COMMISSION 27 OF THE I. A. U.
             INFORMATION BULLETIN ON VARIABLE STARS
                         Number 3088


                                          Konkoly Observatory
                                          Budapest
                                          17 September 1987

                                          HU ISSN 0374-0676

     
    NEW OBSERVED TIMES OF MINIMA FOR EE Aqr, RV Gru and RW PsA

  UBVRI photometric observations of these three short period eclipsing
binaries were carried out at La Silla (ESO) during the period 27 August-
2 September 1986 with the ESO 50 cm telescope. Simultaneous spectroscopic 
observations were also performed for these systems.
  For each program star one primary minimum could be observed; the times
of minima given below are obtained from averages on the five colours:

                  EE Aqr         RV Gru        RW PsA
T(hel.prim.min) 2446674.5897  2446673.8810  2446675.6850

  From these and using all the other observed times of minima found in
literature the following new ephemerides could be computed:


                        [FIGURE 1]
                        [FIGURE 2]



EE Aqr Hel.J.D.(prim.min.) * 2440828.7809 + E*0.50899513
                                 +/-.0003   +/-.00000005

RV Gru                       2442655.7905 + E*0.25951625
                                 +/-.0002   +/-.00000004

RW PsA                      2434328.4684 + E*0.36045011
                                +/-.0008   +/-.00000004



                Table I

Star           (1950)      (1950)    S.T.    m
EE Aqr       22 31 59     -20 07.1    F0    8.0
SAO 165165   22 31 42     -19 18.6    F8    8.5
SAO 165157   22 30 25     -19 38.9    A0    9.1
RV Gru       22 36 25     -47 08.0         11.3
SAO 231212   22 33 38     -46 43.1    K0    9.3
SAO 231204   22 32 12     -47 38.1    G5    9.8
RW PsA       22 06 56     -27 18.9         11.0
SAO 190916   22 06 08     -27 26.5    K2    9.0
SAO 190901   22 04 51     -28 18.2    G0    7.9


                             [FIGURE 3]


  A more complete presentation of the observations will follow in some forthcoming
papers. The identifications of comparison and check stars as well as the
corresponding finding charts, for each variable star are also given in Table I,
and Figures 1 - 3, respectively.




  E. COVINO (1), L. MILANO (2)
  D. DE MARTINO (1), A.A VITTONE (1)

(1) Osservatorio di Capodimonte Napoli, ITALY
(2) Dipartimento di Fisica
  Universita di Napoli ITALY

References:
Chambliss, C.R. 1970, Astron.J. 75,725. [BIBCODE 1970AJ.....75..725C ]
Duerbeck, H.W., Walter, K. 1983, Astron. Astrophys. Supp. 54,545. [BIBCODE 1983A&AS...54..545D ]
Dworack, T.Z., 1987, I.B.V.S. No 2991.
Padalia, T.D., 1979, Astrophys. Space Science., 62, 477. [BIBCODE 1979Ap&SS..62..477P ]
Williamon, R.M., 1974, Astron. J., 79, 1093. [BIBCODE 1974AJ.....79.1093W ]