UBV(RI)(C) PHOTOMETRY AND SPECTROSCOPY OF THE YOUNG OPEN CLUSTER HAFFNER-19

We present accurate CCD photometry in the UBV(RI)(c) bands of a 2.9 x 2.4 arcmin(2) field centred on the young open cluster Haffner 19. Spec tral types for 4 members are derived from CCD spectroscopy. 64 probabl e cluster members are identified down to V=18.1. The cluster lies at 5 .0 kpc and suffers from a marked differential reddening [Delta E(B-V)= 0.5] with a mean value E(B-V)=0.44. The extinction law conforms well t o the one valid for the diffuse interstellar medium (R(V)=3.1). The ma in sequence is well defined over the 7-mag interval we explored, with spectral types B0 and F8-G0 on the sequence. The fit with theoretical isochrones gives an age of about 6 x 10(6) yr.