Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..425b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 425-430.
Astronomy and Astrophysics
Astrophysics
36
Halley'S Comet, Molecular Excitation, Spectral Bands, Water, Cometary Atmospheres, Infrared Spectra, Molecular Rotation, Vibrational Spectra
Scientific paper
In order to interpret infrared observations of parent molecules in comets, an excitation model which takes into account excitation by collisions, pumping of the fundamental bands of vibration by the infrared solar radiation field, and radiation trapping in the rotatinal and rovibrational lines has been developed. This model makes it possible to derive infrared synthetic spectra for various species. It is applied here to interpret recent infrared observations of water in comet P/Halley. The saturation of the 2.7-micron water band observed by the IKS instrument on Vega is evaluated. The relative water line intensities observed by KAO in March 1986 are well fitted by the model, when a coma kinetic temperature of about 60 K is assumed in the r greater than about 1000 km region.
Bockelée-Morvan Dominique
Crovisier Jacques
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