Table 3: Properties of the early-type stars in the optical and X-ray domains. Background- and exposure-corrected source fluxes (in 10-5 photons cm-2 s-1) are estimated for each observation from the fluxed images in a region of radius r (in px) and for the 0.3-10. keV band. The last columns give the average hardness ratios and dereddened X-ray luminosity in 1032 erg s-1 and for the 0.5-10. keV energy band (see text for details). A colon (:) indicates an uncertain value.
Star Sp. Type $\log(L_{\rm BOL}/L_{\odot})$ $N_{\rm int}^{\rm H}/10^{22}$ r Mean ph. flux Obs 1 Obs 2 Obs 3 HR1 HR2 $L_{\rm X}^{\rm unabs}$ $\log(L_{\rm X}/L_{\rm BOL})$
WR20a WN6ha+WN6ha 6.28 1.13 4 11.87 $\pm$ 0.17 10.3 $\pm$ 0.4 11.2 $\pm$ 0.3 13.2 $\pm$ 0.3 0.64 $\pm$ 0.03 0.385 $\pm$ 0.012 51.7a -6.15
WR20b WN6ha 5.86 1.04 9 3.77 $\pm$ 0.09 3.69 $\pm$ 0.18 3.72 $\pm$ 0.15 3.88 $\pm$ 0.16 0.61 $\pm$ 0.08 0.656 $\pm$ 0.016 19.0a -6.16
HD?90273 O7I: 5.80: 0.22: 20 0.81 $\pm$ 0.06 1.03 $\pm$ 0.11 0.77 $\pm$ 0.09 0.66 $\pm$ 0.10 $-0.83\pm0.02$ $-0.79\pm0.24$ 2.82a -6.93
MSP18 O5.5V-III 5.89 0.88 3 6.92 $\pm$ 0.14 7.4 $\pm$ 0.4 6.4 $\pm$ 0.2 7.4 $\pm$ 0.2 0.38 $\pm$ 0.05 0.19 $\pm$ 0.02 35.8a -5.92
MSP32b O9.5V: 4.61: 0.90: 3 0.025 $\pm$ 0.014 0.07 $\pm$ 0.04 0.006 $\pm$ 0.022 0.03 $\pm$ 0.02 $-0.15\pm0.50$ $-0.92\pm1.38$ 0.15 -7.02
MSP44c O9.5V: 4.44: 0.88: 4 0.23 $\pm$ 0.03 0.27 $\pm$ 0.08 0.23 $\pm$ 0.04 0.23 $\pm$ 0.05 1. 0.11 $\pm$ 0.12 0.53 -6.31
MSP120b O9.5V: 4.58: 1.00: 4 0.050 $\pm$ 0.018 0.06 $\pm$ 0.05 0.08 $\pm$ 0.03 0.01 $\pm$ 0.02 $-0.07\pm0.47$ $-0.47\pm0.59$ 0.41 -6.54
MSP151 O7III 5.37 0.95 2 0.14 $\pm$ 0.02 0.12 $\pm$ 0.04 0.17 $\pm$ 0.03 0.13 $\pm$ 0.03 0.16 $\pm$ 0.29 $-0.28\pm0.16$ 0.57 -7.19
MSP157 O5.5V 5.37 0.92 1.5 0.25 $\pm$ 0.02 0.35 $\pm$ 0.05 0.21 $\pm$ 0.04 0.20 $\pm$ 0.04 0.27 $\pm$ 0.20 $-0.10\pm0.10$ 1.16a -6.89
MSP165b O7V: 5.09: 1.08: 4 0.52 $\pm$ 0.04 0.48 $\pm$ 0.06 0.63 $\pm$ 0.09 0.45 $\pm$ 0.08 0.57 $\pm$ 0.16 $-0.49\pm0.09$ 1.98a -6.37
MSP167 O6III 5.14 0.98 2 2.05 $\pm$ 0.07 1.80 $\pm$ 0.12 2.25 $\pm$ 0.11 2.00 $\pm$ 0.13 0.57 $\pm$ 0.07 $0.00\pm0.04$ 8.85a -5.77
