A Singular Presolar SIC Grain with Extreme ^29SI and ^30SI Excesses

Details A Singular Presolar SIC Grain with Extreme ^29SI and ^30SI Excesses A Singular Presolar SIC Grain with Extreme ^29SI and ^30SI Excesses

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...517l..59a&link_type=abstract

The Astrophysical Journal, Volume 517, Issue 1, pp. L59-L62.

Astronomy and Astrophysics

Astronomy

13

Ism: Dust, Extinction, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Supernovae: General

Scientific paper

An ion-imaging search of presolar SiC grains from the Murchison meteorite revealed one grain whose isotopic ratios are highly unusual: ^12C/^13C = 844+/-34, ^14N/^15N = 213+/-21, ^29Si/^28Si = (3.68+/-0.02) times solar, and ^30Si/^28Si = (4.29+/-0.04) times solar. Although several populations of presolar SiC grains have been identified, most of which originate in low-mass asymptotic giant branch stars, this is the first grain of its kind among ~20,000 SiC grains analyzed to date. Type II supernovae and Wolf-Rayet O binary systems are possible stellar sources.

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