THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 91:583-612, 1994 April

   THE INITIAL MASS FUNCTION FOR MASSIVE STARS IN THE MAGELLANIC CLOUDS. I.
      UBV PHOTOMETRY AND COLOR-MAGNITUDE DIAGRAMS FOR 14 OB ASSOCIATIONS

                                ROBERT J. HILL
     Department of Astronomy, University of Toronto, 60 St. George Street,
              Toronto, Ontario, Canada M5S 1A1; I: hill@ociw.edu

                                BARRY F. MADORE
  NASA/IPAC Extragalactic Database, Infrared Processing and Analysis Center,
   California Institute of Technology, Jet Propulsion Laboratory, MS 100-22,
                 Pasadena, CA 91125; I: barry@ipac.caltech.edu

                                      AND

                               WENDY L. FREEDMAN
            The Observatories, Carnegie Institution of Washington,
        813 Santa Barbara Street, Pasadena, CA 91101; I: wendy@ociw.edu
 
                                   ABSTRACT

        UBV CCD photometry has been obtained for 14 OB associations in the
     Magellanic Clouds using the University of Toronto's 0.6 m telescope
     and the Carnegie Institution of Washington's 1.0 m reflector, both on
     Las Campanas, Chile.  The data are presented and used to construct
     color-magnitude diagrams for the purposes of investigating the
     massive-star content of the associations.

     Subject headings:  Hertzsprung-Russell (H-R) diagram -- Magellanic
                        Clouds -- open clusters and associations: general
                        -- stars: early-type -- stars: luminosity function,
                        mass function