Table 3: Amplitudes, $\Delta V_0$ and $\Delta V_1$, of f0=25.5769 cd-1 and f1, respectively, determined from different data sets by Fourier analysis.
Year $\Delta V_0$   f1   $\Delta V_1$   Source Notes
  (mmag) (cd-1) (mmag)    
1993 140.4 - - 1  
  2.6        
1994 160.3 - - 1  
  2.1        
1995 146.5 32.567 9.0 1  
  1.3   1.3    
1996 141.6 - - 1  
  2.0        
1996 142.8 32.689 13.2 2 a
  4.1   4.1    
1996 159.8 32.706 13.7 2 b
  4.4   4.4    
1996 146.8 31.593 11.5 3  
  1.1   1.1    
1999 145.7 31.676 7.0 4 c
  0.5   0.5    
2000 149.1 31.683 10.0 5  
  1.3   1.3    
2001 151.9 - - 5  
  2.6        
2001 138.1 31.629 17.0 6  
  1.3   1.3    
2003 153.8 32.711 14.4 2 d
  1.0   1.0    
2003 146.9 30.618 9.6 7 e
  1.0   1.0    
2004 137.3 - - 8 f
  5.4        
2004 144.8 - - 9  
  2.4        
2005 149.3 - - 9  
  5.8        
Sources: 1) Hintz et al. (1997), 2) present work, Château-Renard Observatory, 3) Zhou et al. (1999), 4) Zhou et al. (2001), 5) Kim et al. (2003), 6) Wolf et al. (2002), 7) present work, Xinglong Station, 8) present work, McDonald Observatory, 9) present work, Mo i Rana Observatory. Notes: a) observations in Johnson B filter, $\Delta V$ is determined from $\Delta V=0.80\Delta B$ (see text), b) observations in R filter, $\Delta V$ is determined from $\Delta V=1.36\Delta R$ (see text), c) another peak is detected at 32.5456 cd-1, with $\Delta V=5.6(\pm0.5)$ mmag and ${\it S/N}=5.6$, d) this data set include the data from October 2003 to February 2004. $\Delta V$ is calculated from $\Delta V=1.36\Delta R$ (see text), e)  f1=30.618 cd-1 can be an 1 cd-1 alias of 31.6 cd-1, although the corresponding amplitude S/N ratio is rather low ( ${\it S/N}=3.9$), f) observations in filter S (Schott BG40), $\Delta V$ is determined from $\Delta V=0.88\Delta S$ (see text).

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