Berkeley 22, an old and distant open cluster towards the Galactic anticentre

Details Berkeley 22, an old and distant open cluster towards the Galactic anticentre Berkeley 22, an old and distant open cluster towards the Galactic anticentre

2005-02-24

arxiv.org/abs/astro-ph/0502508v1

Mon.Not.Roy.Astron.Soc. 359 (2005) 966-974

Astronomy and Astrophysics

Astrophysics

Accepted for publication on MNRAS

Scientific paper

10.1111/j.1365-2966.2005.08963.x

We present deep CCD BVI photometry of the distant, old open cluster Berkeley 22, covering from the red giants branch (RGB) to about 6 magnitudes below the main sequence (MS) turn-off. Using the synthetic Colour - Magnitude Diagram method with three different types of stellar evolutionary tracks, we estimate values and theoretical uncertainty of distance modulus mod0, reddening E(B-V), age tau and approximate metallicity. The best fit to the data is obtained for 13.8 <= mod0 <= 14.1, 0.64 <= E(B-V) <= 0.65, 2 <= tau <= 2.5 Gyr (depending on the amount of overshooting from convective regions adopted in the stellar models) and solar metallicity.

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