COMMISSIONS 27 AND 42 OF THE IAU
             INFORMATION BULLETIN ON VARIABLE STARS
                         Number 3990

                                               Konkoly Observatory
                                               Budapest
                                               15 February 1994

                                               HU ISSN 0374 - 0676


                BVR OBSERVATIONS OF THE DOUBLE-MODE
                          CEPHEID CO Aur


  Recently one of us (Berdnikov, 1992) has decomposed available photoelectric 
observations of all double-mode Cepheids into two oscillations. It was pointed out as well that
the number of the existing observations is not sufficient for certain investigation of light
curve variations in the majority of these stars. Therefore we continue to carry out the
observations of the all accessible double-mode Cepheids.
  Photoelectric observations of double-mode Cepheid CO Aur were carried out in summer-
autumn 1993. The 60-cm reflector of the Mt. Maidanak observatory of the Tashkent
Astronomical Institute was used and 18 BVR measurements (Table 1) were obtained.

                    Table 1
------------------------------------------------------------------
JD hel        V      B-V    V-R   JD hel        V     B-V    V-R
  2440000+                        2440000+
------------------------------------------------------------------
9225.4822   7.811   .708   .668   9235.4884   7.574   .611   .589
9226.4821   7.477   .584   .562   9236.4894   7.790   .686   .646
9227.4864   7.890   .733   .673   9237.4853   7.703   .673   .625
9228.4872   7.662   .646   .623   9239.4964   7.728   .679   .633
9229.4861   7.701   .650   .619   9240.4977   7.502   .585   .561
9230.4830   7.742   .687   .642   9241.4983   7.870   .738   .676
9231.4843   7.618   .628   .591   9242.4983   7.498   .588   .565
9232.4831   7.767   .698   .646   9243.5007   7.847   .713   .657
9234.4835   7.889   .753   .676   9244.4946   7.659   .854   .617
------------------------------------------------------------------

  The authors wish to express their thanks to Dr. V.S. Shevchenko for allocation of
observing time.


L. BERDNIKOV                             M. IBRAGIMOV
Sternberg Astronomical Institute         Astronomical Institute, Tashkent,
Moscow, Russia                           Republic of Uzbekistan
University of Saratov, Saratov, Russia


  Reference:               
  Berdnikov L.N., 1992, Pis`ma Astron. Zh., 18, 654 [BIBCODE 1992SvAL...18..259B ]