Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..987t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 15, 1987, p. 987-991.
Astronomy and Astrophysics
Astronomy
10
Astronomical Photometry, Giacobini-Zinner Comet, Halley'S Comet, Molecular Interactions, Visible Spectrum, Abundance, Fraunhofer Lines, Ultraviolet Spectra, Comets, Giacobini-Zinner, Halley, Spectrophotometry, Astronomy, Flux, Brightness, Comparisons, Molecular Processes, Radicals, Wavelengths, Earth-Based Observations, Telescope Methods, Distance
Scientific paper
Optical window spectrophotometry was performed on comets Giacobini-Zinner and Halley over the interval 300-1000 nm. Band and band-sequence fluxes were obtained for the brightest features of OH, CN, NH, and C2, special care having been given to determinations of extinction, instrumental sensitivities, and corrections for Fraunhofer lines. C2 Swan band-sequence flux ratios were determined with unprecedented accuracy and compared with the predictions of the detailed equilibrium models of Krishna Swamy et al. (1977, 1979, 1981, and 1987). It is found that these band sequences do not agree with the predictions, which calls into question the assumptions made in deriving the model, namely resonance fluorescence statistical equilibrium. Suggestions are made as to how to resolve this discrepancy.
O'Dell Charles Robert
Tegler Stephen C.
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