An interstellar dust component rich in C-12

Details An interstellar dust component rich in C-12 An interstellar dust component rich in C-12

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.336..228a&link_type=abstract

Nature (ISSN 0028-0836), vol. 336, Nov. 17, 1988, p. 228-230. Research supported by SERC.

Computer Science

10

Carbon 12, Chondrites, Cosmic Dust, Interstellar Matter, Meteoritic Composition, Isotopic Enrichment, Stellar Envelopes, Stellar Evolution

Scientific paper

The results of an analysis of an acid-resistant residue from the Allende meteorite, extensively combusted in oxygen at low temperatures to remove isotopically normal carbon, is reported. The analysis reveals the presence of a small amount of carbon with a C-12/C-13 ratio close to 120, well above the value of 89 + or - 3 found in terrestrial samples or bulk meteorites. This component is denoted C-lambda. Stellar evolutionary processes favor lowering of the C-12/C13 ratio; hence C-lambda, which has a combustion temperature consistent with graphite, might be a primitive type of interstellar material.

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