COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                        Number 3080


                                           Konkoly Observatory
                                           Budapest
                                           31 August 1987

                                           HU ISSN 0374-0676


          NEW UBV PHOTOELECTRIC OBSERVATIONS OF GZ And

  The variability of eclipsing binary GZ And was detected by Walker(1973)
who suggested that GZ And was a W UMa type eclipsing binary.
  New UBV photoelectric observations of GZ And were made using P34B photometer 
attached to the 0.91m reflector between Sep. and Nov. 1984 at McDonald
Observatory.
  The observed times of light minima, which are the same for each band and
(O-C) values are listed in Table I.

                 Table I. The times of minima

       Primary                       Secondary
  JD(hel) 2440000+       (O-C)       JD(hel) 2440000+     (O-C)
    5950.93175       -0.04313          5984.93999       -0.04350
    5951.84676       -0.04314          5985.85502       -0.04351
    5985.70251       -0.04350          5986.77004       -0.04352
    5986.66105       -0.04352
    6007.66299       -0.04375          6009.64554       -0.04377
    6008.57802       -0.04376          6013.61063       -0.04381
    6012.54310       -0.04380
    6015.59317       -0.04383

The (O-C) values were calculated using the formula

          Min(I)=JD(hel) 2441976.69458 + 0.30501d E

given by Walker.

  We obtained the new ephemeris of GZ And:

          Min(I)=JD(hel) 2445985.70251 + 0.3050067d E
                                 +/-35        +/-4
  The UBV light curves of GZ And are plotted in Figure 1.
  The average colour indices are (B-V)=0.78m+/-0.02 and (U-B)=0.27m+-/0.02 
as seen in Figure 2.
The depth of both minima is given in Table II. The depth of the primary
minimum and secondary minimum is almost equal.



                             [FIGURE 1]

         Figure 1. The VBU light curves of GZ And


                             [FIGURE 2]

         Figure 2. The colour index (B-V) and (U-B) curves of GZ And


  Table II. The depth of minima of GZ And

  Colour Depth of minima

    V         0.88 +/- 0.02
    B         0.92 +/- 0.02
    U         1.01 +/- 0.03

  The photometric solution of GZ And will be published elsewhere.



                           LIU XUEFU
                            and

                           YANG JING

                  Department of Astronomy, Beijing Normal University

                           TAN HUISONG
                   Yunnan Observatory, Academia Sinica


Reference:
Walker, R.L., 1973, Inf.Bull.Var.Stars, No. 855.