This work is based on data collected at the European Southern Observatory (ESO) telescopes under programme 076.D-0119.
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The anticentre old open clusters Berkeley 27, Berkeley 34 and Berkeley 36: new additions to the BOCCE project†
Article first published online: 26 JUN 2012
DOI: 10.1111/j.1365-2966.2012.21289.x
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Issue
Monthly Notices of the Royal Astronomical Society
Volume 424, Issue 2, pages 1132–1148, August 2012
Additional Information
How to Cite
Donati, P., Bragaglia, A., Cignoni, M., Cocozza, G. and Tosi, M. (2012), The anticentre old open clusters Berkeley 27, Berkeley 34 and Berkeley 36: new additions to the BOCCE project. Monthly Notices of the Royal Astronomical Society, 424: 1132–1148. doi: 10.1111/j.1365-2966.2012.21289.x
- †
Publication History
- Issue published online: 13 JUL 2012
- Article first published online: 26 JUN 2012
- Accepted 2012 May 10. Received 2012 May 10; in original form 2012 April 16
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Keywords:
- Hertzsprung–Russell and colour–magnitude diagrams;
- Galaxy: disc;
- open clusters and associations: general;
- open clusters and associations: individual: Berkeley 27;
- open clusters and associations: individual: Berkeley 34;
- open clusters and associations: individual: Berkeley 36
ABSTRACT
In this paper, we present the investigation of the evolutionary status of three open clusters: Berkeley 27, Berkeley 34 and Berkeley 36, all located in the Galactic anticentre direction. All of them were observed with SUperb Seeing Imager 2 at the New Technology Telescope using the Bessel B, V and I filters. The cluster parameters have been obtained using the synthetic colour–magnitude diagram (CMD) method, i.e. the direct comparison of the observational CMDs with a library of synthetic CMDs generated with different evolutionary sets (Padova, FRANEC and FST). This analysis shows that Berkeley 27 has an age between 1.5 and 1.7 Gyr, a reddening E(B−V) in the range 0.40–0.50 and a distance modulus (m−M)0 between 13.1 and 13.3; Berkeley 34 is older with an age in the range 2.1–2.5 Gyr, E(B−V) between 0.57 and 0.64 and (m−M)0 between 14.1 and 14.3; Berkeley 36, with an age between 7.0 and 7.5 Gyr, has a reddening of E(B−V) ∼ 0.50 and a distance modulus (m−M)0 between 13.1 and 13.2. For all the clusters, our analysis suggests a subsolar metallicity in accord with their position in the outer Galactic disc.