COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       Number 1102

                                   Konkoly Observatory
                                   Budapest
                                   1976 February 12



  PHOTOELECTRIC V LIGHT CURVE OF THE ECLIPSING BINARY RT PERSEI



      We made 911 photoelectric observations, in V light, of the
eclipsing binary RT Persei (BD+46d0740) by the 40 cm Cook 
refractor of the Teramo Observatory during 18 nights from the end of
1971 to the end of 1973. We used a photometer equipped with an
EMI 9502 photomultiplier and a Schott GG14+GG13 filter (2 mm).
We reduced in phase the observations by using the linear ephemeris

       (1) Hel.J.D. I = 2441304.3590+0.84939889d E.
                                 +-1       +-18
We computed (1) by the least square method from the times of 
minima: we got the last ones analizing our observed minima by the
Kwee and Van Woerden method and by using the preliminary elements
             T_0=2441304.3595
             P_0=0.84940032d
As comparison stars we used two anonymous field stars (Fig. 1).
The coordinates (related to the 1975 equinox) of the comparison
stars and the variable are as follow:
         a 3h22m36s                  46d  44.3'
         b 3 19 23                   46   22.5
         V 3 21 55                   46   29.5
We used "a" as comparison star and "b" as check star. The sequence
of observations has been:
                     sky, a, V, b, V,...
By doing so, we could exclude possible variability of the "a"
star with a good level of confidence.
From Fig. 2 we can see that the light-curve is variable in both
the levels of maxima and minima and, moreover, the latter  ones
are non symmetrical.
In a forthcoming paper we will discuss the photometric elements
of this variable derived by different methods of solution (Russell
and Merrill, 1952; Kitamura, 1965; Wood, 1971; Wilson and Devinney,
1971).

                     [FIGURE 1]

      Fig. 1. Chart of the variable RT Persei

                     [FIGURE 2]

      Fig. 2. Photoelectric observations of RT Persei


                 S. MANCUSO     L. MILANO
                 Capodimonte Observatory
                    Naples, Italy

References:
Kitamura, M., 1965, Advances in Astr.and Astrophys., 3, 27
Russell, H.N., Merrill, J.E., 1952, Contr.Princeton, 26 [BIBCODE 1952deeb.book.....R ]
Wilson, R.E., Devinney, E.J., 1971, Astroph.J., 166, 605 [BIBCODE 1971ApJ...166..605W ]
Wood, D.B., 1971, Astron.J., 76, 701 [BIBCODE 1971AJ.....76..701W ]