COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                       Number 2265

                                       Konkoly Observatory
                                       Budapest
                                       1983 January 12

                                       HU ISSN 0374-0676


    PHOTOGRAPHIC OBSERVATIONS OF THE MAGNETIC BINARY SYSTEM PG 1550 +191


  The AM Herculis-type magnetic binary star PG 1550 +191 has been discovered
by S. Liebert et al. (1982, Ap.J. 256, 594) on the Palomar Green Survey (PG)
of blue stellar objects at high galactic latitude.
  The star shows polarization and light variations with a period of of 0.078873d  
(Liebert et al. 1982). Its mean infrared color index is similar to that of
AM Herculis high state.
 The star was observed on seventeen plates obtained at Asiago with the
40/50/100 cm Schmidt during the period August 1972 - May 1981. The time of
exposure was five minutes on the average.
 We have determined the brightness of the variable during the period covered
by the present observations. The derived magnitudes are reported in Table I.

                                 Table I

  JD 244...   mpg    JD.244...    mpg
                              
  1534.3921   15.7   3284.5483   14.7
  1572.3143   15.1   3306.5527   15.5
  2272.3643   14.9   3664.5882   15.1
  2519.5961   15.0   3986.5555   15.4
  2549.5649   14.8   4017.5135   15.6
  2606.4839   15.0   4372.5392   15.2
  2904.6017   15.0   4402.4581   15.6
  3227.6416   15.0   4402.4651   15.1
                     4753.4981   15.0

  Although the observations were not sufficient to improve the period given
by Liebert et al., they showed that the star was always in its high state.
  The variation of brightness from 14.7 to 15.7 was due to eclipses.



                     G. ROMANO
                 Istituto di Astronomia
                 Universita di Padova




Erratum: In IBVS No. 2161 (1982 June 15), the new variable star is not
GR 306 but GR 310.