Abstract
UBV RI and H photometry has been performed for the open cluster NGC 6531. A total of 56 bright main sequence (MS) members were selected from their positions in photometric diagrams. We also classified 7 pre-main sequence (PMS) stars and 6 PMS candidates with Ha: emission from H photometry. We determined a reddening of = 0.29 0.03 and a distance modulus of Vo - Mv = 10.5 for the cluster. From the comparison of our photometric results to theoretical evolution models, we derived a MS turnoff age of 7.5 Myr and a PMS age spread of 4 Myr. The IMF slope , calculated in the mass range of 0.45 log m 1.35 is a steep value of = -1.8 0.6.
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