THE unidentified interstellar absorption band at 4430 Å is well known in reddened early-type stars in the Galaxy. Indications of its presence have been found on microphotometer tracings of Radcliffe spectra of stars belonging to the Magellanic Clouds, including the most heavily reddened known members of the Large and Small Cloud. A sample tracing appears in Fig. 1. The bands are, as usual, so wide and shallow that no precise measure of wave-length is possible, but from the 11 best tracings a mean central wave-length of 4425 ± 10 Å, relative to the stellar absorption lines, is found. The 4 deepest bands have central depths ranging from 6 to 10 per cent.
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HUTCHINGS, J. 4430 Å Absorption in Magellanic Cloud Stars. Nature 202, 992 (1964). https://doi.org/10.1038/202992a0
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