Computer Science
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sciam.249...66l&link_type=abstract
Scientific American (ISSN 0036-8733), vol. 249, Aug. 1983, p. 66-77.
Computer Science
15
Meteorites, Composition, Carbonaceous Chondrites, Source, Origin, Stony Meteorites, C Chonrites
Scientific paper
Isotopic abundances in carbonaceous chondrites (CC) are discussed in terms of the possible interstellar origins of the materials and the processes that produced them. Deposits of Ne-22 and 0-16 overabundances ruled out local solar neighborhood origins for the chondrites. The carbonaceous chondrites have been classified into C1, C2, and C3 meteorites, in descending order of their distance from the solar nebula based on the heat at which they formed. The chondrite matrix contains volatiles which have atomic properties indicative of their source. Comparisons of the isotopes of different elements provide clues to cosmic ray or stellar formation processes. Carbonaceous materials, apatite, and spinel have been identified as the Ne carriers. Fission experiments with xenon isotopes led to a hypothesis that the r process in stellar nucleosynthesis yielded the Xe component during explosive carbon burning. H-2 overabundances, indicating an origin in interstellar space, were found in polymeric substances in some CCs. It is concluded that red giants, novas, interstellar clouds, and supernovas can be investigated through studies of the elements in the CCs.
Anders Edward
Lewis Reed S.
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