A photometric study of the old open clusters Berkeley 73, Berkeley 75 and Berkeley 25

Abstract

CCD BVI photometry of the faint open clusters Berkeley~73, Berkeley~75 and Berkeley~25 are presented. The two latter are previously unstudied clusters to our knowledge. While Berkeley~73 is found to be of intermediate-age (about 1.5 Gyr old), Berkeley~75 and Berkeley~25 are two old clusters, with ages larger than 3.0 Gyr. We provide also estimates of the clusters size. Very interestingly, all these clusters turn out to lie far away from the Galactic Center, at $R_{GC}\ge$ 16 kpc, and quite high onto the Galactic plane, at $|Z_{\odot }|\ge 1.5$ kpc. They are therefore important targets to probe the properties of the structure of the Galaxy in this direction, where the Canis Major over-density has been recently discovered to be located.

8 pages, 10 figures, in press in A&A

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• On Rings and Streams in the Galactic Anti-Center
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• Abundances and kinematics for ten anticentre open clusters
• Photometry of seven overlooked open clusters in the First and Fourth Galactic Quadrants
• Radial Velocities of Three Poorly Studied Clusters and the Kinematics of Open Clusters
• Photometry of the five marginally studied open clusters Collinder 74, Berkeley 27, Haffner 8, NGC 2509 and VdB-Hagen 4
• Photometry of a Galactic field at l = 232, b = -6. The old open cluster Auner 1, the Norma-Cygnus spiral arm and the signature of the warped Galactic Thick Disk
• Fundamental parameters of six neglected old open clusters
• Stellar populations in the Canis Major over-density
• An analysis of the most distant catalogued open clusters -- Re-assessing fundamental parameters with Gaia EDR3 and $\text{ASteCA}$
• CCD $UBV(RI{)}_C$ Photometry of Twenty Open Clusters
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• Photometry of the Four Anti-Galactocentric Old Open Clusters: Czernik 30, Berkeley 34, Berkeley 75, and Berkeley 76