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We describe a technique to identify Be stars in open clusters using Stromgrenb, y, and narrow-band Halpha photometry. We first identify the B-type stars ofthe cluster using a theoretical isochrone fit to the (b-y, y) color-magnitudediagram. The strongest Be stars are easily identified in a (b-y, y-Halpha)color-color diagram, but those with weaker Halpha emission (classified aspossible Be star detections) may be confused with evolved or foreground stars.Here we present such photometry plus Halpha spectroscopy of members of thecluster NGC 3766 to demonstrate the accuracy of our technique. Statisticalresults on the relative numbers of Be and B-type stars in additional clusterswill be presented in a future paper.Comment: 15 pages, 6 figures, 1 table. Accepted by Ap

A Photometric Method to Search for Be Stars in Open Clusters