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We present an empirical method to derive photometric metallicity, reddeningand distance to old stellar populations by using a few major features of theRed Giant Branch (RGB) in near IR color magnitude diagrams. We combine theobserved RGB features with a set of equations linking the global metallicity[M/H] to suitable RGB parameters (colors, magnitudes and slope), as calibratedfrom a homogeneous sample of Galactic Globular Clusters with differentmetallicities. This technique can be applied to efficiently derive the mainpopulation parameters of old stellar systems, in the view of using ground-basedadaptive optics and space facilities to probe the stellar content of remotegalaxies.Comment: 16 pages, 4 figures, accepted for pubblication on Ap

An Empirical Tool to Derive Metallicity, Reddening, and Distance for Old Stellar Populations from Near‐Infrared Color‐Magnitude Diagrams