COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1537

                               Konkoly Observatory
                               Budapest
                               1979 January 25




          EH Lib - STAR WITH BLAZHKO EFFECT


   In 1974 through 1978 over 700 photoelectric observations of
the supershortperiodic cepheid EH Lib were obtained in BV colours
at the Astronomical Observatory, Odessa University. The moments
of maxima for 1974-1976 have been published in IBVS No. 1310, 1977.
Six moments of maxima determined in 1978 are as follows:


               Table 1
---------------------------------------
Max.J.D.hel    *         E        O-C
---------------------------------------
2443695.4285   B       116010   -0.0029
    695.4303   V       116010   -0.0011
    696.4051   B       116021   +0.0010
    696.4008   V       116021   -0.0032
    698.3454   B       115043   -0.0037
    698.3456   V       116043   -0.0035
---------------------------------------


Epochs and deviations have been calculated with the elements
given in the third supplement to the General Catalogue of Variable
Stars, 1969:

Max.J.D.hel.= 2433438.6073+ 0.088413276d E.

We could determine stellar magnitudes of the variable in all
the 28 light maxima. These data are given in Table 2.


            Table 2
---------------------------------
Max.J.D.hel.  B_max   V_max  psi
---------------------------------
2442162.5181  9.72    9.46   0.86
   2182.4134  9.70    9.42   0.53
   2541.4588  9.65    9.45   0.98
   2544.3758  9.73    9.49   0.63
   2544.4653  9.70    9.48   0.96
   2577.4438  9.60    9.35   0.41
   2871.5070  9.67    9.37   0.51
   2871.5932  9.73    9.49   0.82
   2872.4772  9.67    9.42   0.05
   2872.5658  9.68    9.38   0.37
   2874.5107  9.68    9.43   0.48
   3695.4291  9.71    9.45   0.96
   3696.4000  9.70    9.43   0.50
   3598.3457  9.70    9.43   0.61
---------------------------------

    Light variations in maxima amount to 0.13m-0.14m that is to
one order more than the errors of observations. Suppose these
variations are caused by the Blazhko-effect, then we find the
formula below

          M = 2442162.556 + 0.273778d  E

with the help of which phases psi given in the last column of
Table 2 have been calculated.

                        [FIGURE 1]

    The graphs of light variations in maxima are illustrated
in Figure 1.


                         V.G. KARETNIKOV
                         Yu.A. MEDVEDEV
                         Astronomical Observatory
                         of the Odessa University
                         U.S.S.R.