Table 3: Photometry, distance and extinction of the exciting stars.
HII region Star number V B-V U-B d (kpc) Av Notes
BFS8 5 13.582 1.035 -0.088 8.88 $\pm $ 0.61 4.32  
DA568 1 11.898 0.900 -0.182 5.04 $\pm $ 0.35 3.86  
  2 14.037 0.755 -0.037 4.74 $\pm $ 0.86 3.13  
BFS10 1 15.031 1.419 0.311 6.39 $\pm $ 0.67 5.48  
S138 1 15.014 1.578 0.547 2.91 $\pm $ 1.4 5.89 photometric
S141 1 14.282 0.969 -0.488 8.34 $\pm $ 0.6 4.46  
S152 4 11.925 1.002 -0.537 2.39 $\pm $ 0.21 4.65  
S153 1 11.38 0.466 -0.427 4.73 $\pm $ 0.6 2.43  
S156 1 11.234 0.979 0.257 2.87 $\pm $ 0.75 3.73  
S158 1 11.762 1.288 0.05 1.60 $\pm $ 0.17 5.21  
  2 12.093 1.321 0.647 4.24 $\pm $ 0.29 4.72  
S159 1 11.919 0.921 -0.261 2.97 $\pm $ 0.31 4.03  
S163 1 11.51 0.83 -0.14 2.93 $\pm $ 1.3 3.52  
  5 12.803 1.127 -0.029 3.38 $\pm $ 0.35 4.63  
  6 14.054 1.485 0.3785 4.28 $\pm $ 0.3 5.68  
  7 14.040 0.833 -0.079 5.63 $\pm $ 0.93 3.48  
S170 1 11.353 0.313 -0.477 3.55 $\pm $ 0.58 1.80  
  2 9.786 0.439 -0.358 2.60 $\pm $ 0.27 2.18  
  3 13.406 0.370 -0.258 6.52 $\pm $ 1.19 1.80  
  4 12.401 0.396 -0.329 3.78 $\pm $ 0.68 1.98  
  5 10.935 0.303 -0.457 1.43 $\pm $ 0.28 1.74  
S173 1 11.820 0.38 -0.45 3.78 $\pm $ 2.06 2.02  
  2 11.220 0.17 -0.64 4.02 $\pm $ 0.66 1.39  
  3 9.974 0.183 -0.502 2.27 $\pm $ 1.23 1.29  
S175 1 11.301 0.906 -0.196 1.09 $\pm $ 0.21 3.90  
S182 1 11.739 0.984 0.435 - -  
S187 1 13.570 1.236 0.254 1.44 $\pm $ 0.26 4.78  
  3 14.711 0.85 0.159 - -  
S192 1 13.743 0.751 -0.315 2.96 $\pm $ 0.54 3.39  
S193 1 12.368 0.565 -0.42 2.11 $\pm $ 0.39 2.75  
  3 14.598 0.615 -0.317 8.12 $\pm $ 1.56 2.84  
G137.8-1.0 1* 13.01 0.71 -0.41 6.78 $\pm $ 0.59 3.32 Muzzio & Rydgren (1974)
S196 4 12.183 0.530 -0.458 5.67 $\pm $ 0.59 2.65  
S203 3 15.439 1.0843 0.212 5.51 $\pm $ 2.65 4.21 B2V photometric
BFS31 1 12.670 1.018 0.175 1.71 $\pm $ 0.31 3.97  
S204 1 10.844 0.419 -0.57 3.98 $\pm $ 0.42 2.32  
S217 2* 11.32 0.42 -0.6 4.37 $\pm $ 0.37 2.35 Georgelin et al. (1973)
S219 1 14.387 0.726 -0.088 4.64 $\pm $ 0.85 3.06  
  4 12.06 0.498 -0.33 3.74 $\pm $ 0.62 2.39  
  7* 14.43 0.84 -0.04 3.90 $\pm $ 0.65 3.47 Lahulla (1987)
S256 2* 14.37 1.15 -0.03 2.14 $\pm $ 0.39 4.73 Moffat et al. (1979)
S258 2* 15.28 1.22 0.4 2.90 $\pm $ 0.51 4.57 Moffat et al. (1979)
S283 1* 13.12 1.30 1.01 1.24 $\pm $ 0.22 4.26 Moffat et al. (1979)
  2* 12.19 0.52 -0.52 8.11 $\pm $ 0.31 2.67 Turbide & Moffat (1993)
  5* 14.22 0.65 -0.4 7.39 $\pm $ 1.21 3.08 Moffat et al. (1979)
BFS53 1* 13.93 0.85 -0.23 4.01 $\pm $ 0.73 3.71 Moffat et al. (1979)
S294 1* 13.99 1.03 -0.03 3.24 $\pm $ 0.56 4.23 Moffat et al. (1979)
Notes: The asterisk following some star's number means that the photometry is coming from the literature whith reference in Col. 8. In Col. 6, the distance and its uncertainty (calculated from errors on the photometry, spectral type and luminosity class determination) is given.

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