Abstract
THE Cygnus OB2 stellar association contains the most heavily reddened early type star known1,2. If all interstellar grains were to be removed from the line of sight to this eleventh magnitude star, it would rival Sirius as the brightest in the sky, its B–V colour excess being 3.7 magnitudes3.
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BROMAGE, G. Diffuse Interstellar Features in the Spectrum of the Most Heavily Reddened Star. Nature 230, 172–175 (1971). https://doi.org/10.1038/230172a0
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DOI: https://doi.org/10.1038/230172a0
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