Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..925n&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, Aug. 1, 1981, p. 925-935.
Astronomy and Astrophysics
Astrophysics
20
Carbon Monoxide, Interstellar Gas, Molecular Clouds, Molecular Excitation, Silicon Oxides, Vibrational Spectra, Chemical Composition, Diatomic Molecules, Gas Pressure, Gas Temperature, Novae, Planetary Nebulae, Pressure Dependence, Stellar Atmospheres, Stellar Envelopes, Temperature Dependence, Thermodynamic Equilibrium
Scientific paper
Steady state vibrational populations of SiO and CO in several dilute blackbody radiation fields have been calculated as a function of total pressure, kinetic temperature, and chemical composition of the gas. An approximate calculation for polyatomic molecules has also been carried out. Vibrational disequilibrium becomes increasingly significant as the total pressure and radiation density decrease. Many regions of postulated grain formation are found to be far out of thermal equilibrium before the onset of condensation. The use of classical nucleation theory and equilibrium thermodynamics to predict the onset of condensation and the composition of the solids or the molecular composition of the gas phase in such regions therefore is very questionable and needs to be examined for each case.
Donn Bertram
Nuth Joseph A.
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