COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                         Number 3484

                                            Konkoly Observatory
                                            Budapest
                                            20 June 1990

                                            HU ISSN 0374 - 0676


      PHOTOELECTRIC OBSERVATIONS OF VZ CANCRI 1988 - 1990
                   (BAV-Mitteilungen No. 58)

   From spring 1988 to spring 1990 BAV members photoelectrically observed
16 maxima of this delta Scuti-star. Their heliocentric times are listed in
Table I, column 1.
   Column 2 and column 3 of this table contain epoch and O-C calculated
with the linear elements of Todoran (1976).

         Max hel = JD 2433631.8655 + 0.178 36367d*E,

Column 4 contains the phase psi b of the maxima calculated with Todoran's
(1976) elements for the beat period P_b
                     
         Max hel(P_b) = JD 2433631.8605 + 0.716 292d * E_b,
                             
Column 5 names the observers and column 6 is a literature source in case
times of maxima have been previously published. Observers and their instru-
ments are
QU     = W. Quester, 200 mm Newton, 931B multiplier with GG495(1 mm) for V
RI, SH = P. Ringe and O. Schall, 150 mm refr., EMI 9781B multiplier without
          filter
SG     = P. Sterzinger, 200 mm Schmidt-Cassegr. with SSP-3, V filter
WU     = E. Wunder, 345 mm Cassegrain, 1P21, V filter.
Ringe and Schall observed at the Dortmund Public Observatory, Wunder at the
Nuremberg Observatory, and the two others with their private equipment.
   The O-C values show that Todoran's elements still represent maximum
times very well. To check the beat period, O-C's were plotted into Todoran's,
original. Figure 1. This figure is duplicated here with crosses denoting the
O-C from Table I. They deviate from the main track of older observations
much more than those by Cester et al. (1977) who remarked that "the O-C's
fall on the upper border of the strip shown in his [Todoran's] Fig. 1".
Cester's O-C's are included here as open circles.
   A period search with maximum times later than JD 2440620 published by
Popovici (1971), Hahn et al. (1975), Todoran (1976), Cester et al. (1977)
and the observations from Table 1 resulted in a range in days for the beat
period: 0.716 280 <= P_b <= 0.716288.

                      Table I
Max. hel.
JD 2400000+     E       O-C     psi b     Obs. Source
47205.5221    76101    0.0029   0.900     QU   BAV-Mitt 50(1988)
47213.3708    76145    0.0036   0.857     QU   BAV-Mitt 50/1988)
47240.2974    76296   -0.0027   0.449     SG   BAV-Mitt 50(1988)
47530.4926    77923   -0.0052   0.584     QU   BAV-Mitt 52(1989)
47555.4657    78063   -0.0030   0.449     QU   BAV-Mitt 52(1989)
47565.4570    78119   -0.0000   0.397     QU   BAV-Mitt 52(1989)
47566.5302    78125    0.0030   0.895  RI, SH  BAV-Mitt 52(1989)
47591.3154    78264   -0.0044   0.498     QU   BAV-Mitt 52(1989)
47591.4907    78265   -0.0074   0.742     QU   BAV-Mitt 52(1989)
47612.3673    78382    0.0006   0.888     QU   BAV-Mitt 52(1989)
47928.4400    80154    0.0129   0.150     QU   this note
47943.4192    80238    0.0095   0.062     QU   this note
47945.3705    80249   -0.0012   0.786     WU   this note
47968.3838    80378    0.0032   0.915     QU   this note
47974.4461    80412    0.0012   0.378     QU   this note
47975.3291    80417   -0.0077   0.611     QU   this note


                               [FIGURE 1]



  WOLFGANG QUESTER
  Berliner Arbeitsgemeinschaft
  fur Veranderliche Sterne e.V. (BAV)
  Munsterdamm 90, D-1000 Berlin 41


References:
Cester, B., Giuricin, G., Mardirossian, F., Mezzetti, M. and Pucillo, M.:
       1977, IBVS No. 1338.
Hahn, G., Lustig, G., Jasicek, H. and Klement, G.: 1975, IBVS No. 1078.
Popovici, C.: 1971, IBVS No. 508.
Todoran, I.: 1976, IBVS No. 1141.