COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      Number 1047

                                Konkoly Observatory
                                Budapest
                                1975 September 26



         PHOTOELECTRIC MAXIMA OF RZ CEPHEI




   This report continues the one in IBVS 915 and contains 3
maxima observed in V light in Cluj-Napoca (1974) and 6 maxima 
observed in V and B light in Trieste (1975).
   Having in view the varying shape of the light-curve around
the maximum of RZ Cep, Pogson's method and "mean" light-curve
were used in order to determine the heliocentric times of maxima.
The number of the used observations is given under "n".
   The O-C differences were computed by using the linear 
elements:

         Max. hel. = JD 2419313.240 + 0.3086731d  E

   In order to have a general picture of the period variation
we have constructed the diagram O-C = f(E) for normal maxima. In
the case of RZ Cephei the problem of the period variation is very
complex and yearly some observed maxima are needed.
   From the diagram (Fig. 1) it seems that, at present day, a
variation may occur in length of the period.

----------------------------------
Max.hel.    n    O-C          E
2442000
----------------------------------
255.409    26  +0.041d       74325
309.422    28    .036        74500
340.290    44    .037        74600
631.363    10    .031        75543
634.456    37    .037        75553
635.375    12    .030        75556
639.388    26    .031        75569
645.563    10    .032        75589
646.491    34  +0.034        75592
----------------------------------


          B. CESTER                   I. TODORAN
    Astronomical Observatory     Astronomical Observatory
        Trieste, Italy               Cluj-Napoca, Rumania


                     [FIGURE 1]