COMMISSIONS 27 AND 42 OF THE IAU 
            INFORMATION BULLETIN ON VARIABLE STARS 
                         Number 3744 
 
                                           Konkoly Observatory 
                                           Budapest 
                                           7 July 1992 
 
                                           HU ISSN 0374 - 0676 
 
 
 

        FY PERSEI IS A SHORT PERIOD CATACLYSMIC VARIABLE 
 
 
The variability of FY Per was discovered by Morgenroth (1936). The history of the star's 
investigation, the preliminary results of photometric observations, the identification chart 
and the magnitudes of nearby stars are given in Shugarov (1980). 
  We obtained more than 400 UBV photoelectric observations during 1980-1992. The 
analysis of the observations revealed that the star showed a small outburst. The outburst 
duration is about 20d. The brightness range is 12.3m-13.5m in B. 
  The average color indices are B-V approx. +0.3m, U-B approx. -0.5m, 
that is typical for the cataclysmic stars. 
  The treatment of the observations shows that the system's light changes with the short 
period of about 1h33m and the amplitude of about 0.15m. 
  For the analysis of the light curve we calculated the magnitude deviations from the 
average nightly values, because the light of FY Per changes from night to night. 
  The light curve for such deviations constructed with the following elements: 
 
  J. D. min. = 2447494.4403+0.0648479d x E 
 
is given in Figure 1. 


                                    [FIGURE 1]

                  Figure 1. The mean light curve of FY Per.

 
  Note that in some night the above period was not revealed. 
  In the nearest future we intend to publish a more detailed light curve in the different 
photometric systems and make a comprehensive analysis of the outburst activity. 
 
 
                         A.V. SAZONOV, S.Yu. SHUGAROV 
                         Sternberg State Astronomical 
                         Institute, 
                         119899, Moscow 
                         Russia 
 
 
 
References: 
 
Morgenroth, O.: 1936, Astron. Nachr. 261, 261.  [BIBCODE 1936AN....261..261M ]
Shugarov, S. Yu.: 1980, Astron. Tsirk. No. 1119, 3 (in Russian).  [BIBCODE 1980ATsir1119....3S ]