Table 1: Photometric and spectroscopic information for individual stars analysed in this work.
ID V (B-V) (U-B) SpT eqw4428 $V_{\circ} - M_v$ Cross ref.
CBN84332.2-455337 10.1 0.30 -0.41 B2IV 0.60 11.1 LS1132
CBN84433.4-454115 10.4 0.23 -0.47 B2III 0.85 12.5 2MASS 8443341-4541167
CBN84501.9-455034 10.4 0.18 -0.45 B2IV 0.73 11.9 CD-454491
CBN84446.2-460433 10.7 0.08 -0.49 B3V 0.60 11.2 CD-454481
CBN84324.0-460831 10.8 0.50 -0.50 O7.5V 1.90 12.8 LS1131 $^{\blacktriangle}$
CBN84447.2-455856 10.8 0.51 -0.36 WN8 $^{\diamondsuit}$ ... ... LS1145
CBN84506.0-455008 10.9 0.25 -0.35 B2V 0.60 11.3 CD-454493
CBN84349.6-460711 10.9 0.34 -0.61 O6.5V((f)) 1.60 13.5 LS1135 $^{\varnothing}$
CBN84447.4-460339 11.1 0.09 -0.39 B3-5V 0.70 11.4 CD-454483
CBN84510.4-455854 11.2 0.55 -0.48 O9.5II 2.50 13.8 CPD-452977
CBN84504.8-460013 11.2 0.14 -0.44 B2V 0.70 12.2 CD-454492
CBN84406.6-455642 11.3 0.17 -0.32 B2V 0.80 12.2 CD-454466?
CBN84424.9-455334 11.3 0.61 -0.44 O7.5V 1.90 12.9 LS1144 $^{\blacktriangle}$
CBN84426.0-455749 11.4 0.25 -0.16 B8V 0.60 10.3 CD-454473
CBN84450.1-455648 11.4 0.16 -0.51 B2V 0.80 12.3 CD-454484
CBN84350.9-460348 11.4 0.45 -0.49 O9-9.5V 1.90 13.0 LS1137
CBN84506.3-460906 11.5 0.55 -0.47 B0IIIe 1.90 12.5: LS1147 $^{\blacktriangle}$
CBN84543.1-460742 11.5 0.10 -0.42 B2-3V 0.40 12.4 CPD-453000
CBN84450.9-461012 11.6 0.47 -0.48 B1III 2.38 13.4 LS1146 $^{\blacktriangle}$
CBN84404.4-455316 11.7 0.68 -0.33 B0III 2.27 13.2 LS1140
CBN84339.5-455148 11.7 0.54 -0.14 B2III 0.74 12.9 CPD-452909
CBN84518.6-454543 11.8 0.27 -0.30 B2V 0.48 12.4 CPD-452984
CBN84325.3-460750 11.8 0.25 -0.05 B8-A0V 0.40 10.4 CPD-452901
CBN84552.3-460929 11.8 0.10 -0.41 B5V 0.44 12.1  
CBN84359.6-460237 12.0 0.20 -0.28 B5-8V 0.70 11.5 CPD-452926
CBN84338.5-460817 12.0 0.45 -0.52 O9.5V 1.90 13.5 CPD-452910
CBN84349.4-454204 12.0 0.29 -0.25 B3-5V ... 11.7 CPD-452917
CBN84443.0-455130 12.0 0.21 -0.28 B8V 0.50 11.0 CPD-452953
CBN84318.7-460742 12.2 0.24 -0.19 B8V ... 11.1 CPD-452895
CBN84438.9-460746 12.2 0.10 -0.36 B5V 0.50 12.4 2MASS 8443908-4607450
CBN84327.7-460929 12.3 0.63 -0.58 B0V-III 2.20 13.4 2MASS 8432796-4609263
CBN84348.6-460736 12.3 0.40 -0.47 B1-1.5V 1.70 12.9 2MASS 8434879-4607337
CBN84434.3-455214 12.5 0.23 -0.30 B5V 1.40 12.3 2MASS 8443427-4552136
CBN84505.0-460300 12.6 0.16 -0.37 B2.5-3V 0.40 12.9 2MASS 8450512-4602598
CBN84446.7-454632 12.6 0.46 -0.09 B3-5V 0.40 11.8 2MASS 8444674-4546333
CBN84327.4-460240 12.6 0.56 -0.44 B0V 1.60 13.4 2MASS 8432763-4602382
CBN84500.4-455834 12.6 0.24 -0.34 B5V 0.70 12.3 2MASS 8450044-4558343
CBN84505.7-454040 12.7 0.60 -0.31 B1III 2.60 14.0 2MASS 8450573-4540420
CBN84526.1-460527 12.9 0.66 -0.09 B2III 2.10 13.8 2MASS 8452620-4605258
CBN84350.7-455820 12.9 0.55 -0.34 B1.5V 2.60 12.5 2MASS 8435084-4558194
