Table 6: Derived CNO abundances for the sample of Galactic B supergiants (expressed as log  $\left(\frac{N_{\rm x}}{N_{\rm H}}\right) + 12$). The amount of nitrogen enrichment relative to carbon and oxygen respectively is given in the last two columns, calculated as log  $\left(\frac{N_{\rm x}}{N_{\rm H}}\right)_{*} -$ log  $\left(\frac{N_{\rm x}}{N_{\rm H}}\right)_{\odot}$.
HD No. Sp. type $T_{\rm eff}$ v$_{\rm e}$ sin i C N O N/C N/O
SUN G2 V 5770 - 8.39 7.78 8.66 -0.61 -0.88
37128 B0 Ia 27 500 91 7.66 7.31 8.68 +0.26 -0.49
192660 B0 Ib 30 000 94 8.02 7.51 8.73 +0.10 -0.40
204172 B0.2 Ia 28 500 87 7.66 7.71 8.66 +0.66 -0.07
38771 B0.5 Ia 26 000 91 7.74 8.15 8.73 +1.02 +0.30
185859 B0.5 Ia 26 000 74 7.72 7.95 8.53 +0.84 +0.30
213087 B0.5 Ib 27 000 88 8.00 8.15 8.73 +0.76 +0.30
64760 B0.5 Ib 28 000 265 7.99 8.15 8.73 +0.77 +0.30
2905 BC0.7 Ia 23 500 91 7.99 8.16 8.80 +0.78 +0.24
13854 B1 Iab(e) 20 000 97 7.66 8.51 8.80 +1.46 +0.59
190066 B1 Iab(e) 21 000 82 7.88 8.15 8.53 +0.88 +0.50
190603 B1.5 Ia+ 19 500 79 7.48 8.76 8.73 +1.89 +0.91
193183 B1.5 Ib 18 500 68 7.66 8.15 8.73 +1.10 +0.30
14818 B2 Ia 18 000 82 7.66 8.72 8.90 +1.67 +0.70
206165 B2 Ib 18 000 73 7.96 8.15 8.43 +0.80 +0.60
198478 B2.5 Ia 17 500 61 7.86 8.29 8.45 +1.04 +0.72
42087 B2.5 Ib 18 000 71 7.76 8.11 8.80 +0.96 +0.19
53138 B3 Ia 16 500 58 7.78 8.32 8.60 +1.15 +0.60
58350 B5 Ia 15 000 50 7.78 8.29 8.75 +1.12 +0.42
164353 B5 Ib/II 15 500 44 7.78 7.89 8.53 +0.72 +0.24
191243 B5 Ib/II 14 500 38 7.70 7.65 - +0.56 -

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