Zr and Mo isotopic constraints on the origins of unusual types of presolar SiC grains

Details Zr and Mo isotopic constraints on the origins of unusual types of presolar SiC grains Zr and Mo isotopic constraints on the origins of unusual types of presolar SiC grains

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000lpi....31.1934p&link_type=abstract

31st Annual Lunar and Planetary Science Conference, March 13-17, 2000, Houston, Texas, abstract no. 1934

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Silicon Carbides, Supernovae, Asymptotic Giant Branch Stars, Nuclear Fusion, Zirconium Isotopes, Molybdenum Isotopes

Scientific paper

Although most presolar silicon carbide grains form in asymptotic giant branch red giant stars (the so-called mainstream grains) or supernovae (the X-grains), there are a number of other minor types of grains whose origin is less clear. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur mainly in AGB stars and supernovae, respectively, and the isotopic patterns in heavy elements in presolar grains can be used to constrain their origins. We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo and that X-grains have an unusual Mo isotopic composition that differs from s- and r-process expectations. We report here the first measurements of Zr and Mo isotopes in several grains of other rare types that were found in the same mount as the mainstream and X-grains reported previously.

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