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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.

The anticentre old open clusters Berkeley 27, Berkeley 34 and Berkeley 36: new additions to the BOCCE project ★