Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..747g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, March 1987, p. 747-752.
Astronomy and Astrophysics
Astronomy
10
Halley'S Comet, Hydroxyl Emission, Radio Spectra, Gas Jets, Line Spectra, Radiant Flux Density, Ultrahigh Frequencies, Comets, Halley, Hydroxyl Radical, Earth-Based Observations, Astronomy, Radio Methods, Spectrometry, Spectra, Procedure, Flux, Bursts, Gases, Emissions, Water, Production Rates, Distribution, Density, Comae, Symmetry, Anisotropy, Data Reduction
Scientific paper
From October 5, 1985 to March 26, 1986 and again from April 30 to May 29, the 1.667 GHz OH line in Comet Halley was observed almost continuously with the Dominion Radio Astrophysical Observatory's 25.6 m antenna and a digital autocorrelation spectrometer. Spectra covered the velocity range + or - 5.6 km/s with a resolution of 0.18 km/s. A Gaussian curve was fitted to each daily averaged spectrum to determine peak flux, width, and velocity of the line whenever signal-to-noise ratio permitted. A plot of peak line flux against time shows frequent outbursts superimposed on the slow variations predicted by Schloerb and Gerard (1985). In at least two instances, bursts of enhanced emission lasting about six days rose above the predicted levels. Several spectra show asymmetries which could be attributed to anisotropic release of gas.
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