Old open clusters: UBGVRI photometry of NGC 2506
arXiv:astro-ph/9707076 · doi:10.1093/mnras/291.4.763
Abstract
UBGVRI photometry for the open cluster NGC 2506 is presented. 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)=0-0.07, (m-M)o = 12.6, age = 1.5-2.2 Gyr. The cluster shows a well definite secondary sequence, suggesting that binary systems constitute about 20 % of the cluster members visible in the colour-magnitude diagram.
11 pages, 7 figures, MNRAS latex style, accepted
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