UBVI photometry of the intermediate age open cluster NGC 6939
Gloria Andreuzzi, Angela Bragaglia, Monica Tosi, Gianni Marconi
Abstract
We present CCD UBVI photometry of the nearby, intermediate age open cluster NGC 6939. Using the synthetic Colour - Magnitude Diagrams technique we estimate the following parameters: age between 1.3 and 1.0 Gyr (depending on whether or not overshooting is considered), reddening 0.34<E(B-V)<0.38 and distance modulus 11.3<mod0<11.4 .
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