Observations of the OH radical in comets at 18 CM wavelength

Details Observations of the OH radical in comets at 18 CM wavelength Observations of the OH radical in comets at 18 CM wavelength

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...47..464b&link_type=abstract

(International Astronomical Union and American Astronomical Society, Colloquium on Comets: Gases, Ices, Grains, and Plasma, 61st

Astronomy and Astrophysics

Astronomy

30

Centimeter Waves, Comets, Hydroxyl Radicals, Molecular Spectra, Radio Astronomy, Brightness Distribution, Comet Nuclei, Fluorescence, Line Spectra, Molecular Energy Levels, Molecular Excitation, Outgassing, Comets, Observations, Hydroxyl Radical, Centimeter Waves, Telescopic Observations, Meier Comet, Bradfield Comet, P/Encke Comet, Analysis, Kinematics, Comae, Velocity, Distance, Asymmetry, Outgassing, Comet Nuclei, Brightness, Models, Ultraviolet, Fluorescence, Comparisons, Production Rate, Parent Molecul

Scientific paper

Recent observations are presented of the OH radical at a wavelength of 18 cm in comets Meier (1978 XXI), Bradfield (1979 X), Meier (1980q), P/Encke (1980), and Bradfield (1980t). The expansion velocity of the OH molecules is found to be approximately 1.5 km/sec at rh equals 1 AU and to decrease with increasing heliocentric distance. The line profile is for the most part asymmetric, which demonstrates the Greenstein effect on the fluorescent excitation mechanism and/or anisotropic outgassing of the nucleus. In several cases, especially for comet Meier (1978 XXI), an asymmetry is also found in the east-west brightness distribution of the OH line, again showing the Greenstein effect and/or anisotropic outgassing.

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