton, Xenon, Origin, Isotopes, Source, Deuterium, Rare Gases, Data, Isotopic Ratios, Experiments, Grains, Composition, Abundance

Scientific paper

The Murchison and Allende chondrites contain up to 5 parts per million carbon that is enriched in carbon-13 by up to +1100 per mil (the ratio of carbon-12 to carbon-13 is approximately 42, compared to 88 to 93 for terrestrial carbon). This 'heavy' carbon is associated with neon-22 and with anomalous krypton and xenon showing the signature of the s-process (neutron capture on a slow time scale). It apparently represents interstellar grains ejected from late-type stars. A second anomalous xenon component ('CCFXe') is associated with a distinctive, light carbon (depleted in carbon-13 by 38 per mil), which, however, falls within the terrestrial range and hence may be of either local or exotic origin.

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