COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 435

                                  Konkoly Observatory
                                  Budapest
                                  1970 April 30



          THE MAGNETIC VARIABLE BETA CrB


      Beta CrB was observed photoelectrically in three
colours with the 60 cm reflector of the Bologna Observatory
for 24 nights during the years 1968 and 1969, using Theta
CrB as comparison star. It shows light variations with an
amplitude of 0m022 in yellow Om030 in blue, 0m026 in ultraviolet
 with the same period as found by Preston and Sturch
(1) for the magnetic variation. Differing from what occurs
for most magnetic variables, the light minimum takes place
about Op1 after the negative maximum of the magnetic field.

      The light curves were plotted with the phases calculated 
by the formula

        Min = JD 2440335.0 + 18d487 E

	              [FIGURE 1]


                        C. BARTOLINI
                        P. BATTISTINI
                        R. PECORARI

                    Observatorio Astronomico
                    Universitario di Bologna





1) Preston,G.W., Sturch,C., The magnetic and related stars.
   Cameron R.C., Ed., Baltimore, 1967. p.111.