Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334.1044b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 1044-1048.
Astronomy and Astrophysics
Astrophysics
7
Halley'S Comet, Ice, Spectral Bands, Spectrophotometry, Water Vapor, Emission Spectra, Iue, Solar Radiation, Wave Scattering
Scientific paper
Structure has been observed in the 3 - 3.6 μm preperihelion spectrum of comet Halley consistent with either an absorption band near 3.1 μm or emission near 3.3 μm. If the data are interpreted as showing an absorption band, then the data are consistent with absorption by ice particles of solar radiation scattered by a gray scattering component. The absence of a long-wavelength wing on the absorption feature indicates that the ice grain radii are smaller than ≡0.5 μm. The depth of the absorption band corresponds to 1×1018H2O molecules cm-2 as ice, and a vaporization rate for the nucleus of 3.6×1028H2O molecules s-1, about 30% of the H2O production rate measured by the IUE. These observational results suggest that a large fraction of the H2O molecules lost by the comet are initially ejected in the form of small ice particles rather than in the gas phase.
Bregman Jesse D.
Rank David M.
Tielens Alexander G. G. M.
Witteborn Fred. C.
Wooden Diane
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