COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1078

                                Konkoly Observatory
                                Budapest
                                1975 December 28



     PHOTOELECTRIC OBSERVATIONS OF VZ Cnc (HD 73857)



  The observations were made during four nights in 1967/68 by
Klement and Sterzinger with the 24" refractor of the University
Observatory in Vienna. Measurements in the blue and yellow 
spectral region were obtained around maximum light. In 1974, UBV-
observations over two cycles were obtained during two nights by Hahn
and Lustig with the 60 cm photometric reflector of the Observatoire 
de Haute Provence (OHP). From the light-curves we determined 
the maxima and the moment of occurrence of the median magnitude 
on the ascending branch T (m),m = 0.5 (m_max + m_min). The 
reduction of the data brought no changes of either the primary or
the beat period. It would be necessary to get long runs over two
or three primary cycles to be able to detect a possible variation
of the beat period (P_p= 0.17836376d, P_b= 0.716292d, ref. W.S. Fitch,
Ap.J. 121, 690, 1955).
The observational data are summarized in the following table.


--------------------------------------------------------------
Date of            T_max           T(m) Amplitude   Observers
Observations       JD hel          JD hel
--------------------------------------------------------------
1967.12.28/29  243 9852.6396d  243 9852.6347d 0.67m Klement,
                                                    Sterzinger
1968.01.22/23      9878.5006       9878.4962  0.55  Klement,
                                                    Sterzinger
1968.01.23/29      9879.3958       9879.3896 0.43   Klement, 
                                                    Sterzinger
1968.02.16/17      9903.4730                        Klement,
                                                    Sterzinger
1974.02.20/21  244 2099.5045   244 2099.4851 0.67   Hahn,Lustig
1979.02.21/22      2100.3915                 0.49   Hahn,Lustig
--------------------------------------------------------------



GERHARD HAHN             HANS JASICEK
GUNTER LUSTIG            GERHARD KLEMENT
University Observatory   University Observatory
A-8010 Graz, Austria     (Amateur-Group)
                         A-1180 Vienna, Austria