Abstract:
We present U BV RI CCD photometry for
previously unstudied open clusters (Be 64 and Be 69).
Photometry has also been carried out for nearby fields to
correct for the effects of field stars contamination. From
the colour-colour diagram the reddening for Be 64 and
Be 69 is estimated to be ∼ 1.05 mag and ∼ 0.65 mag
respectively. In case of Be 69 the comparison of obser-
vational colour - magnitude diagram (CMD) with the
standard isochrones of VandenBerg (1985) indicates an
apparent discrepancy between the shape of the turnoff
and isochrones. The morphological features of the CMDs
of Be 69 are better understood in terms of convective
overshooting. The comparison of CMDs of both the clus-
ters with the convective overshoot models (Bertelli et al.
1994) produces a good fit for a metallicity Z = 0.008
and age = 0.8 − 1.0 Gyr. An apparent distance modulus
(m − M ) = 16.2 and 14.3 has been estimated for Be 64
and Be 69, respectively, which corresponds to a distance
of 3880 ± 480 pc and 2860 ± 310 pc, respectively.
