A model of a comet coma with interstellar molecules in the nucleus

Details A model of a comet coma with interstellar molecules in the nucleus A model of a comet coma with interstellar molecules in the nucleus

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108..221b&link_type=abstract

Astronomy and Astrophysics, vol. 108, no. 2, Apr. 1982, p. 221-226. Research supported by the U.S. Department of Energy and NAS

Astronomy and Astrophysics

Astrophysics

31

Astronomical Models, Comet Nuclei, Interstellar Matter, Molecular Clouds, Abundance, Carbon, Chemical Composition, Coma, Halley'S Comet, Interstellar Chemistry, Reaction Kinetics, Comets, Comae, Models, Molecules, Comet Nuclei, Composition, Carbon, Ice, Observations, Comparisons, Cyanide, Ammonia, Abundance, Kinetics, Chemistry, Parameters, Volatiles, Distance, Density, Production Rates

Scientific paper

The coma of a comet is modeled assuming the icy nucleus contains interstellar molecules. This composition overcomes discrepancies between observation and earlier model predictions for CN, C2, C3, and NH2 abundances. It is found that the abundances of CN, C2, and C3-bearing compounds in the nucleus must be constrained to trace amounts in order to account for the observed column densities. NH3 also cannot be abundant by more than about 1%. The model gives good agreement with observed relative ranges of neutral species in the coma as well as with their observed relative intensity dependence on heliocentric distance. The size of the nucleus and the heliocentric ranges considered are relevant to comet Halley.

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