COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      Number 1141

                              Konkoly Observatory
                              Budapest
                              1976 June 14



          PHOTOELECTRIC MAXIMA OF VZ CANCRI


   Between December 1973 and April 1976, 1800 photoelectric 
observations of the short-period variable VZ Cancri were carried
out at the Astronomical Observatory of the University of Cluj-
Napoca.
   The observations were made in V light with a 50 cm Newton
reflector, a photometer employing an unrefrigerated 1P21 
photomultiplier tube and a Corning 3384 filter.
   The comparison star was HD 73938 (BD+11d1894).
   From the observed light-curves, by Pogson's method, 17 heliocentric 
maxima and the corresponding magnitudes V_max. were determined. 
Table 1 contains the observed times of maxima, where the
differences O-C's and the phase psi_b (for the beat period) refer to
the following elements
      Max.hel.= JD 2433631.8655+ 0.17836367d E
for the principal period, and
      Max.hel.= JD 2433631.8605+ 0.716292d E_b
for the beat period, respectively.
   In order to have a general picture of period variation we
have constructed the diagram O-C=f(psi_b) for heliocentric maxima.
With this end in view we have used the corresponding observations
made by Fitch (Ap.J. 121, 690, 1955), Spinrad (Ap.J. 131, 134, 1960),
Oosterhoff (BAN 18, 459, 1966), and the determined maxima published
by Guman (Mitt.d.Sternw.Budapest-Szabadsaghegy, no. 36, 1955), and
Popovici (IBVS 508, 1971). The results are presented in Figure 1.
The diagram V_max=f(psi_b) is plotted in Figure 2, but here we have
used only Fitch's, Spinrad's, Oosterhoff's and Todoran's observations.



                            IOAN TODORAN
                      Astronomical Observatory
                        Cluj-Napoca, Rumania


                       Table    1
                     Observed maxima

Max. hel.
2442000+    V_max.   E        O-C       E_b      psi_b

128.3910    7.37m  47636    -0.0063d   11861    0.8252d
132.3295    7.37   47658    + .0082    11867     .3236
161.3885    7.43   47821    - .0061    11867     .8929
453.5485    7.35   49459    - .0058    12315     .7706
474.4160    7.44   49576    - .0068    12344     .9034
476.3790    7.20   49587    - .0058    12347     .6439
485.4855    7.38   49638    + .0041    12360     .3573
487.4465    7.50   49649    + .0031    12363     .0949
508.3195    7.49   49766    + .0076    12392     .2352
531.3285    7.33   49895    + .0077    12424     .3577
756.4113    7.17   51157    - .0045    12738     .5910
771.3955    7.24   51241    - .0028    12759     .5101
785.4980    7.41   51320    + .0090    12779     .1982
837.3865     -     51611    - .0064    12851     .6387
867.3600    7.22   51779    + .0020    12893     .4840
871.2775    7.38   51801    - .0045    12898     .9532
873.4160    7.36   51813    - .0063    12901    0.9387


                    [FIGURE 1]
                    [FIGURE 2]