COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1908

                                  Konkoly Observatory
                                  Budapest
                                  1981 January 8

                                  HU ISSN 0374-0676


       TIMES OF MINIMA FOR SEVEN ECLIPSING BINARIES



    Sixteen minima for seven eclipsing variables have been 
determined photoelectrically between September 1979 and September
1980. The telescope used was the 30 cm Maksutov of the University 
of Ankara, which is equipped with an uncooled EMI 6256 S
photomultiplier and dc chart recorder.
    The times of minima are given in Table I, where the first

                             Table I

Binary   Min.   HJD 2444000       Binary    Min.   HJD 2444000
RX Ari    I      227.3100+-0.0017   U Oph     II     432.3183+-0.0011
                    .3112+-0.0020                       .3168+-0.0021
SW Lac    I      201.2550+-0.0004             II     437.3482+-0.0006
                    .2556+-0.0006                       .3481+-0.0005
          I      202.2174+-0.0003   U Peg     I      469.3859+-0.0009
                    .2177+-0.0002                       .3855+-0.0015
          I      461.3600+-0.0005             I      490.3789+-0.0004
                    .3592+-0.0006                       .3782+-0.0004
          I      480.2822+-0.0006   DI Peg    II     143.3560+-0.0017
                    .2823+-4.0003                       .3569+-0.0015
TZ Lyr    I      426.3931+-0.0005             I      144.a227+-0.0006
                    .3920+-0.0004                       .4232+-0.0003
          I      435.3835+-0.0021   ER Vul    I      436.4446+-0.0004
                    .3858+-0.0009                       .4448+-0.0017
U Oph     I      416.3856+-0.0003             II     437.4958+-0.0008
                    .3853+-0.0003                       .4969+-0.0012

entry for each minimum is through the b filter, and the second
through the v filter. The filters are closely similar to the
standard BV filters. The minimum times were calculated by the
method of Kwee and Van Woerden (1). The errors are standard
errors.
    This work has been supported by Tubitak (Scientific and
Technical Research Council of Turkey), and by the National
Science Foundation through the grant Ast 78-12307 to Prof. T.J.
Herczeg of the University of Oklahoma.




                   Z. ASLAN, A. ASIR, S. ENGIN
                   Z. TUFEKCIOGLU, and N. YILMAZ
                   University Observatory
                   A.U. Fen Fakultesi,
                   Ankara, Turkey




Reference:
(1) K.K. Kwee and H. van Woerden, Bull. Astron. Neth.
         12, 327, 1956 [BIBCODE 1956BAN....12..327K ]