COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1155


                               Konkoly Observatory
                               Budapest
                               1976 July 22


         A NEW RR LYRAE STAR IN COMA BERENICES


   Wing (1973) published a photoelectric sequence for the 
radio-source ON 231. We have found (Veron and Veron 1975) than star
F of this sequence is variable; from the color of this object 
measured by Wing (B - V = 0.35, U - B = .09), the amplitude and rate
of change, we have suggested that it is an RR Lyrae.
    Between May 1972 and May 1976, we got a total number of 40
plates of this field on which star F could be measured; 9 with
the one meter (f/7) Ritchey-Chretien telescope of the Wise Observatory, 
located at Mitzpe-Ramon, Israel and 31 with the franco-
belgian (60/210) Schmidt telescope of the Haute-Provence Observatory. 
The r.m.s. uncertainty for the first set of plates is a =
0.007 mag., for the second, it is sigma = 0.12. We have analysed
these data using the autocorrelation method developed by Lafler
and Kinman (1965); we obtained, by this way, a period P = 0.64527
day. The light curve is shown in Figure 1, its shape confirms
that this star is indeed an RR Lyrae.

   The position of the star is:

       alpha = 12h19m08.8s       delta = + 28deg31'48" (1950.0).


                            M.P. VERON and P. VERON
                            Observatoire de Meudon


References:
    Lafler, J., Kinman, T.D. 1965, Astrophys.J. Suppl. 2, 199. [BIBCODE 1965ApJS...11..216L ]
    Veron, P. and Veron, M.P. 1975, Astron.Astrophys. 39, 281. [BIBCODE 1975A&A....39..281V ]
    Wing, R.F. 1973, Astron.J. 78, 684. [BIBCODE 1973AJ.....78..684W ]

                     [FIGURE 1]