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Table 5
Rest wavelengths used for the radial-velocity estimates.
| Ion | λ | ΔNight1 | ΔNight2 |
| [Å] | [km s-1] | [km s-1] | |
|
|
|||
| O-type ( ≤ O4) stars: | |||
| He II | 4025.60 | 2.0 ± 10.8 | −1.5 ± 9.3 |
| He II | 4199.83 | −1.0 ± 6.6 | 3.2 ± 6.7 |
| He II | 4541.59 | −1.0 ± 12.2 | −1.7 ± 4.7 |
|
|
|||
| O-type ( > O4) stars: | |||
| He II | 4199.83 | −1.7 ± 12.4 | −1.9 ± 9.0 |
| He I | 4387.93 | 0.4 ± 9.8 | 0.0 ± 8.4 |
| He II | 4541.59 | 1.8 ± 10.4 | −0.2 ± 7.9 |
| He II | 4685.71 | 2.2 ± 10.7 | 2.0 ± 10.0 |
| He I | 4713.15 | −1.6 ± 9.3 | ... |
| He I | 4921.93 | −1.2 ± 7.4 | ... |
|
|
|||
| B-type stars (excl. B9): | |||
| He I | 4009.26 | 0.8 ± 8.8 | 1.8 ± 9.8 |
| He I | 4143.76 | 1.0 ± 7.1 | 1.1 ± 5.7 |
| He I | 4387.93 | −2.1 ± 5.4 | −2.6 ± 4.9 |
| He I | 4437.55 | −0.1 ± 8.6 | 0.5 ± 9.2 |
| Si III | 4552.62 | −1.2 ± 6.1 | −1.1 ± 5.5 |
| Si III | 4567.84 | −0.7 ± 5.2 | 2.1 ± 7.7 |
| Si III | 4574.76 | −0.9 ± 7.3 | −1.8 ± 7.0 |
| He I | 4713.15 | 2.4 ± 5.4 | ... |
| He I | 4921.93 | 0.7 ± 6.3 | ... |
|
|
|||
| B9/A-type stars: | |||
| H | 4101.73 | −3.6 ± 5.2 | −2.4 ± 1.8 |
| Si II | 4128.07 | 3.8 ± 11.0 | 4.5 ± 9.0 |
| Si II | 4130.89 | −0.3 ± 3.2 | 0.9 ± 10.9 |
| H | 4340.47 | −3.7 ± 3.3 | −4.2 ± 7.6 |
| He I | 4471.48 | 2.3 ± 10.2 | 0.3 ± 5.0 |
Notes. Values in the two final columns are the mean differences (Δ) between the velocity estimates from each line and the final velocity for each star. Wavelengths are from the NIST atomic spectra database (Kramida et al. 2012).
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