LUMINOSITY FUNCTIONS AND COLOR MAGNITUDE DIAGRAMS FOR 3 OB ASSOCIATIONS IN THE LARGE MAGELLANIC CLOUD

Using the point spread function photometry program DAOPHOT, we have us ed UBV CCD photometry to construct color-magnitude diagrams and lumino sity functions for three OB associations in the Large Magellanic Cloud . The region LH 76 appears to be completely coeval; the region LH 13 s hows some evidence for noncoevality which will need to be checked with spectra of the stars in question. The region LH 105, which lies on th e southern edge of 30 Doradus, shows significant contamination by an u nderlying older population, possibly from previous star forming events . The luminosity functions, which serve as the first step toward deter mining the initial mass function in these regions, are calculated.