Table 3
Best fit parameters of the X-ray spectra of HDE 228766.
Obs | φ | Model | log Nwind,1 | τ wind,1 | 104 × norm1 | log Nwind,2 | τ wind,2 | 104 × norm2 |
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f X |
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|
|
||||||||||||
(cm-2) | (cm-5) | (cm-2) | (cm-5) | 10-13 erg cm-2 s-1 | ||||||||
|
||||||||||||
I | 0.75 | 2 | 21.65+ .68 | 0.11 |
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![]() |
1.38 |
![]() |
1.75(115) |
![]() |
13.4 | |
I | 0.75 | 3 | 21.23+ .53 | 0.13 |
![]() |
![]() |
1.41 |
![]() |
1.75(115) |
![]() |
13.8 | |
II | 0.50 | 1 |
![]() |
0.50 |
![]() |
![]() |
0.96 |
![]() |
1.40(119) |
![]() |
17.5 | |
III | 0.00 | 2 | 22.53+ .23 | 0.85 |
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![]() |
2.09 |
![]() |
1.29(91) |
![]() |
4.7 | |
III | 0.00 | 3 |
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0.91 |
![]() |
![]() |
2.69 |
![]() |
1.26(91) |
![]() |
5.3 | |
Notes. All fits were performed with an xspec model of the kind phabs*(wind1*apec1 + wind2*apec2), where phabs accounts for the absorption by the interstellar medium with a fixed neutral hydrogen column density of 5.2 × 1021 cm-2 and where the apec emission components have fixed temperatures of 0.33 keV (component 1) and 0.93 keV (component 2) and solar composition. The additional absorptions by the stellar winds are evaluated using the opacities of the model identified in Col. 3 (see also Table 2). The wind column densities of the soft plasma component sometimes have large uncertainties and in a few cases, the lower boundary of the uncertainty range could not be defined. The normalization parameter of the apec components is defined as , where d is the distance of the star and ne and nH are the electron and hydrogen number densities of the emitting plasma. The observed fluxes in the 0.5−10 keV energy band and the corresponding fluxes corrected for the ISM absorption are given in the last two columns. The errors on the observed fluxes were obtained via the flux err command under xspec.
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