SIMBAD references

2006MNRAS.368.1971B - Mon. Not. R. Astron. Soc., 368, 1971-1981 (2006/June-1)

BVI photometry of the very old open cluster Berkeley 17.


Abstract (from CDS):

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 (CMDs) 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 per cent level. All these values have been obtained using models with metallicity about half of solar (Z = 0.008 or 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.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): Hertzsprung-Russell (HR) diagram - open clusters and associations: general - open clusters and associations: individual: Berkeley17

Simbad objects: 13

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