Radio observation of comet Meier /1978f/ in 18-cm OH lines

Details Radio observation of comet Meier /1978f/ in 18-cm OH lines Radio observation of comet Meier /1978f/ in 18-cm OH lines

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85.1276g&link_type=abstract

Astronomical Journal, vol. 85, no. 1-2, Sept. 1980, p. 1276-1280. NASA-supported research.

Astronomy and Astrophysics

Astronomy

3

Comets, Hydroxyl Emission, Line Spectra, Molecular Excitation, Radio Astronomy, Abundance, Astronomical Spectroscopy, Circular Polarization, Hydroxyl Radicals, Ion Production Rates, Normal Density Functions, Radial Velocity, Radiant Flux Density, Comets, Meier Comet, Radio Astronomy, Observations, Spectrum, Comae, Models, Data, Procedure, Production Rate, Hydroxyl Ion, Emissions, Comparisons, Density, Ultraviolet, Flux, Analysis, Water

Scientific paper

Observations of 18-cm OH spectral lines in comet Meier (1978f) with the 1000-ft. Arecibo telescope show spatial resolution of the OH coma by the 2.9 arcmin beam (=3.7 x 10 to the 5th km). The data agree with predictions of the solar Fraunhofer spectrum-pumping theory of comet OH excitation. On the assumption that the OH parent molecule (e.g., H2O) has a Haser-model scale length of about 1.0 x 10 to the 5th km at heliocentric distance 1 AU, an OH scale length of less than 10 to the 6th km, and probably near 1.0 x 10 to the 5th km is derived. Assuming a recently calculated value of the OH lifetime and the solar radiative pumping model, the results indicate an OH production rate of 10 to the 29th Kayser at heliocentric distance 2 AU.

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