Observation of the OH radio lines in Comet Okazaki-Levy-Rudenko 1989 XIX during the occultation of a point radio source

Details Observation of the OH radio lines in Comet Okazaki-Levy-Rudenko 1989 XIX during the occultation of a point radio source Observation of the OH radio lines in Comet Okazaki-Levy-Rudenko 1989 XIX during the occultation of a point radio source

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..286c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 1, Jan. 1992, p. 286-291.

Astronomy and Astrophysics

Astronomy

1

Hydroxyl Emission, Line Spectra, Occultation, Okazaki-Levy-Rudenko Comet, Point Sources, Radio Sources (Astronomy), Radio Astronomy, Spectrum Analysis

Scientific paper

While monitoring the OH radio lines in Comet Okazaki-Levy-Rudenko 1989 XIX, the occultation of a point radio source (B2 1426 + 295) at about 1 arcmin from the comet center (corresponding to about 60,000 km in the comet frame) was observed. The lines appear to be twice stronger than the average of the preceding and following days. This enhancement is not due to cometary variability, but to the increase of the continuum background, in agreement with the maser theory of the OH line excitation and with the current cometary models of OH density distribution. The variation of the signal intensity during the occultation, while the line-of-sight to the continuum source swept a path of about 50,000 km in the comet frame, suggests that either the OH distribution or the excitation of the OH radicals is not homogeneous in the coma.

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