COMMISSION 27 OF THE I. A. U.
               INFORMATION BULLETIN ON VARIABLE STARS
                          Number 3597

                                                     Konkoly Observatory
                                                     Budapest
                                                     6 May 1991

                                                     HU ISSN 0374 - 0676


             HD 105759, A NEW SHORT PERIOD VARIABLE STAR

  During an observational program on the variable star FG Vir, it turned
out that the star HD 105759, used as a check star, shows systematic variation.
  This star was not reported in the "Catalog of Stars Suspected of 
Variability" nor in the more recent edition of the GCVS.
  The observations were made during the nights of 1991 March 13, 23;
April 03, 13 with the 0.40 m reflector at the "A. Righi" observatory in
Reggio Calabria - Italy and given in use at the "Gruppo Astrofili Reggini
M31 del DLF", A photomultiplier EMI 9789 QB with Johnson's V filter and
photon counting was used.
  The elaboration of data obtained on the first two nights showed that
HD 105759 had a variation of about 0.05 magn. with respect to HD 105654 with
a probable period of 0.045 day.


                              [FIGURE 1]

 Figure 1   Light curve of HD 105759 in the V filter on March 23th.


    The variation was confirmed on the two last nights when HD 105654
and HD 107830 were used as comparison and check stars respectively.
    In Figure 1 the magnitude differences with respect to HD 105654 are
plotted for the night of 23 March 1991.



                                 A. COLOMBA, G. De BENEDETTO, A. IELO
                                 Gruppo Astrofili Reggini "M31" del DLF
                                 Casella Postale 148
                                 I-89100 Reggio Calabria
                                 Italy



References:

Kholopov, P.N. et al.: General Catalogue of Variable Stars Vol. IV. 
   (Moscow, 1990.)
New Catalogue of Suspected Variable Stars (Nauka, 1982),