COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1808

                                  Konkoly Observatory
                                  Budapest
                                  1980 June 23




          OBSERVATIONS OF CI Cyg IN 1979





    Photometric observations of the symbiotic eclipsing-binary
star CI Cyg have been continued in 1979 from March 31 to December 
24 (Belyakina, 1979 a, b).
    The results of these observations in instrumental system
as regards the comparison star BD+35deg3821 (V=10.49m, B-V=+0.31m,
U-B=+0.13m) are plotted in Fig.1. From 1978 November 22 to 1979
March 31 the brightness of CI Cyg in v,b,u-bands decreased by
0m3, 0m4, and 0m6, respectively, as can be seen by the comparison 
of the observations of CI Cyg in 1978 (Belyakina, 1979 b)
and in 1979.
    During 1979 the registered radiation of the variable has
changed smoothly with maximum amplitude in v-band (Delta v=0.35m,
Delta b=0.25m, Delta u=0.20m). It is interesting to note that only the
yellow and blue light-curves are synchronous.

                    [FIGURE 1]

                         T.S. BELYAKINA
                     Crimean Astrophysical Observatory
                       334413 Nauchny,Crimea,USSR
References :
Belyakina, T.S. 1979.Izv. Krimsk.Astrophys.Obs. 59, 133
Belyakina, T.S. 1979, I.B.V.S. No. 1602