COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      Number 1122

                                  Konkoly Observatory
                                  Budapest
                                  1976 April 5


         CHANGES IN THE PERIOD OF XZ ANDROMEDAE




   One of the hypotheses explains changes in the period of XZ And
by the motion of apsidal line (cf. Todoran, 1967). Unfortunately,
there are some difficulties in the determination of accurate times
of secondary minima which are very shallow. Only photoelectrical
observations are useful for this purpose.
   Table 1 contains the times of secondary minima obtained from
photoelectrical observations published by Blitzstein (1954) and
Reinhardt (1967). The last minimum was observed by the writer with
the 50 cm Cassegrain-telescope of the Astronomical Observatory in
Cracow. The values of O-C and E was computed from the linear 
elements:
   Primary minimum   = 242 3977.1915
                                      + 1.357278d E
   Secondary minimum = 242 3977.8701

                  Table 1
              Secondary minima of XZ And

      J.D. hel.         E          O-C       Observer

    243 3231.7415   + 6818      -0.0500     Blitzstein
    243 9020.5507   +11083      -0.0315     Reinhardt
    244 2742.2476   +13825      +0.0092     Kreiner

   The O-C diagram of XZ And is given in Fig. 1. The diagram is
constructed on the basis of Todoran's paper (1967) and completed

                       [FIGURE 1]

with visual observations up to January 1976. The crosses on the
O-C curve represent the secondary minima.
   The position of secondary minima on the O-C diagram excludes
the explanation of the observed changes in the period by apsidal
motion.




                          J. M. KREINER
                        Astronomical Observatory
                     of the Jagiellonian University,
                          Cracow, Poland.




References:
Blitzstein, W., 1954, A.J. 59, 251 [BIBCODE 1954AJ.....59..251B ]
Reinhardt, M., 1967, A.N. 290, 19 [BIBCODE 1967AN....290...19R ]
Todoran, I., 1967, B.A.C. 18, 328 [BIBCODE 1967BAICz..18..328T ]