Computer Science
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.339..351m&link_type=abstract
Nature (ISSN 0028-0836), vol. 339, June 1, 1989, p. 351-354. Research supported by NASA and NSF.
Computer Science
31
Chemical Evolution, Chondrites, Galactic Evolution, Interstellar Matter, Red Giant Stars, Silicon Carbides, Carbon Isotopes, Carbon Stars, Chemical Composition, Novae, Solar System, Meteorites, Silicon Carbide, Origin, Source, Chemistry, Shock Effects, Evolution, Samples, Meteorite, Carbonaceous Chondrites, Grains, Carbon, Depletion, Isotopes, Abundance, Procedure, Murchison, Laboratory Studies, Heating
Scientific paper
Interstellar silicon carbide grains in meteorites provide a novel means for studying the carbon-star population of about 5 x 10 to the 9th years ago. Their C-12/C-13 ratios differ greatly from the solar value but resemble those of present-day csrbon stars, implying little change in the galactic C-13 inventory. Isotope data on nitrogen and silicon suggest that the silicon carbide grains come mainly from red giants, with small contributions from novae.
Anders Edward
Hoppe Peter
Ming Tang
Zinner Emst
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