Abstract
Abstract Properties of OB stellar associations in the LMC have been determined from digitized UK Schmidt plates. This material provides a homogeneous data set for revealing the intrinsic differences among the various associations at different locations in the parent galaxy. Isodensity contours, from star counts, and spectral classification offer very good criteria for the exact definition of the OB association, considered as the single unit system among the most recent stellar populations of a galaxy. The isodensity contours are derived for different magnitude levels, in order to trace the limits where the image of each association is detectable. It is found that the faint limits of the LMC associations, examined so far, vary by about four magnitudes, partly depending on their spatial distribution. This finding implies differences in the mass function and, possibly, the star formation mechanism in this galaxy.
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