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Condensation and Molecular Abundances in Stellar Atmospheres

Published online by Cambridge University Press:  04 August 2017

S. P. Tarafdar
S. P. Tarafdar*
Affiliation:
Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400005 India

Abstract

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Equilibrium calculation containing 211 species of 22 elements has been used to study the effect of condensation on molecular abundances as a function of temperature (T) and pressure (P). The condensation of 162 species are tested and 65 species in solar composition and 64 in a C-rich composition have been found to condense. The calculations show the expected result that the abundances of molecules containing condensable elements like Si, Al, Mg, Fe, Zr and Ti in solar composition and C together with above elements in carbon rich composition reduce significantly with condensation. Surprisingly, the abundances of molecules containing S, F and Cl in solar composition and O, S, F and Cl in carbon rich composition are enhanced with condensation but abundances of molecules containing CO like H2CO, HCO in carbon rich composition hardly varies.

Type
Grains
Information
Symposium - International Astronomical Union , Volume 120: Astrochemistry , 1987 , pp. 559 - 564
Copyright
Copyright © Reidel 1987 

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