COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 2451

                                      Konkoly Observatory
                                      Budapest
                                      23 December 1983

                                      HU ISSN 0374-0676





     PHOTOELECTRIC TIMES OF MINIMA OF ECLIPSING VARIABLES


   During a program of photoelectric observations of eclipsing
variables at Kryonerion Observatory, Greece, the close eclipsing
systems V566 Oph (BD+5d3547 ) and V388 Cyg (BD+30d4051) were
observed photoelectrically in July 1981 and September 1982,
respectively. The observations were made with a 48-inch Cassegrain 
reflector and a two beam multi-mode photometer (Goudis
and Meaburn, 1973). The two intermediate pass-band filters used
were selected to be in close accordance with the standard UBV
colour system.

   The times of minima, given in the following Table I, were
determined by the method of bisecting chords which connect the
points of equal magnitudes on the opposing branches near the
minimum.





                    Table I


        HJD

   Star   2440000+              E              O-C    Filter    Rem.

V566 Oph         4795.3461    10684.5        +0.0085     B,V    MinII
V566 Oph         4796.3698    10687          +0.0081     B,V    MinI
V566 Oph         4797.3946    10689.5        +0.0088     B,V    MinII
V566 Oph         4798.4191    10692          +0.0091     B,V    MinI
V566 Oph         4799.4434    10694.5        +0.0093     B,V    MinII
V388 Cyg         5228.4142    13554.5        -0.1413     B,V    MinII
V388 Cyg         5231.4186    13558          -0.1436     B,V    MinI
V388 Cyg         5232.2786    13559          -0.1427     B,V    MinI



   The successive columns contain the name of the star, the
heliocentric time of minimum, the number of cycles E, the 
difference O-C, the filter used and remarks. The O-C values for
V566 Oph were computed  according to the ephemeris given by
Dawson and Narayanaswamy  (1977):

         MinI = JD Hel 2440418.4931 + 0.40964431d x E


while the O-C values for V388 Cyg were calculated according
to the ephemeris (Cerruti-Sola, M. et al., 1977).

         MinI =JD Hel 2433584.542 + 0.8590515d x E





             P.G. NIARCHOS
             Department of Astronomy
             University of Athens
             Panepistimiopolis, Athens 621
             Greece





References:

Cerruti-Sola, M., Lorenzi, L. and Scaltriti, F.: 1977, Astron.
            Astrophys.Suppl. 27, 435. [BIBCODE 1977A&AS...27..435C ]
Dawson, D.W. and Narayanaswamy, J.: 1977, P.A.S.P. 89, 47. [BIBCODE 1977PASP...89...47D ]
Goudis, C. and Meaburn, J.: 1973, Astrophys. Space Sci., 20, 149. [BIBCODE 1973Ap&SS..20..149G ]