uvbyCaHBeta CCD Photometry of NGC 6253 - The Most Metal-Rich Open Cluster?

Astronomy and Astrophysics – Astronomy

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Scientific paper

As part of a program to reliably determine the fundamental characteristics - reddening, metallicity, age, and galactocentric distance - for an extended sample of open clusters, intermediate-band CCD observations of NGC 6253 have been obtained and analyzed. Analysis of the complete sample of frames demonstrates that the precision of the photometry of the turnoff region, V = 15 to 17, is more than adequate to achieve the desired accuracy of 0.01 mag in E(B-V) and 0.05 dex in [Fe/H] for the cluster. Preliminary results imply E(B-V) = 0.23, [Fe/H] = +0.35, and a galactocentric distance of approximately 7.1 kpc for a cluster with an age similar to M67. Definitive values for the parameters will be available at the poster.

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