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