Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..456i&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 1, 1986, p. 456-460.
Astronomy and Astrophysics
Astrophysics
7
Atmospheric Heating, Cometary Atmospheres, Condensing, Drops (Liquids), Photodissociation, Comet Nuclei, Gas Expansion, Radiant Cooling, Water Temperature, Comets, Comae, Photochemistry, Heating, Water, Condensation, Droplets, Comet Nuclei, Thermodynamics, Hyrodynamics, Infrared, Cooling, Gases, Sublimation, Formation, Atmosphere, Injection, Velocity
Scientific paper
The recent suggestion of recondensation of icy water droplets in the vicinity of cometary nuclei is followed up by investigation of the thermodynamics and hydrodynamics in the inner comae. It is found that, if the IR radiative cooling effect is negligible, the heating effect due to resublimation of H2O molecules from the icy droplets could maintain the gas temperature (T about 75 K) relatively higher than the values previously estimated (T about 10 K) in the inner coma. Furthermore, the mass-loading effect of the H2O gas injected in the icy droplet zone would produce a minimum in the radial velocity. Formation of icy water droplets therefore could have very significant effects on the atmospheric expansion of cometary comae.
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