Table 2
Spectral fits of HD 93521.
| Model | log Nwind | k T 1 | Norm1 | k T 2 | Γ2 | Norm2 | Z | f X |
|
 (d.o.f.) |
|
| (cm-2) | (keV) | (keV) | Z ⊙ | (10-14 erg cm-2 s-1) | |||||||
|
|
|||||||||||
| [1] |
|
|
|
|
– |
|
1 (fixed) | 6.20 | 6.52 | 1.49 (65) | |
| [2] |
|
|
|
|
– |
|
|
5.89 | 6.19 | 1.34 (64) | |
| [3] |
|
|
|
|
– |
|
model | 5.57 | 6.02 | 1.32 (63) | |
| [4] |
|
|
|
|
– |
|
model | 5.72 | 6.00 | 1.31 (65) | |
| [5] |
|
|
|
– |
|
|
1 (fixed) | 5.97 | 6.27 | 1.35 (65) | |
| [6] | – |
|
|
– |
|
|
– | 6.15 | 6.41 | 1.46 (66) | |
Notes. All fits were performed with the interstellar neutral hydrogen column density set to 1.3 × 1020 cm-2. Models [1] and [2] correspond to wabs*wind*apec(2T) with solar and free metallicity respectively. Models [3] and [4] correspond to wabs*wind*vapec(2T) with the abundances of He, C, N and O set to 2.14, 0.19, 1.51 and 0.30 times solar. In model [3] , the abundances of Ne and Fe are free (see text), whilst they are fixed at 0.30 solar in model [4] . Models [5] and [6] correspond to wabs*wind*(apec+power) and wabs*(bbody+power) respectively. The fluxes are evaluated over the energy range 0.5–10 keV. The normalization of apec models are defined as 
where d is the distance in cm, ne and nH are the electron and proton densities and V is the volume of the emitting plasma. The normalization parameters of the power law and black-body component are respectively the number of photons keV-1 cm-2 s-1 at 1 keV and the source luminosity in units 1039 erg s-1 divided by the square of the distance in units of 10 kpc.
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