Radio observations of the OH line in Comet Halley

Details Radio observations of the OH line in Comet Halley Radio observations of the OH line in Comet Halley

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988cha%26a..12..324l&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 12, Issue 4, p. 324-327.

Astronomy and Astrophysics

Astrophysics

Scientific paper

From March 31 to April 4 and from April 13 to 17, the 1667 MHz OH line of comet Halley was observed in Shaanxi province of China with the 25B radio telescope of Shanghai Observatory and a 128-channel autocorrelation spectrometer of Peking University. The bandwidth of the spectrometer was 625 KHz and the resolution was 4.92 KHz (0.89 km/s). The receiver was frequency-switched with a frequency shift of 197 KHz. In order to improve the signal-to-noise ratio, we accumulated the 1667 MHz profiles of April 13 to 17. According to the synthetic profile, we can summarize the results as follows:
(1) The intensity of the absorbed OH flux was calibrated by means of measurements of the 1667 MHz OH line of W12. The observed mean OH flux of 4 days is -2.4 Jy.
(2) The measured OH expansion velocity VOh = 0.92 km/s, when the heliocentric distance rh = 1.39 AU.
(3) The profile asymmetry may be characterized by the first order moment Δv= 0.20 km/s.
(4) The mean OH parent production rate Qp = 1.7 × 1029 mol/s, assuming Hasser's model with the parameters defined in Despois et al.

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