Surface and Internal Structure of Pristine Presolar Silicon Carbide

摘要

Silicon carbide is the most well-studied type of presolar grain. Isotope measurements of thousands and structural data from over 500 individual grains have been reported. The isotope data indicate that approximately 98% originated in asymptotic giant branch stars and 2% in supernovae. Although tens of different polytypes of SiC are known to form synthetically, only two polytypes have been reported for presolar grains.