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Table 3:

Parameters for the two new EPIC spectra of Cyg OB2 No. 8A.

Instr. 		Log $N_{\rm w}$ kT1 Norm1 kT2 Norm2 kT3 Norm3 $\chi^2_\nu$ (d.o.f.) Obs. Flux
    (keV) (10-2) (keV) (10-3) (keV) (10-3)   (erg cm-2 s-1)
Observation 5  
MOS1 $\rm 21.79_{21.68}^{21.87}$ $\rm0.26_{0.23}^{0.30}$ $\rm 3.43_{1.39}^{6.76}$ $\rm0.78_{0.72}^{0.87}$ $\rm 7.81_{6.43}^{9.47}$ $\rm 1.73_{1.60}^{1.90}$ $\rm 6.33_{5.31}^{7.24}$ 1.28 (230) 5.28 $\times$ 10-12
pn $\rm 21.86_{21.80}^{21.91}$ $\rm0.25_{0.23}^{0.29}$ $\rm 6.06_{3.43}^{10.10}$ $\rm0.84_{0.79}^{0.89}$ $\rm 10.96_{9.48}^{12.44}$ $\rm 1.86_{1.71}^{2.06}$ $\rm 4.96_{3.91}^{5.94}$ 0.93 (436) 5.69 $\times$ 10-12
EPIC $\rm 21.81_{21.77}^{21.86}$ $\rm0.27_{0.25}^{0.29}$ $\rm 3.72_{2.48}^{5.78}$ $\rm0.81_{0.77}^{0.86}$ $\rm 8.85_{7.93}^{9.90}$ $\rm 1.77_{1.68}^{1.88}$ $\rm 5.80_{5.09}^{6.44}$ 1.36 (691) 5.49 $\times$ 10-12
Observation 6  
MOS1 $\rm 21.80_{21.72}^{21.84}$ $\rm0.22_{0.20}^{0.24}$ $\rm 8.14_{4.66}^{12.20}$ $\rm0.89_{0.82}^{0.99}$ $\rm 7.02_{5.79}^{8.64}$ $\rm 1.60_{1.51}^{1.75}$ $\rm 7.96_{6.12}^{9.20}$ 1.78 (329) 6.00 $\times$ 10-12
pn $\rm 21.73_{21.68}^{21.77}$ $\rm0.26_{0.24}^{0.28}$ $\rm 3.83_{2.70}^{5.50}$ $\rm0.79_{0.76}^{0.82}$ $\rm 9.70_{8.86}^{1.79}$ $\rm 10.56_{1.67}^{1.79}$ $\rm 7.75_{7.24}^{8.23}$ 1.11 (843) 6.72 $\times$ 10-12
EPIC $\rm 21.70_{21.67}^{21.72}$ $\rm0.26_{0.25}^{0.28}$ $\rm 3.17_{2.53}^{3.84}$ $\rm0.81_{0.78}^{0.84}$ $\rm 7.60_{7.06}^{8.14}$ $\rm 1.68_{1.63}^{1.72}$ $\rm 8.07_{7.66}^{8.45}$ 1.96 (1274) 6.39 $\times$ 10-12

Notes. The parameters are derived from a wabs $_{\rm ISM}$*wind*(mekal1+mekal2+mekal3) model. Results are given for the MOS1, pn, and combined MOS1+pn (``EPIC'') instruments. The first absorption component (wabs $_{\rm ISM}$) is frozen at the ISM value: $0.94~\times~10^{22}$ cm-2. The second absorption column, quoted as $N_{\rm w}$ (in cm-2), stands for the absorption by the ionized wind material. The normalization parameter (Norm) of the mekal components is defined as $(10^{-14}/(4~\pi~D^2))\int{n_{\rm e}~n_{\rm H}~{\rm d}V}$, where D, $n_{\rm e}$ and $n_{\rm H}$ are respectively the distance to the source (in cm), and the electron and hydrogen number densities (in cm-3). The indicated range in the parameter values represents the 90% confidence interval. The last column gives the observed flux between 0.5 and 10.0 keV.


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