We present BVR _ { c } I _ { c } CCD photometry in the fields of six Galactic open clusters toward the Perseus spiral arm .
These data , complemented with J , H , and K _ { S } magnitudes from 2MASS , have been used to determine the ages , distances , and colour excesses E ( B - V ) for these clusters : 40 Myr , 3180 ^ { +440 } _ { -380 } pc , 0.54 \pm 0.03 mag ( Berkeley 96 ) ; 250 Myr , 2410 ^ { +220 } _ { -200 } pc , 0.77 \pm 0.06 mag ( Berkeley 97 ) ; 70 Myr , 2490 ^ { +180 } _ { -170 } pc , 0.51 \pm 0.05 mag ( King 12 ) ; 160 Myr , 2830 ^ { +160 } _ { -150 } pc , 0.88 \pm 0.09 mag ( NGC 7261 ) ; 280 Myr , 2450 ^ { +190 } _ { -170 } pc , 0.24 \pm 0.03 mag ( NGC 7296 ) ; and 160 Myr , 2750 ^ { +220 } _ { -210 } pc , 0.49 \pm 0.02 mag ( NGC 7788 ) .
We found gaps in the mass function of clusters Be 97 , King 12 , and NGC 7788 in the mass intervals of [ 1.3–1.5 ] , [ 1.4–1.6 ] , and [ 1.5–1.7 ] solar masses , respectively .