COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1337

                                   Konkoly Observatory
                                   Budapest
                                   1977 September 9



           NEW PHOTOELECTRIC OBSERVATIONS
       OF THE DELTA SCUTI STAR HD 73576 (KW 207)



     The delta Scuti star HD 73576 (KW 207), belonging to the
Praesepe cluster, was observed during one night only by M. Breger
(Astrophys.J. 162, 597, 1970). The same author (Astrophys. J.
176, 373, 1972) assigns it a tentative period of 0.071d.
     We have performed photoelectric observations of this star
through B filter during four nights at the beginning of 1977,
using the 102-cm reflector of the Merate Observatory. The 
comparison star, whose constancy we have verified, was HD 73619
(KW 229): it does not vary to an extent of greater than 0.003m.
     The resulting light curves (mc-mv) for the first three
nights (J.D. 43168, ...173 and ...174) are shown in Fig. 1, whereas 
Fig. 2 shows the curve relative to the last night (J.D.43203).
     The observed trend of Fig. 1 is not significantly different
from a simple sinusoid. This fact is confirmed by a spectral 
analysis with Vanicek's method (Astrophys.Space Sci. 12, 10, 1971),
which also gives, for the period, the value of 0.0534d.
     It is apparent in the last night the situation is at all
different. The analysis gives a non-monochromatic periodogram,
with the main peak at 0.059d. Another, much less marked peak
corresponds to a period of 0.068d, and there is perhaps another
one at about 0.051d. The 0.0534d component seems to be disappeared.
    Anyway there is no evidence for the Breger's period. It is
our intention to continue with the observations.

                                  M. BOSSI
                                  G. GUERRERO
                                  L. MANTEGAZZA
                              Osservatorio Astronomico
                              Via E. Bianchi 46
                              22035 Merate (Como), Italy


                     [FIGURE 1]
                     [FIGURE 2]