COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                     Number 3127



                                      Konkoly Observatory
                                      Budapest
                                      4 January 1988

                                      HU ISSN 0374-0676


          TIMES OF MINIMA OF SOUTHERN ECLIPSING BINARIES


   As part of an extensive program devoted to search for periods, times of
minimum light and period variations of bright southern close binaries, we
present here photoelectric minima for RS Sgr, RR Cen, and IT Nor.
   Observations were made between 1985 and 1987 at the Yale Southern Station
of Felix Aguilar Observatory (San Juan, Argentina) with the 76 cm reflecting
telescope, refrigerated RCA 31034 photomultiplier and photon counting 
techniques. The usual symmetrical pattern was followed during the measurements
through the filters, in alternative sequences variable-comparison star and
sky reading. The following times of minimum were determined:

   Star   Filter   Min       HJD         m.e.
                             2440000+
 RS Sgr   V        I         6296.5126  0.0048
 RS Sgr   B        I         6296.5120  0.0060
 RS Sgr   U        I         6296.5106  0.0065
 RS Sgr   V        I         6622.6362  0.0006
 RS Sgr   B        I         6622.6356  0.0049
 RS Sgr   U        I         6622.6359  0.0040
 RR Cen   V        I         6621.6678  0.0034
 RR Cen   B        I         6621.6677  0.0041
 RR Cen   U        I         6621.6677  0.0046
 IT Nor   V        I         6623.7370  0.0048
 IT Nor   B        I         6623.7369  0.0074
 IT Nor   U        I         6623.7372  0.0106
 IT Nor   V        II        6624.7151  0.0049
 IT Nor   B        II        6624.7151  0.0047
 IT Nor   U        II        6624.7151  0.0032
 
A study of the period of RS Sgr and a light curve analysis of IT Nor will
be published elsewhere.


  MIGUEL ANGEL DE LAURENTI              MIGUEL ANGEL CERRUTI
  Observatorio Astronomico Mercedes     IAFE
  Calle 29 No. 575                      CC 67 Suc 28
  6600 Mercedes (Buenos Aires)          1428 Buenos Aires
  Argentina                             Argentina