BVI photometry of the very old open cluster Berkeley 17

Details BVI photometry of the very old open cluster Berkeley 17 BVI photometry of the very old open cluster Berkeley 17

2006-03-02

arxiv.org/abs/astro-ph/0603050v1

Mon.Not.Roy.Astron.Soc.368:1971-1981,2006

Astronomy and Astrophysics

Astrophysics

In press on MNRAS. Figs 1, 8, 9 at degraded resolution

Scientific paper

10.1111/j.1365-2966.2006.10266.x

We have obtained BVI CCD imaging of Berkeley 17, an anticentre open cluster that competes with NGC 6791 as the oldest known open cluster. Using the synthetic colour magnitude diagrams (CMD) technique with three sets of evolutionary tracks we have determined that its age is 8.5 - 9.0 Gyr, it distance modulus is (m-M)_0 = 12.2, with a reddening of E(B-V) = 0.62 - 0.60. Differential reddening, if present, is at the 5 % level. All these values have been obtained using models with metallicity about half of solar (Z=0.008 or Z=0.01 depending on the stellar evolution tracks), which allows us to reproduce the features of the cluster CMD better than other metallicities. Finally, from the analysis of a nearby comparison field we think to have intercepted a portion of the disrupting Canis Major dwarf galaxy.

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