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We present an analysis of three southern open star clusters NGC 6067, NGC2506 and IC 4651 using wide-field photometric and Gaia DR2 astrometric data.They are poorly studied clusters. We took advantage of the synergy between GaiaDR2 high precision astrometric measurements and ground based wide-fieldphotometry to isolate cluster members and further study these clusters. Weidentify the cluster members using proper motions, parallax andcolour-magnitude diagrams. Mean proper motion of the clusters in RA and DEC isestimated as -1.90 \pm 0.01 and -2.57 \pm 0.01 mas/yr for NGC 6067, -2.57 \pm0.01 and 3.92 \pm 0.01 mas/yr for NGC 2506 and -2.41 \pm 0.01 and -5.05 \pm0.02 mas/yr for IC 4651. Distances are estimated as 3.01 \pm 0.87, 3.88 \pm0.42 and 1.00 \pm 0.08 kpc for the clusters NGC 6067, NGC 2506 and IC 4651respectively using parallaxes taken from Gaia DR2 catalogue. Galactic orbitsare determined for these clusters using Galactic potential models.We find thatthese clusters have circular orbits. Cluster radii are determined as 10 arcminfor NGC 6067, 12 arcmin for NGC 2506 and 11 arcmin for IC 4651. Ages of theclusters estimated by isochrones fitting are 66 \pm 8 Myr, 2.09 \pm 0.14 Gyrand 1.59 \pm 0.14 Gyr for NGC 6067, NGC 2506 and IC 4651 respectively. Massfunction slope for the entire region of cluster NGC 2506 is found to becomparable with the Salpeter value in the mass range 0.77 - 1.54 Solar mass.The mass function analysis shows that the slope becomes flat when one goes fromhalo to core region in all the three clusters. A comparison of dynamical agewith cluster's age indicates that NGC 2506 and IC 4651 are dynamically relaxedclusters.

Astrometric and photometric study of NGC 6067, NGC 2506 and IC 4651 open clusters based on wide-field ground and Gaia DR2 data