Astronomers inspect two galacticopenclusters arxiv
We performed detailed photometric and astrometric analyses of the open star clusters Berkeley 68 and Stock 20. This was based on ground-based CCD UBV photometric data complemented by space-based Gaia Data Release 3 photometry and astrometry. 198 stars were identified as likely cluster members for Berkeley 68 and 51 for Stock 20. Two-color diagrams were used to derive the reddening and photometric metallicity for each cluster. The reddening for Berkeley 68 is $E=0.520 \pm 0.032$ and $0.400 \pm 0.
Photometric distances are $d=3003 \pm 165$ pc for Berkeley 69 and $2911 \pm 216$ pc for Stock 20. The cluster ages are $2.4 \pm 0.2$ Gyr and $50 \pm 10$ Myr for Berkeley 68 and Stock 20, respectively. Present-day mass function slopes were found to be $\Gamma=1.38 \pm 0.71$ and $\Gamma=1.53 \pm 0.39$ for Berkeley 68 and Stock 20, respectively. These values are compatible with the value of Salpeter . The relaxation times were estimated as 32.55 Myr and 23.
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