Abstract
THE absence of detectable emission nebulae is a feature characteristic of many clusters and associations1,2. Among such associations is Cygnus OB2, which contains several hundred OB stars and ∼ 100 M⊙ of dust in circumstellar shells, but no H II region1,3. Assuming a normal gas to dust ratio, the association must contain ∼ 104 M⊙ of interstellar hydrogen which should give rise to an H II region with an emission measure ∼ 105–106.
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WICKRAMASINGHE, N., REDDISH, V. Accretion of Solid Hydrogen Mantles by Grains in OB Associations. Nature 218, 661–662 (1968). https://doi.org/10.1038/218661a0
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DOI: https://doi.org/10.1038/218661a0
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