THE ASTRONOMICAL JOURNAL    VOLUME 111, NUMBER 2, PAGE 936        FEBRUARY 1996

         ICCD SPECKLE OBSERVATIONS OF BINARY STARS. XIII. MEASUREMENTS
             DURING 1989-1994 FROM THE CERRO TOLOLO 4 M TELESCOPE

   WILLIAM I. HARTKOPF, BRIAN D. MASON, HAROLD A. McALISTER, NILS H. TURNER,
                              AND DONALD J. BARRY

    Center for High Angular Resolution Astronomy, Georgia State University,
                            Atlanta, Georgia 30303
       Electronic mail: (hartkopf, mason, hal, nils, don)@chara.gsu.edu

                                 OTTO G. FRANZ

                 Lowell Observatory, Flagstaff, Arizona 86001
                        Electronic mail: ogf@lowell.edu

                              CRISTINA M. PRIETO

  Observatorio Astronomico Ramon Maria Aller, Universidade de Santiago, Spain
      and Departament de Matematica Aplicada, Universidade de Vigo, Spain
                        Electronic mail: oacris@usc.es


                                   ABSTRACT

    Nine hundred eighty-nine observations of 694 binary star systems,
    observed by means of speckle interferometry with the 4 m telescope on
    Cerro Tololo, are presented.  Included in these observations are three
    new interferometric binaries and new interferometric companions to four
    visual binaries.  These measurements, made during the period 1989-1994,
    comprise the 13th installment of digital results stemming from our
    speckle program at several major observatories, and the 23rd list since
    the program's inception in 1975.