Radio observations of the hydroxyl radical in comets with high spectral resolution - Kinematics and asymmetries of the OH coma in C/Meier (1978 XXI), C/Bradfield (1979X), and C/Austin (1982g)

Details Radio observations of the hydroxyl radical in comets with high spectral resolution - Kinematics and asymmetries of the OH coma in C/Meier (1978 XXI), C/Bradfield (1979X), and C/Austin (1982g) Radio observations of the hydroxyl radical in comets with high spectral resolution - Kinematics and asymmetries of the OH coma in C/Meier (1978 XXI), C/Bradfield (1979X), and C/Austin (1982g)

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131..111b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 1, Feb. 1984, p. 111-122.

Astronomy and Astrophysics

Astronomy

42

Comets, Hydroxyl Emission, Outgassing, Radio Astronomy, Brightness Distribution, Coma, High Resolution, Kinematics, Radial Velocity, Radio Spectra, Spectrum Analysis, Comets, Astronomy, Radio Observations, Hydroxyl Radical, Resolution, Spectra, Kinematics, Asymmetry, Comae, Meier, Bradfield, Austin, Velocity, Brightness, Distribution, Monte Carlo Techniques, Models, Outgassing, Comet Nuclei, Emissions

Scientific paper

The 1667 MHz transition of OH was studied with high velocity resolution (0.3 km/s) in comets C/Meier (1978 XXI), C/Bradfield (1979X), and C/Austin (1982g). Asymmetries were generally observed both in the velocity profile and in the East-West brightness distribution. The spectra with minimum asymmetry were analysed with a vectorial model using a Monte Carlo approach. Satisfactory fits are obtained with (1) monokinetic, (2) Gaussian, (3) Maxwellian velocity distributions of the OH parent molecule. The radial outflow model (Haser) with a monokinetic parent molecule is excluded by the data. The asymmetries were interpreted qualitatively in terms of anisotropic outgassing of the nucleus. There is no indication of an anomalous outflow velocity of the parent molecule when the percentage of anisotropic outgassing is large. A rough orientation of the outgassing is given.

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