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Condensation Chemistry of Circumstellar Grains

Published online by Cambridge University Press:  25 May 2016

Katharina Lodders  and
Bruce Fegley Jr.
Katharina Lodders
Affiliation:
Washington University, Campus Box 1169, St. Louis, MO 63130, USA
Bruce Fegley Jr.
Affiliation:
Washington University, Campus Box 1169, St. Louis, MO 63130, USA

Abstract

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Thermochemical equilibrium calculations are successful in predicting the mineralogy as well as the major and trace element chemistry of circumstellar grains found in meteorites. The calculations also explain observations of dust close to AGB stars (within 1–3 stellar radii). The trace element chemistry in circumstellar graphite, SiC, and other refractory carbide grains agrees with equilibrium condensation calculations for circumstellar shells of carbon stars. Observed trace element abundance patterns in N stars are complementary to those found in SiC grains indicating fractional condensation in circumstellar shells. Condensation temperatures depend upon total pressure, C/O ratio, nitrogen abundances, and overall metallicity. Therefore for condensation temperatures to be meaningful, the total pressure and elemental abundances (i.e., C/O ratio, metallicity) must be specified.

Type
Part 3. Formation, Composition, and Processing of Dust
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 279 - 290
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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