Table 1: Observational data for the sample of 20 Galactic B Supergiants. Spectral types and V magnitudes are taken from Lennon et al. (1992) for all stars except HD 192660, HD 185859, HD 190066 and HD 64760. The references for the spectral types of these 4 stars are as follows: HD 192660 from Walborn (1971); HD 185859 from Lesh (1968); HD 190066 from Hiltner (1956) and HD 64760 from Hoffleit & Jaschek (1982) (from which the V magnitude of HD 64760 was also taken). V magnitudes for the remaining 3 stars were obtained from Fernie (1983). Values of (B-V)0 taken from Fitzgerald (1970). Absolute visual magnitudes, distance moduli and cluster associations have been taken from: 1. Brown et al. (1994), 2. Garmany & Stencel (1992) or 3. Humphreys (1978). For stars not associated with a cluster, an absolute visual magnitude scale based on spectral type (Egret 1978) was used. L1992 refers to archive data obtained from Lennon et al. (1992), INT2003 denotes data taken on the 2.5 m INT and RKP marks data supplied by Prinja.
HD No. Alias Sp. type V B-V MV Association m-M Optical IUE
37128 $\epsilon$ Ori B0 Ia 1.70 -0.19 -6.95 Ori OB1b 7.81 L1992 SWP30272
192660 - B0 Ib 7.38 0.67 -7.0 Cyg 0B8 11.83 INT2003 SWP44625
204172 69 Cyg B0.2 Ia 5.94 -0.08 -6.2 Cyg OB4 6.2 L1992 SWP48900
38771 $\kappa $ Ori B0.5 Ia 2.04 -0.18 -6.51 Ori OB1c 8.01 L1992 SWP30267
185859 - B0.5 Ia 6.48 +0.44 -6.6 - 13.08 INT2003 SWP47509
213087 26 Cep B0.5 Ib 5.46 +0.37 -6.2 Cep OB1 12.7 L1992 SWP02735
64760 - B0.5 Ib 4.24 -0.15 -6.2 - 10.44 RKP SWP53781
2905 $\kappa $ Cas BC0.7Ia 4.16 +0.14 -7.09 Cas OB14 10.23 L1992 SWP54038
13854 V551 Per B1 Iab(e) 6.47 +0.28 -6.73 Per OB1 11.82 L1992 SWP02737
190066 - B1 Iab(e) 6.53 +0.18 -6.1 - 12.63 INT2003 SWP18310
190603 V1768 Cyg B1.5 Ia+ 5.64 +0.54 -7.0 - 12.56 L1992 SWP4325
193183 - B1.5 Ib 7.01 +0.44 -6.24 Cyg OB1 11.33 L1992 SWP52716
14818 V554 Per B2 Ia 6.25 +0.30 -6.93 Per OB1 11.83 L1992 SWP18658
206165 V337 Cep B2 Ib 4.74 +.30 -6.44 Cep OB2 13.2 L1992 SWP06336
198478 55 Cyg B2.5 Ia 4.84 +0.40 -6.43 Cyg OB7 9.62 L1992 SWP38688
42087 3 Gem B2.5 Ib 5.75 +0.22 -6.26 Gem OB1 10.93 L1992 SWP08645
53138 24 CMa B3 Ia 3.01 -0.11 -7.1 - 10.11 L1992 SWP30271
58350 $\eta$ CMa B5 Ia 2.41 -0.07 -7.0 - 9.41 L1992 SWP30198
164353 67 Oph B5 II(Ib) 3.97 +0.02 -4.2 Coll 359 6.5 L1992 SWP08560
191243 - B5 II(Ib) 6.09 +0.16 -6.5 Cyg OB3 11.83 INT2003 SWP07737

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