Yan, M.Dalgarno, A.Klemperer, W.Miller, A. E. S.2019-09-272000Yan, M., A. Dalgarno, W. Klemperer, and A. E. S. Miller. 2000. “The CO Cameron Band Emission in the Red Rectangle.” Monthly Notices of the Royal Astronomical Society 313 (2): L17–18. https://doi.org/10.1046/j.1365-8711.2000.03421.x.0035-87111365-2966http://nrs.harvard.edu/urn-3:HUL.InstRepos:41417378The origin of the strong CO Cameron band emission in the Red Rectangle is investigated. From a comparison of laboratory spectroscopic data and astronomical observations in combination with chemical modelling, it is concluded that the Cameron band emission of CO originates from the dissociative recombination of HCO+, and its intensity provides a measure of the product of the density of HCO+ ions and the electron density, integrated along the line of sight.en-USJournal Article2019-09-2710.1046/j.1365-8711.2000.03421.x