Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988plas.rept....3a&link_type=abstract
In NASA, Washington, Reports of Planetary Astronomy, p 3-4 (SEE N89-16624 08-89)
Astronomy and Astrophysics
Astronomy
Comets, Emission Spectra, Fluorescence, Infrared Spectra, Spectroscopy, Spectrum Analysis, Astronomy, Hydrogen Compounds, Nitrogen Compounds, Oxygen Compounds, Sulfur Compounds
Scientific paper
Theoretical spectra of various emitting species in cometary comae were calculated both to investigate physical parameters that are measureable with cometary spectra and to provide fluorescence efficiencies for the derivation of abundances from fluxes. NH was found to be much further from nucleus than proviously thought and, because previous fluorescence efficiencies were much too high, NH is 5 times more abundant than previously thought. The spectrum of S2 in comet I-A-A was analyzed. Despite its short lifetime, S2 reaches fluorescent equlibrium. The equilibrium spectrum matches the relative band strengths in IUE spectra much better than does single cycle fluorescence. Equilibrium (but not single-cylce) flurescence also predicts strong optical emission bands which are seen in ground-based spectra of comet I-A-A. Equilibrium fluorescence efficiencies are much higher than single-cycle fluorescence efficiencies implying S2 is only half as abundant as previously estimated. Fluorescence spectrum of SO was calculated and compared with several IUE spectra including those in which Wallis and Krishna Swamy claim SO to be present. Relative intensities and shapes of bands are inconsistent with any real identification.
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