COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                   Number 3117


                                    Konkoly Observatory
                                    Budapest
                                    8 December 1987

                                    HU ISSN 0374-0676



          1986 BV LIGHT CURVES OF BH VIRGINIS

  The first photometric observations of BH Virginis (HD12909) were made by
Kitamura et al. (1957) and Koch (1967). Further observations were carried out
by Sadik (1978), Hoffmann (1982), and Scaltriti et. al. (1985). Hoffmann (1982)
concluded that the observational characteristics of the system made it close to
short period RS CVn binaries (Hall 1976).

  BH Virginis is included in our program to monitor the RS CVn short period
systems. The observations were performed during the week 11-17 June 1986 at
the observatorio del Roque de los Muchachos with the 1 m Jacobus Kapteyn
telescope. We used the People's photometer and standard U,B,V,R,I filters (Jones
1984).

  Simultaneous measurements sky-star were made with both channels and the
signal to noise ratio was higher than 100 in all cases.

  HD121935 was chosen as the main comparison star, and the standard stars
were selected from Landolt (1983). After transformation to the standard system 
its magnitudes are in good agreement with the findings of Koch (1976) and
Scaltriti et al. (1985).

  The B and V light curves are shown in figures 1 and 2, where the differential
magnitudes are plotted against orbital phase calculated with the ephemerides of
Koch (1967).
           HJD= 2438107.19047 + 0.81687099d E




                           [FIGURE 1]
                           [FIGURE 2]


   The system shows no significant changes in both mean levels and depth
of eclipses compared to 1984 light curves (Scaltriti et el. 1985).

   In a further paper, we will present the results of the analysis of these
light curves and a discussion of their peculiarities.


M.J. AREVALO, B. ROBAYANA, J.J. FUENSALIDA
Instituto de Astrofisica de Canarias
38200 La Laguna, Tenerife
Canary Islands, Spain

D.K. BEDFORD
University of Birmingham
Dept. of Space Research
Birmingham B15 2TT, U.K.

References:

Hall. D.S.: 1976, in Multiple Period Variable Stars, I.A.U. Colloq. No 29, Pt 1, ed.
   W.S. Fitch (Reidel, Dordrecht), p. 287. [BIBCODE 1976ASSL...60..287H ]
Hoffmann, M.: 1982, Astron Astrophys. Suppls. Ser. 47, 561. [BIBCODE 1982A&AS...47..561H ]
Jones, D. 1984, R.G.O. La Palma, Technical Note, No. 10.
Kitamura, M. Nakamura, T. and Takahashi, C.: 1957, Publ.Astron.Soc.Japan 9, 191 [BIBCODE 1957PASJ....9..191K ]
Koch, R.H.: 1967, Astron.Journal 72,411 [BIBCODE 1967AJ.....72..411K ]
Landolt, A.U.: 1983, Astron.Journal 88, 439 [BIBCODE 1983AJ.....88..439L ]
Sadik, A.R.: 1978, PhD Thesis, University of Manchester [BIBCODE 1978PhDT.......296S ]
Scaltriti, F., Cellino, A. and Busso, M.: 1985, Astron.Astrophys. 149, 11. [BIBCODE 1985A&A...149...11S ]