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We present the first detailed analysis of the detached eclipsing binary V15in the super-metal rich open cluster NGC 6253. We obtain the following absoluteparameters: M_p=1.303+-0.006 Msun, R_p=1.71+-0.03 Rsun, L_p=2.98+-0.10 Lsun forthe primary, and M_s=1.225+-0.006 Msun, R_s=1.44+-0.02 Rsun, L_s=2.13+-0.06Lsun for the secondary. Based on Dartmouth isochrones, the age of NGC 6253 isestimated to be 3.80 - 4.25 Gyr from the mass-radius diagram and 3.9 - 4.6 Gyrfrom color-magnitude diagram (CMD) fitting. Both of these estimates aresignificantly higher than those reported so far. The derived apparent distancemodulus of 11.65 mag agrees well with the range of 10.9 - 12.2 mag derived byother authors; however our estimated reddening (0.113 mag) is lower than thelowest published value (0.15 mag). We confirm earlier observations that modelatmospheres are not accurate enough to account for the whole CMD of thecluster, with the largest discrepancies appearing on the subgiant and giantbranches. Although age estimation from the mass-radius diagram is a relativelysafe, distance- and reddening-independent procedure, our results should beverified by photometric and spectroscopic observations of additional detachedeclipsing binaries which we have discovered, at least two of which areproper-motion members of NGC 6253.

The Cluster AgeS Experiment (CASE). Analysis of the Detached Eclipsing Binary V15 in the Metal-Rich Open Cluster NGC 6253