Table 4
X-ray spectral fits of the O-type stars in IC 1805.
| Object | Inst. |
|
log Nwind | k T 1 | Norm1 | k T 2 | Norm2 |  (d.o.f.) |
f X |
|
log LX/Lbol |
| (1022 cm-2) | (keV) | (cm-5) | (keV) | (cm-5) | (10-14 erg cm-2 s-1) | ||||||
|
|
|||||||||||
| BD+60° 497 | M2 + pn | 0.48 | – |
|
|
– | – | 0.97(38) |
|
|
−7.03 ± 0.06 |
| BD+60° 498 | M2 + pn | 0.44 | – |
|
|
– | – | 0.83(2) |
|
|
−7.27 ± 0.25 |
| BD+60° 498 | ACIS | 0.44 | – |
|
|
– | – | 0.03(3) |
|
|
−7.41 ± 0.18 |
| BD+60° 499 | M2 + pn | 0.46 | – |
|
|
– | – | 1.78(7) |
|
|
−7.10 ± 0.11 |
| BD+60° 499 | ACIS | 0.46 | – |
|
|
– | – | 0.02(2) |
|
|
−6.96 ± 0.19 |
| BD+60° 501 | EPIC | 0.42 |
|
|
|
|
|
0.93(58) |
|
|
−6.79 ± 0.04 |
| BD+60° 501 | ACIS | 0.42 | – |
|
|
|
|
0.75(22) |
|
|
−6.94 ± 0.06 |
| BD+60° 513 | M2 + pn | 0.45 | – |
|
|
– | – | 0.26(3) |
|
|
−7.56 ± 0.14 |
| HD 15558 | EPIC | 0.44 |
|
|
|
|
|
1.60(238) |
|
|
−6.81 ± 0.01 |
| HD 15558 | ACIS∗ | 0.44 |
|
|
|
|
|
1.49(133) |
|
|
−6.80 ± 0.02 |
| HD 15570 | EPIC | 0.57 |
|
|
|
|
|
1.38(153) |
|
|
−7.24 ± 0.03 |
| HD 15570 | ACIS | 0.57 |
|
|
|
|
|
1.15(96) |
|
|
−7.28 ± 0.05 |
| HD 15629 | EPIC | 0.41 |
|
|
|
|
|
0.97(95) |
|
|
−7.05 ± 0.03 |
| HD 15629 | ACIS | 0.41 |
|
|
|
– | – | 1.22(31) |
|
|
−7.01 ± 0.08 |
|
|
|||||||||||
| Source b | ACIS |
|
– |
|
|
– | – | 1.02(9) |
|
|
|
Notes. The ACIS-I spectrum of HD 15558 is affected by moderate pile-up. Source b is CXO 023216.25 +613312.0, i.e. a secondary source detected with Chandra at 4.̋6 from the position of BD+60° 499. The normalization of the apec models corresponds to 
where d is the distance of the source (in cm), ne and nH are the electron and hydrogen densities of the source (in cm-3). The fluxes fX and correspond to the observed and ISM-absorption corrected fluxes in the 0.5−10.0 keV energy band.
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