COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1183

                               Konkoly Observatory
                               Budapest
                               1976 October 4



  NEW PHOTOELECTRIC OBSERVATIONS OF THE DELTA SCUTI STAR HR 4684





   HR 4684 belongs to the Coma Cluster and this was the first
Delta Scuti star to be discovered in a galactic cluster (Breger
and Sanwal, Astrophys.Lett. 1, 103, 1968). J.E. Elliot (Astron.J.
79,1082,1974) measured the star for few nights during 1970 and
he determined the period P=0.0551d.
  We observed HR 4684 at the Merate Observatory through V filter 
during two series of consecutive nights: JD 2442862. - 866.
and JD 2442912. - 916. The light curves related to the last 
series are plotted in Figs. 1-5.
  The shape and the amplitude of the light curves are different 
from cycle to cycle. We tried to represent our maxima and
minima using the period suggested by Elliot, but with no success.
On the contrary it is possible to reproduce the minima of the
nights JD 42915.- 916. using P=0.0713d, but this period is not
useful for the previous nights.
   We believe that a periodogram analysis is necessary and we
have intention of doing it in the immediate future.


                             G. GUERRERO
                             L. MANTEGAZZA

                          Osservatorio Astronomico
                            Via E. Bianchi 46
                          22035 Merate (Como), Italy


                   [FIGURE 1]
                   [FIGURE 2]
                   [FIGURE 3]
                   [FIGURE 4]
                   [FIGURE 5]