MSP168b O8V: 4.90: 0.89: 2 0.079 $\pm$ 0.017 0.05 $\pm$ 0.03 0.08 $\pm$ 0.02 0.11 $\pm$ 0.02 $-0.23\pm0.27$ $-0.42\pm0.25$ 0.41 -6.87
MSP171 O5V 5.58 1.00 4 0.16 $\pm$ 0.03 0.13 $\pm$ 0.03 0.18 $\pm$ 0.04 0.13 $\pm$ 0.09 0.22 $\pm$ 0.27 $-0.93\pm0.35$ 1.09 -7.13
MSP175 O5.5V-III 5.49 0.91 2 0.41 $\pm$ 0.03 0.34 $\pm$ 0.05 0.41 $\pm$ 0.05 0.45 $\pm$ 0.05 0.34 $\pm$ 0.14 $-0.56\pm0.08$ 1.78a -6.82
MSP182 O4V-III 5.45 0.93 4 0.18 $\pm$ 0.03 0.20 $\pm$ 0.04 0.12 $\pm$ 0.04 0.22 $\pm$ 0.06 $-0.24\pm0.16$ $-0.76\pm0.20$ 0.58 -7.27
MSP183 O4V 6.07 1.03 2 0.70 $\pm$ 0.04 0.67 $\pm$ 0.07 0.60 $\pm$ 0.06 0.86 $\pm$ 0.09 0.09$\pm0.10$ $-0.44\pm0.06$ 4.49a -7.00
MSP188 O4V-III 5.93 0.96 2.5 3.43 $\pm$ 0.08 3.65 $\pm$ 0.17 3.41 $\pm$ 0.14 3.28 $\pm$ 0.14 0.23 $\pm$ 0.05 $-0.10\pm0.03$ 14.4a -6.35
MSP199 O3V 5.61 0.97 2 0.11 $\pm$ 0.02 0.10 $\pm$ 0.03 0.10 $\pm$ 0.03 0.12 $\pm$ 0.03 0.50 $\pm$ 0.42 $-0.56\pm0.18$ 0.57 -7.44
MSP203 O6V-III 5.84 0.95 2 0.57 $\pm$ 0.04 0.53 $\pm$ 0.07 0.49 $\pm$ 0.05 0.69 $\pm$ 0.06 0.12 $\pm$ 0.11 $-0.35\pm0.07$ 3.17a -6.92
MSP223c O8.5V: 4.80: 1.00: 2 0.074 $\pm$ 0.015 0.04 $\pm$ 0.03 0.08 $\pm$ 0.02 0.08 $\pm$ 0.02 0.19 $\pm$ 0.41 0.18 $\pm$ 0.21 0.25 -6.98
MSP263 O6.5V 5.45 1.09 4 0.20 $\pm$ 0.02 0.19 $\pm$ 0.04 0.24 $\pm$ 0.04 0.18 $\pm$ 0.03 0.30 $\pm$ 0.18 $-0.47\pm0.13$ 1.17a -6.96
MSP441b O8V: 4.89: 0.90: 1.7 0.084 $\pm$ 0.015 0.09 $\pm$ 0.03 0.07 $\pm$ 0.02 0.10 $\pm$ 0.03 0.25 $\pm$ 0.40 $-0.07\pm0.19$ 0.30 -7.00
Src 1b O6V: 5.31: 0.98: 5 0.071 $\pm$ 0.015 0.07 $\pm$ 0.03 0.10 $\pm$ 0.03 0.05 $\pm$ 0.02 0.15 $\pm$ 0.32 $-0.91\pm0.34$ 0.43 -7.26
Src 2b O8.5III: 5.22: 1.08: 6 0.46 $\pm$ 0.03 0.54 $\pm$ 0.07 0.46 $\pm$ 0.05 0.40 $\pm$ 0.05 0.63 $\pm$ 0.13 $-0.45\pm0.08$ 1.95a -6.52
Src 3b O9.5V: 4.61: 1.10: 4 0.036 $\pm$ 0.010 0.05 $\pm$ 0.02 0.038 $\pm$ 0.017 0.023 $\pm$ 0.015 >0.95 $-0.40\pm0.32$ 0.13 -7.08
Src 4b O9.5I: 5.46: 0.95: 1.5 0.146 $\pm$ 0.018 0.06 $\pm$ 0.03 0.25 $\pm$ 0.04 0.10 $\pm$ 0.03 1.02 $\pm$ 0.21 0.26 $\pm$ 0.12 0.57 -7.28
a From Table 4.
b OB candidate.
v Eclipsing binary.


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