Accretion of Solid Hydrogen Mantles by Grains in OB Associations

Details Accretion of Solid Hydrogen Mantles by Grains in OB Associations Accretion of Solid Hydrogen Mantles by Grains in OB Associations

May 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.218..661w&link_type=abstract

Nature, Volume 218, Issue 5142, pp. 661-662 (1968).

Physics

40

Scientific paper

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 Msolar of dust in circumstellar shells, but no H II region1,3. Assuming a normal gas to dust ratio, the association must contain ~ 104 Msolar of interstellar hydrogen which should give rise to an H II region with an emission measure ~ 105-106.

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