UBVRI CCD photometry of the old open cluster NGC 6253

Details UBVRI CCD photometry of the old open cluster NGC 6253 UBVRI CCD photometry of the old open cluster NGC 6253

1996-08-26

arxiv.org/abs/astro-ph/9608167v2

Astronomy and Astrophysics

Astrophysics

13 pages, plain LaTeX, uses mn.sty, 12 .ps figures, also available at http://www.bo.astro.it/bap/BAPhome.html or from ftp://

Scientific paper

We present UBVRI photometry for the old open cluster NGC 6253. 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) = 0.23-0.32, (m-M)$_0$ = 10.9$\pm$0.1, metallicity roughly double than solar, and age $\simeq$ 3 Gyr. The cluster has a binary sequence, discernible even through the field contamination, suggesting that about 1/3 of the cluster members belong to binary, or multiple, systems.

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