Pismis 2, a poorly studied, intermediate age open cluster
L. Di Fabrizio, A. Bragaglia, M. Tosi, G. Marconi
Abstract
We present CCD BVI photometry of the intermediate age open cluster Pismis 2, covering from the brighter red giants to about 5 magnitudes below the main sequence turn-off. The cluster is heavily reddened and is possibly affected by a differential reddening of Delta E(B-V) ~= 0.04-0.06. Using the synthetic Colour - Magnitude Diagram method, we estimate in a self-consistent way distance modulus, (n-M)0 ~= 12.5-12.7, and age ~= 1.1-1.2 Gyr. The cluster probably contains a significant fraction of binary systems. The metallicity is most likely solar and the reddening E(B-V) ranges between 1.26 and 1.32 depending on the cluster region.
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