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STATISTICAL IDENTIFICATION OF BINARIES IN STAR CLUSTERS.

A technique is presented for binary systems using computer curve-fitting methods applied to the color-magnitude diagrams of individual star clusters (Hyades, Pleiades, and Praesepe). The technique seems to be dependable and free of most of the troublesome selection effects that bias other binary-star survey methods. Scatter in the color-magnitude diagram is discussed, and it is concluded that the main sequence of a galactic cluster is one dimensional within current observational error. The frequency of binaries in the analyzed clusters is discussed, and it appears that the Hyades has a somewhat higher percentage of binaries than the other two clusters. The effect of unresolved binaries on the distance determination of galactic clusters by main sequence fitting is analyzed. Key words: galactic clusters - main sequence - binary stars