Table 4.
Spectral features detected in the Si region.
| Line | BB | Ref. wavelength | Det. wavelength | Line flux | Velocity |
|---|---|---|---|---|---|
| α | (Å) | (Å) | (ph s−1 cm−2 × 10−5) | (km s−1) | |
| Si XIV Lyα | 190 | 6.1817 (a) | 6.184 ± 0.001 | 6.2 ± 0.6 (b) | 100 ± 50 |
| Si XIIIr | 190 | 6.6483 | 6.6506 ± 0.0007 |
 |
100 ± 30 |
| Si XIIIi | 190 | 6.7195 | 6.6887 ± 0.0007 (c) |
 |
= v(Si XIII r) |
| Si XIIIf | 190 | 6.7405 | 6.7427 ± 0.0007 (c) | 3.1 ± 0.4 | = v(Si XIII r) |
| Si XII | 1.8 | 6.7197 | 6.722 ± 0.003 | 0.9 ± 0.3 | 110 ± 110 |
| Si XI | 5 | 6.7841 | 6.788 ± 0.004 |
 |
170 ± 180 |
| Si X | 5 | 6.8558 | 6.862 ± 0.004 |
 |
270 ± 180 |
| Si IX | 32 | 6.9279 | 6.930 ± 0.003 | 1.1 ± 0.3 | 80 ± 120 |
| Si VIII | 32 | 7.0008 | 7.006 ± 0.005 | 1.6 ± 0.3 | 220±210 |
| Si VII | 32 | 7.0577 |
 |
0.5 ± 0.2 |
 |
| Si II-VI(d) | 121 | 7.1172 | 7.115 ± 0.001 | 2.6 ± 0.4 | −120 ± 40 |
| Al XIII Lyα | 9 | 7.1764 (e) | 7.177 ± 0.003 | 0.6 ± 0.2 |
 |
Notes. For each of them, we report the detection parameter α and the best-fit values (wavelength and line flux). Line widths were fixed to 0.003 Å if not stated otherwise. Doppler velocities of the Si lines were computed with respect to the reference wavelengths measured by Hell et al. (2016). Hell et al. (2016) report a systematic uncertainty of 0.13 eV for Si lines, corresponding to an error on the wavelength of 0.0005 Å.
Distances between the r line and the i and f lines computed from Drake (1988).
The Mg Lyβ (7.1037 Å, Erickson 1977) might be blended with the Si II-VI line.
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