COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       Number 2558

                                         Konkoly Observatory
                                         Budapest
                                         23 July 1984

                                         HU ISSN 0374-0676

           ELECTROPHOTOMETRY OF DH Peg AND AV Peg

  Electrophotometry of selected RR Lyrae stars in intermediate band
Stromgren system and H beta is in progress at Abastumani Astrophysical
Observatory, after a new automatic 125 cm reflector was put into operation in
1980. The final aim of the present investigation is to determine the physical
parameters of stellar atmospheres and the metallicity index. The filters used
for presentation of the above system were kindly contributed for temporary use
by Dr. R.M. West. These filters, belonging to the European Southern Observatory,
are used for observing Ap stars in collaboration with Dr. R.M. West. The stars
are being observed with the same telescope according to the programme
coordinated by Dr. R.M. West.
  The photometry of the variables was fulfilled automatically. BD +5d 4982
(for DH Peg) and BD +21d 4636 (for AV Peg) served as the comparison stars.
Table I lists the photometric characteristics determined by the recent 
observations.

                    Table I
Star        V       b-y          m1      c1                n
+ 5d4982    8.41    0.055        0.107   0.835     2.800   12
              03      009          020     013       014
+21d4631    9.48    0.564        0.300   0.430     2.570   13
              02      008          019     031       018

The last column shows the number of determinations. The rms errors of one
determination of each value are given too.
The photometric results of DH Peg and AV Peg are shown in Figures 1 and 2.
The extreme values of the observed parameters are given in Table II.
                    Table II
Parameter           DH Peg                     AV Peg
            Max              Min       Max               Min
V           9.27             9.74     10.02             10.92
b-y         0.164            0.355     0.130             0.346
m1                  <0.094>                    <0.147>
C1          1.276            1.012     1.310             0.696
H beta     2.828            2.682     2.822             2.655



                            [FIGURE 1]
                            [FIGURE 2]


  The complete data on the above-mentioned stars and the discussion will be
published later. We should like to report that data have also been obtained
and processed for the stars RR Lyr, RZ Cep, TT Lyn, SZ Lyn, XZ Dra, BH Peg,
TU UMa.


                 I. Ph. ALANIA
              Abastumani Astrophysical
              Observatory, Academy of
              Sciences of the Georgian SSR