Condensation and molecular abundances in stellar atmopheres

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 is 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 the above elements in carbon rich composition reduce significantly with condensation. Surprisingly, the abundances of molecules containing S, F and Cl in solar composition and Q, S, F and Cl in carbon rich composition are enhanced with condensation but abundances of molecules containing CO, such as H2CO and HCO, in carbon rich composition hardly varies.