Isotopic anomalies of Ne, Xe, and C in meteorites. II. Interstellar diamond and SiC: carriers of exotic noble gases.

Details Isotopic anomalies of Ne, Xe, and C in meteorites. II. Interstellar diamond and SiC: carriers of exotic noble gases. Isotopic anomalies of Ne, Xe, and C in meteorites. II. Interstellar diamond and SiC: carriers of exotic noble gases.

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1235t&link_type=abstract

Geochimica et Cosmochimica Acta, Vol. 52, No. 5, p. 1235 - 1244

Computer Science

39

Interstellar Matter:Carbon, Meteorites:Isotopic Abundances

Scientific paper

Continuing their efforts to find the carriers of presolar noble gases, the authors isolated 15 separates from the Murray C2 chondrite on the basis of grain size and chemical resistance, and analyzed them by mass spectrometry for Ne and Xe. The data obtained show that both diamond and amorphous carbon occur as interstellar grains, along with SiC. Crystalline graphite, though long predicted as a stable stellar condensate at high C/O ratios, has not been found. Each noble-gas component is associated with only one carbon allotrope or compound, which suggests that carbon condensation in a given star is strongly selective.

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