CCD photometry of the old open cluster Collinder 261
E. Gozzoli, M. Tosi, G. Marconi, A. Bragaglia
Abstract
We present UBVI photometry for the old open cluster Collinder 261. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we derive in a self consistent way reddening, distance, and age of the cluster: E(B-V)=0.25-0.34, (m-M)0=11.7-12.0, and age=7-8 Gyr or 9-11 Gyr, depending on the adopted stellar tracks. The models in better agreement with the data turn out to have metallicity at most solar.
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