Table 6: uvby$\beta $ indices obtained for V2109 Cyg and comparison stars. The pairs below the star names are the number of points collected for each object in uvby and $\beta $, respectively. For comparison, the values available from the bibliography are listed in the bottom part. The values listed for the variable are "mean values'' based on the normal points along the cycle (Table 7). For this star, the comparison with the earlier available Strömgren indices (bottom part) must be made at phase 0.15 where the indices are, according to Table 7: $V=7\hbox{$.\!\!^{\rm m}$ }438$, $b-y=0\hbox{$.\!\!^{\rm m}$ }214$, $m_1=0\hbox{$.\!\!^{\rm m}$ }171$ and $c_1=0\hbox{$.\!\!^{\rm m}$ }874$.
Star V    b-y  m1  c1  $\beta $  
V2109 Cyg 7.494 0.226 0.172 0.838 2.740
(532, 172) 59 15 1 36 13
C1 = HD 189013 6.890 0.089 0.171 1.011 2.846
(475, 62)          
C2 = HD 191022 7.438 0.413 0.192 0.391 2.603
(252, 37) 3 3 3 10 7
C3 = HD 193701 6.981 0.301 0.167 0.503 2.659
(5,5) 5 3 3 3 5
V2109 Cyg 7.435 0.202 0.183 0.873 -  
C1 = HD 189013 6.885 0.089 0.176 1.015 2.843
C2 = HD 191022 7.444 0.410 0.190 0.382 2.602
C3 = HD 193701 6.978 0.307 0.162 0.512 2.663


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