COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                        Number 2887

                                         Konkoly Observatory
                                         Budapest
                                         10 April 1986

                                         HU ISSN 0374 - 0676



              OBSERVATIONS OF W SERPENTIS STARS



    Observations have commenced at the Stephen F. Austin State
University Observatory in Nacogdoches, TX USA on the strongly interactive
W Serpentis binary star systems. The observing program has been described in
Wilson, et al. (.1984). We employ the newly completed 1.04 m automated telescope
(Markworth and Rafert, 1984), equipped with a Starlight-1 pulse
counting photometer. This photometer is equipped with an EMI 9798A (S-20)
photomultiplier and filters that together closely match the B, V, and R of
the standard UBV system. Also used in these observations is the 46 cm.
telescope at the same site, equipped with an identical photometer.
     Because of the long orbital periods of W Ser stars each observation
listed below consists of (typically) four differential measures of the variable
in each of the three colors extending over 15 - 25 minutes. Although
phase coverage on individual stars is, as yet, limited, preliminary analysis
has begun. Observations of the W Ser stars are continuing.


      Star            Date Observed (1985)

      KX And        July 29/30, August 25/26
      BM Cas        July 25/26, 29/30, 30/31	
                    August 1/2  , 3/4, 6/7, 10/11
                           13/24
      SX Cas        August 25/26

      U Cep         August 13

      KU Cyg        August 1/2, 6/7, 9/10

     V367 Cyg       July 28/29, 29/30, 30/31
                    August 1/2, 3/4, 6/7, 9/10,
                        10/11, 25/26

     V1507 Cyg      June 7/8, 13/14
                    July 28/29, 29/30
                    August 1/2, 6/7, 9/10, 25/26



    RZ Oph        June 7/8, 13/14
                  July 23/24, 25/26
                  August 3/4, 6/7, 9/10, 21/22

    AG Peg        August 9/10, 25/26

    V453 Sco      July 9/10, 12/13, 15/16, 25/26,
                      31/01
                  August 1/2; 3/4, 8/9, 10/11

    W Ser         June 7/8
                  July 12/13, 13/14, 23/24, 24/25,
                      25/26
                  August 3/4, 6/7, 8/9, 9/10,
                       10/11,21/22, 26/27


    V356 Sgr     July 12/13, 13/14, 14/15, 23/24
                      24/25, 25/26
                   August 1/2, 3/4, 6/7, 8/9, 9/10,
                       10/11, 17/18, 21/22

    HD 207739      July 29/30
                   August 28/29


This work is supported by the U.S. National Science Foundation under
Grant Number AST 840-1479


                       N.L. MARKWORTH
                       R.L. GANN
                       Stephen F. Austin State University
                       Dept. of Physics and Astronomy
                       Nacogdoches, TX 75962



                      J.B. RAFERT
                      E. SMITH
                      Florida Institute of Technology
                      Dept. of Physics and Space Sciences
                      Melbourne, FL 32901


                      R.E. WILSON
                      University of Florida
                      Dept. of Astronomy
                      Gainesville, FL 32611


References:


Markworth,N.L. and Rafert, J.B., 1984,"A 41- inch Telescope
   for East Texas", Microcomputers in Astronomy II, ed.
   R.M. and K.A. Genet. [BIBCODE 1984mca2.conf....9M ]

Wilson, R.E., Rafert, J.B., and Markworth, N.L., 1985," The
   W Serpentis Stars", Comm. I.A.P.P.P. #16,1 [BIBCODE 1984IAPPP..16....1W ]