Berkeley 22, an old and distant open cluster towards the Galactic anticentre
Astrophysics
2009-11-10 v1
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0502508,
title = {Berkeley 22, an old and distant open cluster towards the Galactic anticentre},
author = {L. Di Fabrizio and A. Bragaglia and M. Tosi and G. Marconi},
journal= {arXiv preprint arXiv:astro-ph/0502508},
year = {2009}
}
Comments
Accepted for publication on MNRAS