A study of the Czernik 2 and NGC 7654 open clusters using CCD UBV photometric and Gaia EDR3 data

We analysed the open clusters Czernik 2 and NGC 7654 using CCD UBV photometric Gaia Early Data Release 3 (EDR3) astrometric data. Structural parameters of two were derived, including physical sizes being r=5 as 8 min. calculated membership probabilities stars based on their proper motion components released in EDR3. To identify member clusters, we used these taking into account location impact binarity main-sequence stars. higher than $P=0.5$ to 28 for 369 7654. estimated colour-excesses metallicities separately two-colour diagrams derive homogeneously determined parameters. The derived $E(B-V)$ colour excess is 0.46(0.02) mag 0.57(0.04) Metallicities obtained first time both -0.08(0.02) dex -0.05(0.01) Keeping reddening metallicity constant quantities, fitted PARSEC models colour-magnitude diagrams, resulting distance moduli ages clusters. modulus 12.80(0.07) 13.20(0.16) mag, which coincide with 1.2(0.2) Gyr 120(20) Myr, respectively. distances EDR3 trigonometric parallaxes compared literature. found good agreement between this study Present day mass function slopes are comparable value Salpeter (1955), X=-1.37(0.24) X=-1.39(0.19)