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Abstract
ABSTRACT Intercomparison of the Michigan Catalogue of Two-Dimensional Spectral Types with a uniform survey of southern open clusters by van der Bergh and Hagen shows that about 6 percent of Fand G-type supergiants of luminosity classes la, Iab, and Ib are cluster members. The most-luminous supergiants are more likely to be cluster members than are less-luminous supergiants.
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