Correlated SI isotope anomalies and large C-13 enrichments in a family of exotic SiC grains

Details Correlated SI isotope anomalies and large C-13 enrichments in a family of exotic SiC grains Correlated SI isotope anomalies and large C-13 enrichments in a family of exotic SiC grains

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..570s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 107, no. 3-4, Dec. 1991, p. 570-581.

Astronomy and Astrophysics

Astrophysics

34

Carbon 13, Carbonaceous Chondrites, Nuclear Astrophysics, Silicon Carbides, Silicon Isotopes, Isotopic Enrichment, Mineralogy, Murchison Meteorite, Nuclear Fusion, Stellar Physics

Scientific paper

A hypothesis is presented to the effect that the distinctive morphological characteristics and comparatively simple Si isotope systematics identify the platy SiC crystals as a genetically related family, formed around a single isotopically heterogeneous presolar star on an association of related stars. The enrichments in C-13 and the Si isotope systematics of the platy SiC are broadly consistent with theoretical models of nucleosynthesis in low-mass, carbon stars on the ASG. The Si isotope array most plausibly reflects mixing between (Si-28)-rich material, inherited from a previous generation of stars, and material enriched in Si-29 and Si-30, produced in intershell regions by neutron capture during He-burning. The absence of a correlation between the Si and C isotopic compositions of the SiC suggests either episodic condensation of SiC, extending over several thermal pulses, in the atmosphere of a single star, or the derivation of the SiC from several stars characterized by different rates of C-13 production.

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