Table 2
List of diagnostic lines used for the determination of the spectroscopic parameters.
| Line | λ (Å) | Line | λ (Å) | Line | λ (Å) |
|---|---|---|---|---|---|
| Hδ | 4101.74 | He I | 4387.93 | He II | 4199.83 |
| Hγ | 4340.46 | He I | 4471.47 | He II | 4541.59 |
| Hβ | 4861.33 | He I | 4713.14 | He II | 5411.52 |
| Hα | 6562.80 | He I | 4921.93 | ||
| He I | 5015.68 | ||||
| He I | 5047.74 | ||||
| He I | 5875.62 | ||||
| Si II | 4128.05 | Si III | 4552.62 | Si IV | 4116.10 |
| Si II | 4130.89 | Si III | 4567.84 | Si IV | 4212.41 |
| Si II | 5056.32 | Si III | 4574.76 | Si IV | 4654.31 |
| Si II | 6371.37 | ||||
Notes. For reference, we found that the He II and Si IV lines disappear below Teff ≈ 25 kK and Teff ≈ 20 kK, respectively. The He I and Si III lines are present in the full Teff range, and the Si II lines appear below Teff ≈ 21 kK. Hδ was removed for fast-rotating stars (see Sect. 3.2.3). Even though the relatively strong Si IV 4088.96 line is also present, we decided to exclude it due to a blend with O II λ4089.29 Å.
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