Observations of parent molecules in comets P/Brorsen-Metcalf (1989o), Austin (1989cl) and Levy (1990c) at millimetre wavelengths: HCN, H2S, H2CO and CH3OH

Details Observations of parent molecules in comets P/Brorsen-Metcalf (1989o), Austin (1989cl) and Levy (1990c) at millimetre wavelengths: HCN, H2S, H2CO and CH3OH Observations of parent molecules in comets P/Brorsen-Metcalf (1989o), Austin (1989cl) and Levy (1990c) at millimetre wavelengths: HCN, H2S, H2CO and CH3OH

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.315..143b&link_type=abstract

In ESA, Formation of Stars and Planets, and the Evolution of the Solar System p 143-148 (SEE N91-18922 10-90)

Astronomy and Astrophysics

Astronomy

18

Abundance, Chemical Composition, Cometary Atmospheres, Comets, Millimeter Waves, Comet Heads, Comet Nuclei, Comet Tails, Hydrogen Sulfide, Methyl Alcohol, Organic Compounds, Radio Astronomy

Scientific paper

Millimeter observations conducted with a radio astronomy 30 m telescope on comets P/Brorsen-Metcalf (1989o) on September 1989, Austin (1989cl) on April and May 1990, and Levy (1990c) on August 1990 at Pico Veleta in Spain, are discussed. Two species are detected for the first time in a comet: hydrogen sulfide (H2S) and methanol (CH3OH). Rotational transitions of HCN and H2CO are also detected. Preliminary estimates of molecular abundances are presented. Searches for SO2, OCS, H2CS and HC3N, although negative, give significant constraints on the abundances of these molecules. These observations may help to resolve whether comets are formed from unaltered interstellar material.

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