view Abstract Citations (86) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectrophotometry of 17 comets. I - The emission features Newburn, R. L. ; Spinrad, H. Abstract 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. Publication: The Astronomical Journal Pub Date: February 1984 DOI: 10.1086/113512 Bibcode: 1984AJ.....89..289N Keywords: 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; Astrophysics; Comets full text sources ADS |