CBN84344.7-460656 12.9 0.43 -0.44 B1V 1.90 13.5 2MASS 8434493-4606537
CBN84522.4-455527 13.0 0.72 -0.24 B1III 2.60 13.9 2MASS 8452244-4555280
CBN84502.0-455257 13.2 0.23 -0.11 B8-A0V 0.70 11.8 2MASS 8450219-4552572
CBN84410.6-455452 13.3 0.37 -0.08 B5-8V 0.80 12.2 2MASS 8441074-4554522
CBN84419.9-455552 13.5 0.65 -0.08 B2III 2.90 14.3 2MASS 8441999-4555524
CBN84458.5-455242 13.5 0.24 -0.11 B8-9V ... 12.3 2MASS 8445857-4552434
CBN84431.5-455314 13.5 0.61 -0.34 B2III: 2.36: 14.3: 2MASS 8443163-4553148
CBN84518.2-455816 13.6 0.65 -0.32 B0.5V 3.00 14.1 2MASS 8451822-4558166
CBN84423.1-460821 13.7 0.65 -0.33 B1-2/V-III 1.80 14.0  
CBN84325.6-460820 13.7 0.62 -0.34 B2Ve 2.00 14.5: 2MASS 8432574-4608174
CBN84421.9-455136 13.7 0.66 -0.24 B1V 3.48 13.9  
CBN84437.8-455257 13.8 0.43 -0.32 B8-A0V 0.30 11.8 2MASS 8443788-4555288
CBN84510.9-455900 14.0 0.61 -0.31 B1V 2.32 14.2  
CBN84442.0-460802 14.1 0.51 -0.14 B2V 1.10 14.0 2MASS 8444210-4608004
CBN84346.7-460641 14.2 0.37 -0.43 B1-5V 2.20 14.2 2MASS 8434686-4606390
CBN84430.9-455442 14.2 0.53 -0.30 B2V 1.77 14.1  
CBN84523.5-455340 14.3 0.51 -0.06 B8V 1.80 12.4 2MASS 8452359-4553411
CBN84416.7-461121 14.3 0.53 -0.25 B1.5V 1.90 14.2 2MASS 8441683-4611189
CBN84423.2-455337 14.5 0.58 -0.24 B1.5-2V 1.15 14.1 2MASS 8442335-4553371
CBN84418.2-455307 14.6 0.56 -0.32 B1V 1.30 14.7 2MASS 8441838-4553078
CBN84414.0-455733 14.7 0.76 -0.16 B1.5-2V 1.90 13.9 2MASS 8441413-4557329
CBN84421.9-460125 14.8 0.49 -0.27 B1V 2.00 15.2 2MASS 8442208-4610224
CBN84518.8-454147 14.8 0.57 -0.13 B5V 0.87 13.3 2MASS 8451888-4541494
CBN84527.2-455360 14.9 0.49 +0.01 B5-8V 1.14 13.5 2MASS 8452725-4554006
$^{\diamondsuit}$ van der Hucht (2001).
Column 1 lists the stars' identification according to the guidelines of the IAU, i.e., using the (capitalized) first letters of the last names of the authors and the numbers, of the celestial coordinates in the J2000.0 frame. Columns 2 to 4 list the UBV magnitude and colours; the MK spectral classification is listed in Col. 5. The $\lambda $4428 equivalent width is showed in Å in Col. 6. Column 7 shows the spectrophotometric distance modulus determined adopting the absolute magnitudes corresponding to the spectral types, according to the calibration by Martins et al. (2005) for O spectral types and Schmidt-Kaler (1982) for B spectral types. Column 8 includes the cross reference for these stars, where LS indicates stars in the Luminous Star Catalogue (Stephenson & Sanduleak 1971), CD indicates stars in the Córdoba Durchmusterung catalogue, CPD indicates stars in the Cape Photographic Durchmusterung catalogue, and 2MASS indicates stars in the 2MASS catalogue (Cutri et al. 2003).


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