COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                      Number 904

                                     Konkoly Observatory
                                     Budapest
                                     1974 June 30


       PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES

     In the Table we give twelve photoelectric minima of three
eclipsing binaries. The observations in V light were performed
photoelectrically at the 40 cm refractor of the Teramo Observatory. 
We have computed the times of minimum light by the Kwee-
vanWoerden method. (O-C)'s were computed with the elements from
the "Rocznic Astronomiczny 1974" for RT And and AC Boo while for
RT Per we used the elements of Frieboes-Conde and Herczeg (1973).

     J.D.       E          O-C      sigma    Observer

RT And

2441598.4912   2371      -0.0087  +-0.0010   Mancuso
  41627.4227   2417      -0.0081    0.0012   Di Paolantonio

AC Boo

2441457.4215   10494.5   +0.0012  +-0.0007   Milano
  41458.4785   10497.5    0.0008    0.0014   Milano
  41503.4147   10625      0.0024    0.0005   Mancuso
  41506.4096   10633.5    0.0017    0.0006   Mancuso
  41513.4567   10653.5    0.0002    0.0017   Mancuso
  41515.3975   10659     +0.0027    0.0018   Mancuso

RT Per

2441298.4128   25604     -0.0294  +-0.0009   Milano
  41300.5397   25605.5    0.0260    0.0007   Milano
  41304.3595   25611      0.0286    0.0016   Milano
  41627.5588   25991.5   -0.0283    0.0010   Di Paolantonio



                             S. MANCUSO  and  L. MILANO
                               Capodimonte Observatory
                                        Naples


Reference:
Frieboes-Conde H., Herczeg T. 1973, Astron. and Astroph. Suppl. 12. 19. [BIBCODE 1973A&AS...12....1F ]