Photometric study of the open cluster NGC 2232

Abstract

Three color photoelectric photometry is presented for 43 stars in the vicinity of the southern galactic cluster NGC 2232. The stars range in V magnitude from 5.O mag to 11.4 mag. Photoelectric measurements of Hβ line intensity of 22 early-type stars is also presented. An small and uniform (B-V) color excess of 0.01 mag was found for the cluster. Independent analyses of UBV and Hβ data confirm that NGC 2232, with a minimum membership of 19 stars, is located at a distance of 360 pc. A good agreement between the absolute magnitude calibrations and intrinsic color relations derived from both UBV and Hβ photometry is confirmed. A nuclear age of 20 X 10⁶ years was obtained for the cluster.