Computer Science
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.330..728b&link_type=abstract
Nature (ISSN 0028-0836), vol. 330, Dec. 24, 1987, p. 728-730. NSF-NASA-supported research.
Computer Science
169
Carbonaceous Meteorites, Chondrites, Interstellar Matter, Murray Meteorite, Silicon Carbides, Stellar Envelopes, Raman Spectra, Rare Gases, Meteorites, Stony Meteorites, Carbonaceous Chondrites, Samples, Meteorite, Murray, Silicon Carbide, Enrichment, Isotopes, Anomalies, Xenon, Neon, Grains, Size, Compositon, Origin, Formation, Nitrogen, Photomicrographs, Sem, Electron Microscopy, Laboratroy Studies, Tem, Spectra, Edx, Eels, Cm2 Chondrites, Procedure, Description, Rare Gases
Scientific paper
Silicon carbide has been identified in two separates from the Murray carbonaceous chondrite that are enriched 20,000-fold in isotopically anomalous neon and xenon. The SiC is present in the form of crystalline grains 0.1-1 micron in size. Cubic and 111-plane-twinned cubic are the most common ordered polytypes observed so far. The anomalous isotopic composition of its carbon, nitrogen, and silicon indicates a presolar origin, probably in the atmospheres of red giants. An additional silicon- and oxygen-rich phase shows large isotropic anomalies in nitrogen and silicon, also associated with a presolar origin.
Anders Edward
Bernatowicz T.
Fraundorf G.
Fraundorf Philip
Ming Tang
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