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Table 3

General properties of the OB stars in the core of Cyg OB2 as seen with XMM-Newton.

Name Spectral type pn MOS1 MOS2 UVM2 UVW1
CR HR1 HR2 var CR var CR var
Objects studied in previous papers
Cyg OB2 #5 O6.5-7 I + OB-Ofpe/WN9 1.096 0.62  −0.42 SMH 0.404 SMH 0.434 SMH
Cyg OB2 #8a O5.5 I(f) + O6 2.223 0.57  −0.38 MH 0.742 MH 0.752 MH 15.27 12.46
Cyg OB2 #9 O5 If + O6-7 0.479 0.73  −0.19 M 0.159 SMH 0.166 SMH 19.64 15.81
X-ray bright OB stars analysed in this paper
Cyg OB2 #7 O3 If 0.070 0.59  −0.66 S 0.022 0.023 17.39 14.17
Cyg OB2 #12 B5 Ie 0.760 0.84  −0.15 SMH 0.260 SMH 0.259 SMH 20.10
Cyg OB2 #22 O4 III(f) 0.077 0.69  −0.59 0.025 S H 0.024 MH 20.75 16.70
MT91 516 O5.5 V 0.133 0.76  −0.18 MH 0.046 MH 0.045
CPR2002 A11 O7.5 Ibf 0.106 0.78  −0.15 SMH 0.044 MH 0.047 SMH
X-ray fainter OB stars, not analysed in detail
Cyg OB2 #4 O7 IIIf 0.018 0.23  −0.25 0.011 H 0.010
Cyg OB2 #6 O8 V 0.009 0.04  −0.89 0.002 0.002 16.79 13.82
Cyg OB2 #8c O4.5 III(fc) 0.040 0.42  −0.78 S 0.014 0.014 16.58 13.41
Cyg OB2 #15 O8 V 0.009 0.01  −0.63 MH 0.003 S 0.003
Cyg OB2 #16 O7 V 0.009 0.28  −0.79 0.003 0.003 16.72 13.90
Cyg OB2 #17 O8 V 0.005 0.09  −0.57 0.002 0.002 18.18 15.13
Cyg OB2 #24 O7 V 0.009 0.41  −0.59 S 0.002 0.003 19.39 15.97
Cyg OB2 #27 O9.5 V 0.003 0.26  −0.47 H 0.001 0.001 19.82 16.45
MT91 311 B2 V 0.003 0.61 0.28 0.001 0.001 20.94 18.01
MT91 322 B2.5 V 0.002 0.48  −0.13 0.001 H 0.001 18.71
MT91 336 B3 III 0.004 0.73  −0.18 0.001 0.001 20.55 17.75
MT91 376 O8 V 0.005 0.12  −0.59 0.001 0.001 18.44 15.43
MT91 448 O6 V 0.004 0.55  −0.89 0.002 0.001 M 19.04
MT91 455 O8 V 0.006 0.66  −0.66 MH 0.001 H 0.003 MH 20.90 17.45
MT91 485 O8 V 0.007 0.43  −0.65 0.002 0.003 19.25 16.03
MT91 534 O8.5 V 0.009 0.72  −0.38 SMH 0.003 MH 0.003 H
MT91 573 B3 I 0.002 0.51  −0.19 MH 0.001 18.12

Notes. Columns 3, 7, and 9 provide the average count rates (cts s-1) over the 0.5 − 8.0 keV energy band for the pn, MOS1, and MOS2 detectors, respectively. Columns 6, 8, and 10 indicate the energy bands for which the null hypothesis of a constant count rate is rejected at the 5% level for the pn, MOS1, and MOS2 detectors. The hardness ratios (quoted in Cols. 4 and 5 for the pn instrument only) are defined as HR1 = (M − S)/(M + S) and HR2 = (H − M)/(H + M). The X-ray spectra of the first three objects were discussed in previous papers, those of the five following objects are discussed in detail in this paper and the remainder of the objects are too faint for spectral analysis.

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