An icy comet halo and the temperature of the inner coma

Details An icy comet halo and the temperature of the inner coma An icy comet halo and the temperature of the inner coma

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pazh...11..475b&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 11, June 1985, p. 475-480) Soviet Astronomy Letters (ISSN 0360-0327), vol. 11, May-June

Astronomy and Astrophysics

Astronomy

1

Astronomical Models, Comet Nuclei, Cometary Atmospheres, Gas Temperature, Halos, Ice, Atmospheric Temperature, Halley'S Comet, Hydrodynamic Equations

Scientific paper

A spherically symmetric hydrodynamic model for an inner coma composed of water vapor and water-ice grains ejected from the nucleus surface is calculated for a comet whose nucleus produces gas at a moderate rate (such as Halley's Comet) at 1 AU heliocentric distance. Out to radii of about 1000 km from the nucleus, the coma will be effectively thick in the H2O rotational lines, so the Shimizu mechanism of radiative cooling in those lines may be neglected. The deep gas-temperature minimum in the inner coma predicted by previous hydrodynamic models will be rendered much shallower if the comet has an icy halo.

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