Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..289n&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Feb. 1984, p. 289-309.
Astronomy and Astrophysics
Astronomy
78
Astronomical Photometry, Comets, Emission Spectra, Spectrophotometry, Abundance, Carbon, Chemical Composition, Cyanogen, Image Dissector Tubes, Comets, Catalog, Spectrophotometry, Astronomy, Observations, Emissions, Features, Imagery, Density, Composition, Chemistry, Comparisons, Borrelly, Swift-Gehrels
Scientific paper
112 sets of image dissector scanner data were obtained at Lick Observatory from 17 comets during a 2.5-yr period, 1980 - 1982. Results obtained include column densities for CN, C3, CH, C2, and [O I], new Haser parent scale lengths for CN, C3, and C2, and a large body of data on the composition of cometary comae as a function of heliocentric distance. Particularly notable is the well-defined C2 to CN ratio, which decreases roughly as r-1.4 out to r ≅ 1.8 AU and then falls precipitously. Although there is considerable chemical uniformity in most comets studied, two (P/Borrelly and P/Swift-Gehrels) appear significantly deficient in both C2 and C3. The apparent systematics within the crude Haser paradigm offer suggestions for more realistic chemical modelling studies.
Newburn Ray L.
Spinrad Hyron
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