A Spectroscopic and Photometric Investigation of the Association Cepheus OB2

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Abstract
Distance moduli based on MK spectral classification and UB V photometry were obtained for seventy- five intrinsically bright stars in the region of Cepheus 0B2. A concentration of early-type main-sequence and supergiant stars with a mean distance modulus of 9 5 mag is found between l~ = 96° and 107°, bhl = +2° and +8°. The concentration includes the clusters NGC 7160 and Trumpler 37 A connection is seen with Cepheus 0B3, and a concentration of about 1.5 X 1O~ ~J1o of neutral hydrogen at the same radial velocity as the stars surrounds both associations. Little evidence was found to support a value of total absorption in V to selective absorption in B - V different from 3.0

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