Abstract
The applicability of photographic photometry in the Washington photometric system is established. It is found for a sample of 37 stars in the cluster NGC 6882/5 that the mean photographic and photoelectric colors differ by typically 0.02-0.03 m. While this difference precludes the use of photography to determine accurate abundances for individual stars, the accuracy becomes acceptable when several stars are averaged. Abundances derived from C-M are determined to be both more precise and in better agreement with photoelectric values than those derived from M - T1. It is shown that the effective temperature can be determined to within 150-200 K of the photoelectric value. It is concluded that solid state detectors of sufficient photometric precision will greatly improve the utility of two-dimensional Washington photometry.
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