title: The spectrum and spatial distribution of cyanogen in comet Hale-Bopp (C/1995 O1) at large heliocentric distance.
abstract: Optical spectra of comet Hale-Bopp (C/1995 O1) at a heliocentric distance of 6.45 astronomical units showed emission from cyanogen gas. The spatial distribution of cyanogen was considerably more diffuse and extended compared to the spatial profile of the dust or grains which were sharply peaked near the center. This behavior is consistent with comets at smaller heliocentric distances suggesting the same or a similar formation mechanism. A cyanogen gas production rate of (1.2 +/- 0.3) x10(26) molecules per second was derived. A model band profile derived from fluorescence equilibrium calculations for the comet's heliocentric velocity and distance agrees with the observed band profile.
authors.affiliation: Department of Astronomy, The Ohio State University, 174 West 18th Avenue, Columbus, OH 43210, USA. rmw@lowell.edu
authors.forename: R M
authors.initials: RM
authors.lastname: Wagner
authors.forename: D G
authors.initials: DG
authors.lastname: Schleicher
mesh_terms: D019443:Cosmic Dust; D005740:Gases; D019110:Meteoroids; D009570:Nitriles / Q000032:analysis*; D013057:Spectrum Analysis
chemical_list: D019443:Cosmic Dust; D005740:Gases; D009570:Nitriles; C011206:cyanogen