Other
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246..208r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 246, NO.2/SEP15, P. 208, 1990
Other
12
Scientific paper
The detection of CO in SN 1987 A represents the first evidence of molecule formation in the ejecta of a supernova. The region of CO emission is apparently highly hydrogen-deficient. Results from a fully time-dependent chemical model indicate that CO is the only molecule likely to achieve in appreciable fractional abundance and in particular CO^+^ : CO < 1 at late times (i.e. t> 100 d post-outburst). The CO is not sensitive to the physical conditions other than the UV flux intensity. In order to account for the high CO abundance that is observed, the UV radiation field must be reduced by at least a 10^2^ factor from the calculated upper limit value. This may indicate the presence of spatial and compositional inhomogeneity in the ejecta. Alternatively, the radiation field may have been severely overestimated in this model, in which case the CO abundance is essentially determined by the level of helium ionization. Unless there is a drastic change in the physical conditions, the CO abundance is expected to stay high. The model indicates that different physical conditions apply outside the CO-metal-rich core region.
Rawlings M. C. J.
Williams David. A.
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