On the ammonia abundance in the coma of Halley's Comet

Details On the ammonia abundance in the coma of Halley's Comet On the ammonia abundance in the coma of Halley's Comet

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..513m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 1, 1988, p. 513-517.

Astronomy and Astrophysics

Astrophysics

27

Abundance, Ammonia, Cometary Atmospheres, Halley'S Comet, Comet Nuclei, Electron Density Profiles, Photoionization, Solar Flux, Ultraviolet Radiation, Water

Scientific paper

Consideration is given to recent work by Allen et al. (1987) which suggests that the value of the ratio of the abundance of the atomic masses 19 to 18 observed in situ in the inner coma of Comet Halley is incompatible with a pure H2O nucleus and requires an NH3 abundance of 1-2 percent. The present authors discuss possible ways of explaining the radial profile of r = 19/18, which deemphasizes the presence of NH3. It is shown that the observed value of the 19/18 mass ratio in the inner coma does not necessarily imply the existence of a significant abundance of NH3. An elevated UV flux, for which there is circumstantial evidence, could produce the same effect.

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