The spectrum of Comet Austin

Details The spectrum of Comet Austin The spectrum of Comet Austin

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...253..452s&link_type=abstract

Science (ISSN 0036-8075), vol. 253, July 26, 1991, p. 452; Reply, p. 452, 453.

Computer Science

2

Austin Comet, Emission Spectra, Forbidden Transitions, Oxygen Ions, Ultraviolet Radiation, Atomic Energy Levels, Cometary Atmospheres, Optical Thickness, Spectral Line Width

Scientific paper

Green et al. (1991) note that the 1128 A transition in the UV spectrum of Comet Austin is optically forbidden due to its occurrence between two even-parity oxygen ion states. However, the 79176 A transition is equally forbidden; this line will accordingly be extremely weak, compared to the allowed transition at 11286 A. Green et al., who are criticized for dealing with the forbidden character of the 1128 A line by arguing that the cometary system is optically thick at 8446 A emission, reply to the author of the present note by emphasizing that they gave no definitive judgment on why the coma was optically thick, but only stated that they had no complete explanation for the origin of the observed emission.

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