COMMISSION 27 OF THE I.A.U.
        INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 104



                                         Konkoly Observatory
                                         Budapest
                                         11 September 1965

                RR LYRAE VARIABLES IN M 92


   New observation of M 92 were made at the Main Astronomical
Observatory of the Academy of Sciences of the Ukrainian SSR during
1964 - 1965. The procedure of determining magnitudes was described
in (1). On the basis of the examination of all the 311 plates
available the elements of variables No. 1, 2, 3, 4, 5 and 8 were
revised and those for No. 7, 9, 10 and 11 were deduced. Data for
variables in M 92 are given in the following table where

  epsilon = (Tmax - Tmin) / P and xi = m (1/2P) - 1/2 (M + m)

  Var  Max JD.hel  Period         M 	   m       epsilon   xi     Remarks
       243..

 1    7403.659     0.7027144day  14.40mag 15.86mag  0.185   0.42mag     1

      8170.329      .7028410

 2    7427.366      .6438833       .48      .76      .155    .44        2

 3        .120      .6374495       .33      .81      .165    .65

 4        .210      .6289248       .34      .62      .140    .48

 5        .664      .6197346       .40      .77      .150    .63        3

       871.394      .6196854

 7        .517      .5149114       .45      .70      .200    .07        4

 8     427.185      .6732563       .54      .70      .110    .46        5

 9     871.181      .6083514       .53      .77      .100    .46

10     427.191      .3772912       .76      .64      .370    .06        6

11        .096      .3084614     15.08      .63      .350    .05        7


Remarks

1. A change of the period occurred at about J.D. 2438170.

2, 5, 7. Blashko effect. M is the mean of maximum and
         minimum amplitudes.

3. A change of the period occurred at about J.D. 2437871.

4. The brightness values M=14.01mag and m=14.52mag were observed.
   This star seems to be an ordinary cluster variable blended
   by a star of 14.88 mag.

6. Two small changes of the period were found at about
   J.D. 2438170 and 2438230.



Reference

(1) Inf. Bull. Var. Stars
    Comm. 27 I.A.U.
    43, 1964 [IBVS 43]



Kiev, 27 August 1965


                          E. S. KHEYLO
                    Main Astronomical Observatory
                   of the Academy of Sciences of the
                         Ukrainian SSR