THE ASTRONOMICAL JOURNAL    VOLUME 111, NUMBER 4, PAGE 1596          APRIL 1996

          FORNAX GLOBULAR CLUSTERS 1 AND 5: A CONFIRMED EXTRAGALACTIC
                             SECOND PARAMETER PAIR

    EDGAR O. SMITH, JAMES D. NEILL, KENNETH J. MIGHELL, AND R. MICHAEL RICH

     Department of Astronomy, Columbia University, 538 West 120th Street,
                           New York, New York 10027
 Electronic mail: edgar@figaro.phys.columbia.edu, rmr@cuphyd.phys.columbia.edu,
       mighell@figaro.phys.columbia.edu, neill@figaro.phys.columbia.edu


                                   ABSTRACT

    We report new color-magnitude diagrams for Fornax globular clusters 1
    and 5 where our data reaches V = 24, below the horizontal branch.
    Using the index B-R/(B+V+R), a measure of the horizontal branch color,
    we find cluster 1 has a red (-0.50 +/- 0.10) and cluster 5 an
    intermediate color (-0.09 +/- 0.12) horizontal branch confirming the
    first extragalactic second parameter pair.  The HB types are markedly
    redder than the Galactic globular clusters at [Fe/H] = -2.  In globular
    cluster 1, we find 21 possible variable stars out of 41 horizontal
    branch stars.  Cluster 1 has an anomalously low ratio of horizontal
    branch to red giant stars, which formally gives a helium abundance of
    0.16 < Y < 0.22, depending on the assumptions used.  For both clusters
    1 and 5, and for the red horizontal branch in the field adjacent to
    cluster 5, V_HB = 21.25 +/- 0.05.  We give calibrated surface
    brightness profiles and measure new core and tidal radii for cluster 1
    of 17.6" and 104" and for cluster 5 of <2" and 91", respectively.