Molecular equilibria and condensation sequences in carbon rich gases

Details Molecular equilibria and condensation sequences in carbon rich gases Molecular equilibria and condensation sequences in carbon rich gases

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1281s&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1281-1282 (SEE N94-20636 05-91

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4

Asymptotic Giant Branch Stars, Carbon, Chemical Equilibrium, Condensates, Cosmic Dust, Interstellar Matter, Meteorites, Stellar Atmospheres, Aluminum Oxides, Diamonds, Graphite, High Temperature

Scientific paper

Chemical equilibria in stellar atmospheres have been investigated by many authors. Lattimer, Schramm, and Grossman presented calculations in both O rich and C rich environments and predicted possible presolar condensates. A recent paper by Cherchneff and Barker considered a C rich composition with PAH's included in the calculations. However, the condensation sequences of C bearing species have not been investigated in detail. In a carbon rich gas surrounding an AGB star, it is often assumed that graphite (or diamond) condenses out before TiC and SiC. However, Lattimer et al. found some conditions under which TiC condenses before graphite. We have performed molecular equilibrium calculations to establish the stability fields of C(s), TiC(s), and SiC(s) and other high temperature phases under conditions of different pressures and C/O. The preserved presolar interstellar dust grains so far discovered in meteorites are graphite, diamond, SiC, TiC, and possibly Al2O3.

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