COMMISSIONS 27 AND 42 OF THE IAU
                INFORMATION BULLETIN ON VARIABLE STARS
                             Number 4084

                                                    Konkoly Observatory
                                                    Budapest
                                                    13 September 1994

                                                    HU ISSN 0374- 0676


       PHOTOMETRY OF THE SHORT PERIOD ECLIPSING BINARY FR ORIONIS


  FR Ori (=282.1934=HD 248406; m=11.0-11.9pg; Sp:A7) was discovered photographically 
by Hoffmeister (1934) to be a short period variable. Soloviev (1937), having used
his visual observations, determined a period of the binary with high accuracy. The star
was observed visually by Szafraniec (1974) and photographically by Gaposhkin (1954).
The following ephemeris of FR Ori is given in the GCVS:

            Min I=HJD 2427862.159 + 0.88316217d x E

  Our observations of the binary were obtained with the 0.6m telescope at Mt. Maidanak 
in 1989/92. The star BD+9d972 (V=9.46m; U-B=0.069m; B-V=0.32m, V-R=0.18m;
Sp:F2) was chosen as a comparison one. The total number of the observations are 144
in U, 181 in B, 183 in V and 176 in R. Having used all published times of minima we
improved the ephemeris of the binary by the method of the least squares:

            Min I=HJD 2432508.4774  + 0.88316188d x E
                         +/-0.0002 +/-0.00000004

  The O-C residuals are given in Table 1 and shown in Figure 1. The light curves of
FR Ori are shown in Figure 2. In Table 2 we list the main characteristics of the curves.


                                [FIGURE 1]

                    Figure 1. O-C diagram for FR Ori.


                  Table 1. O-C residuals for FR Ori.

Observers                   Type         HJD 2400000     E         O-C
Soloviev (1937,1951)        pg            24845.289    -8677       0.012d
                            v             27846.277    -5279       0.015
                                          27862.165    -5261       0.006
                                          27869.231    -5253       0.007
                                          27892.190    -5227       0.003
                                          28155.363    -4929      -0.006
                                          28488.320    -4552      -0.001
                                          28510.386    -4527      -0.014
                                          28824.806    -4171       0.000
Szafraniec (1974)           v             32508.479        0       0.003
                                          32615.345      121       0.007
                                          32894.424      437       0.007
                                          33265.339      857      -0.006
                                          33596.529     1232      -0.002
                                          33681.312     1328      -0.002
                                          33689.265     1337       0.002
                                          34043.413     1738       0.002
                                          34452.313     2201      -0.002
                                          34685.468     2465      -0.002
                                          35071.418     2902       0.006
                                          35473.247     3357      -0.004
                                          35904.236     3845       0.002
                                          36629.311     4666       0.001
Klimek (1972)               v             41368.366    10032       0.008
Kreiner, Mirtzcka (1980)    v             42812.314    11667      -0.014
Dedoch (1992)               v             47868.429    17392      -0.003
present paper               pe            48572.311    18189      -0.001
                                          48926.458    18590      -0.002
                                          48927.345    18591       0.002


           Table 2. Photometric parameters of FR Ori.

		V       U-B   B-V    V-R
Max           10.71   +0.18   0.37   0.34
Min I         11.70    0.20   0.41   0.43
Min II        10.84    0.17   0.34   0.31


                                [FIGURE 2]

                    Figure 2. The light curves of FR Ori.



                           Mamnun ZAKIROV
                           Ulugh Beg Astronomical Institute
                           Astronomicheskaya st. 33
                           Tashkent, 700052, Uzbekistan



References:

Dedoch, A., 1992, Brno Obs. and Plan. Contr., 30, 19
Gaposhkin, S., 1954, Harv. Ann., 113, 69 [BIBCODE 1953AnHar.113...67G ]
Hoffmeister, C., 1934, Astron. Nachr., 253, 195 [BIBCODE 1934AN....253..195H ]
Klimek, Z., 1972, IBVS, No. 637, 1
Kreiner, J. M., Mirtzcka, A., 1980, Astron. Nachr., 301, 327 [BIBCODE 1980AN....301..327K ]
Soloviev, A. V., 1937, Tadjik Obs. Circ., No. 25, 3
Soloviev, A. V., 1951, Peremen. Zvezdy, 8, 50
Szafraniec, R., 1974, Acta Astron., 24, 89 [BIBCODE 1974AcA....24...89S ]