Abstract
The open cluster NGC 6231, core of the association Sco OB 1, is a very unusual group of stars due to the presence of two WolfRayet stars and two Of stars ( Struve 1944; Holopov 1951 ) . Several papers dealing with photoelectric data have been published (Brownlee and Cox 1953; Breckinridge and Kron 1963; Bok, Bok and Graham 1966). Struve (1944) measured radial velocities of 20 stars in and near the cluster, and later, Morgan, Code and Whitford (1953) and Houck (1956) classified some of them on the MK system.
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