THE REDDENING AND METALLICITY OF NGC-6791

We have investigated the reddening and metallicity of NGC 6791 using photoelectric and CCD photometry at the KPNO 0.9 m telescope. The reddenings to 31 photoelectrically measured stars in the direction of the cluster were determined individually yielding a mean E(B-V)=0.10+/-0.02. Broadband UBVI CCD images were taken with a 512x512 CCD and included deep frames on the center, plus a 3x3 mosaic of the cluster. With this reddening the UB V 2-color diagram for the cluster does, not match the standard solar-metallicity 2-color diagram. The substantial UV deficiency requires the cluster to be metal rich. Regardless of the choice of reddening value, if we make the assumption of solar metallicity for the cluster we cannot simultaneously derive a consistent fit of the 2-color diagram to standard 2-color sequences and the color-magnitude diagram to published isochrones. A comparison with solar-metallicity isochrones provides only an upper limit of approximately 10 Gyrs for the age for the cluster.