The origin of circumstellar silicon carbide grains found in meteorites

摘要: — Condensation calculations for C-rich circumstellar envelopes are used to model the condensation sequence of C, TiC, and SiC, trace-element patterns observed in SiC grains. Some properties carbon star briefly discussed, temperatures major trace elements computed a wide array total pressure, C/O-ratios, s-process elemental abundances. The comparison calculated solid solutions with different measured by Amari et al. (1995) yields an association grains at least three groups stars.