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In color-magnitude diagrams of many globular and galactic clusters several stars are found located approximately on the main sequence but at considerably brighter absolute magnitudes than the vast majority of main sequence stars in the cluster. A few examples occur in the globular clusters M 13 1 and M 10, 2 and numerous such stars are present in M 3. 3,4 Galactic clusters having one or more stars lying above the turn-off point of the main sequence are NGC 752, 5 NGC 7789, 6 and M 67. 7 All ofdoi:10.1086/127422 fatcat:qunfjfck45evbbg3si6oxm7yoi