A search for the millimetre lines of HCN in Comets Wilson 1987 VII and Machholz 1988 XV

Details A search for the millimetre lines of HCN in Comets Wilson 1987 VII and Machholz 1988 XV A search for the millimetre lines of HCN in Comets Wilson 1987 VII and Machholz 1988 XV

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..535c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 535-538.

Astronomy and Astrophysics

Astronomy

5

Comets, Hydrocyanic Acid, Rotational Spectra, Halley'S Comet, Hydroxyl Radicals, Millimeter Waves, Radio Telescopes, Solar System, Comets, Astronomy, Wilson, Machholz, Hydrogen Cyanide, Radiowave Methods, Earth-Based Observations, Production Rate, Comparisons, Abundance, Spectra, Water, Halley

Scientific paper

The J(1-0) lines of HCN at 89 GHz were searched for in Comet Wilson 1987 VII, with the FCRAO, the SEST and the IRAM radio telescopes between February and June 1987. There was no firm detection, but significant upper limits were obtained, which put severe constraints on the HCN production rate in that comet. A direct comparison with the observations of P/Halley suggests that the HCN abundance relative to water might be smaller in Comet Wilson by at least a factor of two. The J(1-0) and J(3-2) lines of HCN at 89 and 266 GHz were searched for in Comet Machholz 1988 XV when it was close to perihelion at 0.17 AU from the sun. There was no detection. At that moment, the comet was probably no longer active.

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