Other
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.232..507r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 232, June 1, 1988, p. 507-524.
Other
29
Carbon Monoxide, Chemical Evolution, Hydrogen, Light Curve, Novae, Stellar Mass Ejection, Black Body Radiation, Stellar Envelopes, Thermodynamic Equilibrium, Time Dependence
Scientific paper
The tentative identification by Ferland et al. (1979) and others of the 5-micron excess with CO v = 1-0 emission has provided the starting point for the study of nova chemistry. A simple model of the ionization structure of the ejecta has been adapted to take account of the effects of H2 formation and shielding. H2 formation is found to be an essential prerequisite for substantial chemistry to occur. Thus, in the regions where carbon is ionized, significant amounts of CO and other molecules cannot be formed. Time-dependent and equilibrium chemical models have been developed which take into account the ionization conditions and the effects of H2 and CO shielding. This is therefore the first attempt at the extensive chemical modeling of a hostile circumstellar environment. It is found that equilibrium is rapidly established within the ejecta (within 10s) and that the identification of CO with the 5 micron excess seems to indicate that the region of emission is a cool thin dense shell of neutral material at the edge of the ejecta.
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