COMMISSION 27 OF THE I.A.U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 1295

                                                    Konkoly Observatory
                                                    Budapest
                                                    1977 June 20


        HR 4668: A NEW BRIGHT VARIABLE STAR

Between April 18 and April 27, 1977 photometric measurements 
of the Delta Scuti star HR 4684 were made with the
60 cm telescope at Haute Provence Observatory.
   As comparison stars HR 4668 and HR 4694 were used. These
stars were used earlier by Elliott (1974) as comparison
stars for HR 4684.
   Due to the relatively poor weather conditions, good measurements 
could be obtained only on April 19, 23, 24 and 25.
In order to eliminate the influence of variable extinction,
we increased the observing speed by using the Johnson B
filter only.
   Figure 1 shows the magnitude differences HR 4668-HR 4694
during the four observing nights of acceptable quality.
The error bars indicate the dispersion of the magnitude
differences between the other comparison star HR 4694 and
the small-amplitude variable HR 4684. In this way the mean
error indicated is an overestimation of the real mean error.
The diagrams show that HR 4668 is variable on a time scale
of several hours. The nightly mean values in table 1 however 
do not reveal night-to-night variability.

         JD 244     n   Delta m

         3253.5     7   -0.395
         3257.5     5   -0.388
         3258.5     5   -0.377
         3259.5    23   -0.388

Table 1. The nightly mean values of the magnitude differences
         HR 4668-HR 4694. n denotes the number of
         measurements.


Acknowledgements

The authors are indebted to the "Centre National de Recherche
Scientifique" and to the staff of Observatoire de Haute Provence 
for the permission to use the 60 cm telescope and
photometric equipment.


                               GH. DERIDDER
                               C. STERKEN
                               D. VANBEVEREN

                               Astrophysical Institute
                               Vrije Universiteit Brussel
                               Pleinlaan 2
                               B-1050 Brussels, Belgium



Reference:

Elliott, J.E.: Astronomical Journal 79, 1082, 1974. [BIBCODE 1974AJ.....79.1082E ]


                       [FIGURE 1]

  Fig. 1. Differential B measurements of HR 4668 during the four
  observing nights.