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M. Pozzo (Astrophysics Group, Dept. of Physics, Imperial College of Science Technology and Medicine, Blackett Lab., UK), R.D. Jeffries (Dept. of Physics, Keele University, UK), T. Naylor (School of Physics, University of Exeter, UK)
We present the results of the UBVI CCD photometric survey of the younger subgroup (Cep OB3b) of the Cep OB3 association. We have discovered a low-mass PMS stellar association mixed with the early-type members of the subgroup. Its location in a V vs (V-I) colour-magnitude diagram is clearly separated from contaminating field stars, and encompasses the X-ray sources recently discovered in the region by Naylor & Fabian (1999). The spectroscopic follow-up of the optically selected PMS sample has confirmed the kinematic membership of several candidates, together with their PMS nature (WTTS and CTTS). The optical sample has then been cross-correlated with NIR sources found in the region by 2MASS (Second Incremental Release Point Source Catalogue), in order to look for objects with genuine IR excess, suggesting the presence of a circumstellar accretion disk.