THE ASTRONOMICAL JOURNAL    VOLUME 110, NUMBER 2, PAGE 638          AUGUST 1995

          THE LMC CLUSTER NGC 1866. I. A REVISED PHOTOMETRIC SEQUENCE
           AND A RECONNAISSANCE OF THE SURROUNDING FIELD POPULATION

                              ALISTAIR R. WALKER

     Cerro Tololo InterAmerican Observatory, Casilla 603, La Serena, Chile
                       Electronic mail: awalker@noao.edu


                                   ABSTRACT

    A photometric sequence consisting of 53 stars measured in the V, B, and
    I bands has been set up in the vicinity of the rich, young Large
    Magellanic Cloud cluster, NGC 1866.  Many of these stars are relatively
    isolated and are thus suitable for use as local standard stars for
    photometric studies of the cluster.  Color magnitude diagrams to a
    limit of V = 20.5 for various parts of the 13x13 arcmin field, centered
    on the cluster, show that NGC 1866 is embedded in a mix of populations
    which includes stars younger than the cluster itself, the dominant
    0.5-3 Gyr population, plus some very old stars represented by four RR
    Lyrae variables.