THE ASTRONOMICAL JOURNAL    VOLUME 108, NUMBER 3, PAGE 932       SEPTEMBER 1994

             VARIABLE STARS IN AND AROUND THE SMC CLUSTER NGC 330

                           K. M. SEBO AND P. R. WOOD

          Mount Stromlo and Siding Spring Observatories, Private Bag,
                    Weston Creek PO, A.C.T. 2611 Australia
           Electronic mail: kim@mso.anu.edu.au, wood@mso.anu.edu.au


                                   ABSTRACT
    
    V and I band CCD images of the SMC cluster NGC 330 have been obtained
    over an interval of 4 years with the aim of identifying variable stars
    in and around this rich, young cluster.  The search has revealed 22
    Cepheid variables, of which 14 are newly discovered.  All of these
    appear to belong to the SMC field population rather than being cluster
    members.  Twenty long-period variables, and nine other variables were
    identified including two eclipsing variables (one newly discovered),
    and four close binary stars, two of which show emission lines.  The
    Cepheids indicate that only small to moderate amounts of convective
    core overshoot (f_ov <~ 0.25) occur during the main-sequence phases for
    stars of mass 2-3 Msun.  The Cepheid period-luminosity-color relation
    obtained from VI photometry, when compared to the theoretical relation
    of Chiosi, et al. [ApJS, 86, 541 (1993)], yields a distance modulus for
    the short-period Cepheids observed during this study of 18.92 if no
    overshoot is assumed, or 18.72 if moderate overshoot (f_ov = 0.25) is
    adopted.  Only two modes of pulsation are present in this group of
    Cepheids, most likely they are the fundamental and first overtone.