Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.555z&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 555
Other
Chemical Reactions, Interstellar Matter, Mass Spectroscopy, Meteoritic Composition, Nuclear Fusion, Stellar Evolution, Ion Probes, Metallicity, Radioactive Isotopes, Stellar Atmospheres, Trace Elements
Scientific paper
Primitive meteorites contain small amounts of interstellar dust grains that survived the formation of the solar system. Since these grains formed in stellar atmospheres, their study can provide information on nuclear and chemical processes in stars. To date, diamond, SiC, graphite, TiC, and corundum have been identified. Their circumstellar origin is indicated by their extremely anomalous isotopic compositions, originally of noble gases, but subsequently also of the major and refractory minor and trace elements. While diamond and TiC are too small for single-grain analysis, SiC, graphite, and corundum range up to greater than 1 micron in size and isotopic ratios can be measured for several elements by ion microprobe spectrometry. The correlated isotopic data thus obtained set new constraints on theoretical models of nucleosynthesis and stellar evolution. One type of information to be culled from isotopic measurements of interstellar grains is on the number of stellar sources that contributed material to the solar system. Another type of information is obtained from single-grain isotopic data that either have no counterpart in astronomical observations or that cannot be explained by existing models of nucleosynthesis and thus provide stimulation for further theoretical work. An example are large O-18 depletions in corundum grains from Tieschitz. Another example are large O-18 excesses in graphite grains.
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