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We studied the structure of two old open clusters, NGC 1245 and NGC 2506,from a wide and deep VI photometry data acquired using the CFH12K CCD camera atCFHT. We devised a new method for assigning cluster membership probability toindividual stars using both spatial positions and positions in thecolour-magnitude diagram. From analyses of the luminosity functions at severalcluster-centric radii and the radial surface density profiles derived fromstars with different luminosity ranges, we found that the two clusters aredynamically relaxed to drive significant mass segregation and evaporation ofsome fraction of low-mass stars. There seems to be a signature of tidal tail inNGC 1245 but the signal is too low to be confirmed.

Deep and Wide Photometry of Two Open Clusters NGC 1245 and NGC 2506: Dynamical Evolution and Halo