Abstract
THE interstellar absorption band at λ4430 has been examined on a number of high quality image-tube spectra taken at Edinburgh. The spectra were analysed by the automated spectrophotometric method developed by Thompson1 and the data reduced with the Observatory's Elliott 4130 computer. The profile of the band has been measured, and an interesting new feature, namely, a slight emission band at about λ4400, to the violet of the principal absorption band, has been discovered which cannot be accounted for by instrumental effects and which we take to be a real feature of the interstellar band. We describe here the spectra, their method of reduction and the results.
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