The $^{13}C$-pockets in AGB Stars and Their Fingerprints in Mainstream SiC Grains

摘要

We identify three isotopic tracers that can be used to constrain the$^{13}C$-pocket and show the correlated isotopic ratios of Sr and Ba in singlemainstream presolar SiC grains. These newly measured data can be explained bypostprocess AGB model calculations with large $^{13}C$-pockets with a range ofrelatively low $^{13}C$ concentrations, which may suggest that multiple mixingprocesses contributed to the $^{13}C$-pocket formation in parent AGB stars.