Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.201i&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
Chemical evolution of atmospheres of H2O dominant cometary nuclei, connected with production of dominant components of the atomic-molecular comas of typical comets like comet 1P/Halley, is considered analytically. The two-step photo-dissociation of water molecules sublimated from the nucleus into the field of solar electromagnetic radiation taken into account in equations of continuity for spherically-symmetrically expanding gas-dust coma. Solutions of these differential equations, giving radial distributions of atomic, molecular and dusty components of the cometary coma, are presented analytically. That may be used in studying physical and chemical processes in the cometary comas, including interpretation of phenomena detected by space missions Vega and Giotto during spacecraft encounters with comet Halley in March 1986, such as the appearance of the cometapause at a large distance from the comet nucleus as well as over-saturated vapors of ions of refractory elements like Fe+ in the cometary coma at large heliocentric distances R> 0.8-0.9 AU.
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