Other
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225.1083o&link_type=abstract
Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 1083-1089.
Other
5
Chemical Analysis, Comet Heads, Comet Tails, Molecular Ions, Water Vapor, Abundance, Ammonia, Chemical Reactions, Comet Nuclei, Dynamic Models, Methane, Transport Properties, Brightness, Emissions, Bennett, Comet, Water, Density, Analysis, Ions, Spectroscopy, Abundance, Methane, Comets, Ammonia, Spectrum, Comae, Water Ion, Chemical Composition, Element Ratios, Models
Scientific paper
Brightness profiles for emission features of H2O(+) in comet Bennett 1970 II are analyzed, taking into account the role of chemical reactions in the coma. By comparing the rates of transport processes derived from the brightness profile with known chemical rate constants, upper limits on the abundances and production rates of H2O, CH4, NH3, and other possible coma constituents are found. The derived upper limit on the H2O production rate inside 10 to the 4th power km is less than the observed OH production rate averaged over the coma of this comet. It is concluded that the brightness profiles of H2O(+) and OH in comet Bennett 1970 II which are presently available are inconsistent with production of OH primarily by photodissociation of H2O molecules sublimating from the nucleus. The existence of an extended source of H2O is not ruled out.
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