COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1392

                                   Konkoly Observatory
                                   Budapest
                                   1978 March 6



   ON THE LIGHT VARIABILITY OF THE MAGNETIC STAR HD 192678



   The star HD 192678 was investigated by Babcock (1958) and
according to him it shows a strong magnetic field of positive
polarity.                 
   Stepien (1968) made photoelectric observations of this star
in U, B, V system and found light variability with a period of
18d and amplitudes in V, B-V and U-B of 0.015, 0.010 and 0.015
mag., respectively.
   Wolff and Morrison (1973) made photoelectric observations
of HD 192678 in the u,v,b,y-system and found no light variability 
in the years 1963, 1970 and 1971.
   In order to re-examine the case of HD 192678 we decided to
include this star in the observational programme of magnetic
stars. During the summer of 1976 we obtained 12 photoelectric
"B" observations with the 35 cm Cassegrain telescope of the 
Academy of Sciences of GDR, situated in the Schemacha Astrophysical
Observatory, USSR. Reduction of observations was made by standard 
procedure. The results are listed in Table 1. The two comparison 
stars used are: C_1= HD 192200, and C_2= 192849.
Figure 1 displays the C_1 - Var, plotted against C_2 - Var, and
C_1 - Var versus C_1 - C_2. The maximum difference in "B" is only
about 0.010 mag. (according to Stepien,(1968), the amplitude in
"B" should be 0.025 mag.) and the error is about the same. Therefore 
we find no real light variation in HD 192678.
   I would like to thank Dr.W. Schoneich (Central Astrophysical 
Institut of Acad. of Sciences of GDR) for giving me the 
possibility of obtaining these observations.

                      Table 1

   JD          C_1-Var    C_2-Var    C_1-C_2
 2442000+      (mag.)     (mag.)     (mag.)

955.4719       1.523      1.083      0.440
956.4979       1.521      1.082      0.439
959.4619       1.523      1.088      0.434
960.4352       1.526      1.090      0.436
965.5036       1.520      1.082      0.437
970.4244       1.526      1.083      0.443
974.4411       1.532      1.093      0.438
981.4454       1.525      1.081      0.444
983.4688       1.520      1.089      0.430
989.4205       1.525      1.085      0.440
991.4347       1.523      1.089      0.434
998.4139       1.525      1.086      0.438


                   [FIGURE 1]



                               K. PANOV
                            Dept. of Astronomy
                        Bulgarian Academy of Sciences
                        7 November Str. No. 1., Sofia
                               Bulgaria


References:
Babcock, H.W., 1958, Astrophys.J.Suppl., 3, 141 [BIBCODE 1958ApJS....3..141B ]
Stepien, K., 1968, Astrophys.J. 154, 945 [BIBCODE 1968ApJ...154..945S ]
Wolff, S.C. and Morrison, N.D., 1973, Pub.A.S.P., 85, 141 [BIBCODE 1973PASP...85..141W ]