COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1350

                                  Konkoly Observatory
                                  Budapest
                                  1977 October 17



          MINIMA OF ECLIPSING BINARY STARS



   Presented are 28 minima of eclipsing binary stars. All 
observations were visual with both the descending and ascending
branch of the light curve observed. Times of minima were found
by the tracing paper method.
   Column one gives the heliocentric time of minima. Column
two gives the number of visual brightness estimates used in the
light curve. Columns three and four give the epoch and O-C from
the linear elements of GCVS 1969. Column five gives the standard
deviation, sigma, expected for a single visual minimum of that star
is given. These standard deviations are calculated from studies
by Mallama, A.D. (1974a, JAAVSO, 3, 11 and 1974b, JAAVSO, 3, 49).
Column six indicates the observer.
Telescopes used were as following: 20.3 cm refractor, 36.2cm
reflector, and a 15.2 cm reflector.

JD hel.           n   Epoch     O-C days   sigma  Observer
2,440,000+
OO Aquilae
2906.737          8   17722     -.035d      .006d  Stephan
2957.680         11   17822.5   -.025              Stephan

WW Aurigae
2786.800         10   3897.5    -.001       .01    Stephan

R Canis Majoris
2887.502          8   6490      -.010       .01    Stephan

RZ Cassiopeiae
2412.644         16   4408      +.005      .004    Stephan
2510.652         14   4490      +.003              Stephan
2712.649         10   4659      +.003              Stephan
2786.750         14   4721      -.001              Stephan
2878.781         14   4798      -.004              Stephan
3073.609         10   4961      -.001              Stephan
3080.775          9   4967      -.007              Stephan

EK Cephei
2447.546         14   778       +.003       .006   Stephan

                       Table (cont.)
JD hel.        n       Epoch     O-C days   sigma  Observer
2,440,000+
U Coronae Borealis
2984.695       8       7600     -.021d       .007d  Stephan

W Corvi
2510.634       8       37748    -.008        .01    Stephan

Y Cygni
2574.719      10       11027     -.168       .01    Stephan
2712.570      12   *   11073     -.146              Stephan

RZ Draconis
2984.641      11       24571.5   -.012       .005   Stephan

AI Draconis
2574.725      13       2934      -.006       .005   Stephan

YY Eridani
2760.708      12       28439.5   -.004       .005   Stephan

SZ Herculis
2878.748      12       9646      +.030      .003    Stephan

FL Lyrae
2906.758       9       2151      -.004       .01    Stephan

U Ophiuchi
2574.651      10       20446     -.006       .01    Stephan

ER Orionis
2446.541       8       14024     -.019       .007   Stephan
2760.703      11       14766     -.020              Stephan

HU Tauri
3080.750       8       8481      +.010      .01     Stephan

X Trianguli
3050.668      11       5639      -.035       .003   Stephan
3053.585       9       5642      -.033              Stephan

AZ Virginis            
2503.746      13       47733     -.024       .005   Stephan

JD hel. equals the heliocentric Julian Day for minima.
n equals the number of visual brightness estimates used to plot
the light curve.
Epoch and O-C are from the linear elements in the 1969 General
Catalogue of Variable Stars.




                               CHRISTOPHER P. STEPHAN
                               Mahoning Valley Observatory
                               Braceville, Ohio, U.S.A.