Molecular obserations of comets P/Giacobini-Zinner 1984e and P/Halley 1982i at millimetre wavelengths

Details Molecular obserations of comets P/Giacobini-Zinner 1984e and P/Halley 1982i at millimetre wavelengths Molecular obserations of comets P/Giacobini-Zinner 1984e and P/Halley 1982i at millimetre wavelengths

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...180..253b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 180, no. 1-2, June 1987, p. 253-262.

Astronomy and Astrophysics

Astrophysics

37

Cyano Compounds, Giacobini-Zinner Comet, Halley'S Comet, Millimeter Waves, Molecular Spectra, Radio Spectra, Astronomical Spectroscopy, Cometary Atmospheres, Line Spectra, Methyl Compounds, Molecular Rotation, Comets, Halley, Giacobini-Zinner, Molecules, Wavelengths, Infrared, Hydrogen Cyanide, Radio Methods, Earth-Based Observations, Velocity, Production Rate, Solar Radiation, Atmosphere, Kinematics, Photolysis, Models, Hypotheses, Heating, Comae, Telescope Methods, Parameters, Spectra, Spectroscopy, Compo

Scientific paper

The authors searched for rotational lines of HCN in comet P/Giacobini-Zinner, and of HCN, HC3N, CH3CN, CO and OCS in comet P/Halley, using the IRAM 30-m millimetre radio telescope. The J = 1→0 lines of HCN were detected in comet P/Halley during the 1985 Nov. 19 - Dec. 3 and 1986 Feb. 10 - 12 periods. The molecular production rates or their limits are computed using a model based on infrared solar excitation and collisional excitation. The HCN production rates of P/Halley were ≅ 7×1025s-1 during the first period and ≅ 3×1027s-1 during the second one. These rates present strong day-to-day variations. The HCN line shapes give primary information on the kinematics of the inner cometary atmosphere. The HCN linewidths provide a direct determination of the coma expansion velocity, which was ≡0.85 km s-1 at 1.5 AU from the Sun, and ≡1.35 km s-1 at perihelion (0.6 AU). This increase in velocity might be due to a larger and more efficient photolytic heating of the coma at small heliocentric distances.

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