THE REDDENING AND METALLICITY OF NGC-6791

We have investigated the reddening and metallicity of NGC 6791 using p hotoelectric and CCD photometry at the KPNO 0.9 m telescope. The redde nings to 31 photoelectrically measured stars in the direction of the c luster 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 thi s reddening the UB V 2-color diagram for the cluster does, not match t he standard solar-metallicity 2-color diagram. The substantial UV defi ciency requires the cluster to be metal rich. Regardless of the choice of reddening value, if we make the assumption of solar metallicity fo r 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 i sochrones provides only an upper limit of approximately 10 Gyrs for th e age for the cluster.