Computer Science
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...91..251l&link_type=abstract
Icarus (ISSN 0019-1035), vol. 91, June 1991, p. 251-269.
Computer Science
9
Cometary Atmospheres, Halley'S Comet, Line Spectra, Neutral Gases, Water, Coma, Cosmochemistry, Photochemical Reactions, Spectral Energy Distribution
Scientific paper
The spatial distribution and expansion velocity of the Comets Wilson (1987 VII) and pre- and postperihelion P/Halley are derived on the bases of velocity-resolved H2O spectral line profiles, using a kinematic model which synthesizes line profiles for comparison with observed line shapes. The results thus obtained demonstrate that the spherically symmetric outflow at constant velocity is a poor characterization of cometary neutral-gas outflow. While the radial dependence of the H2O expansion velocity is noted to be consistent with theoretically envisioned trends, the high H2O outflow velocity observed in Comet Wilson resists reconciliation with any existing kinematic model.
Hsieh K. C.
Hu Hong-Yao
Larson Harold P.
Mumma Michael J.
Weaver Harold A.
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