Multi-element isotopic analysis of single presolar SiC grains

Isotopic compositions of up to three elements (Mo, Zr, Ba) were measured on 55 presolar SiC grains from the Murchison meteorite, allowing identification of grains potentially contaminated with solar system material. The range of compositions of uncontaminated grains may constrain the amount of 13C produced in parent AGB stars to a narrow range around the amount required to explain solar system s-process abundances.