A STUDY OF THE OPEN CLUSTER NGC-7209 IN THE VILNIUS PHOTOMETRIC SYSTEM

Photoelectric photometry in the Vilnius seven-colour system is present ed for the open cluster NGC 7209. In total 96 probable cluster members have been measured down to V approximate to 14.0. For all stars their spectral types, absolute magnitudes, colour excesses, interstellar re ddening and distances are derived from the Vilnius photometry. The met allicity is estimated to be [Fe/H] = -0.07. In addition, a list of sus pected binaries is provided. The reddening across the cluster shows a slight trend along the north-south direction. The mean reddening equal s E(Y- V)= 0.121 [in the UBV system E(B - V) = 0.171] which correspond s to A(v) = 0.54. The derived median distance for NGC 7209 is 1026 +/- 30 pc (equivalent to the distance modulus V-0-M(v)=10.06 +/- 0.06). T heoretical isochrone fits to the colour-magnitude diagram yield an age estimate of 0.45 Gyr.