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Table 1
Absorption lines used to estimate relative RVs for the B-type spectra.
| Ion | λ (Å) | Type |
|
|
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| O ii | 4080 | Group |
| He i | 4009 | Singlet |
| He i | 4026 | Triplet |
| He i | 4121 | Triplet |
| He i | 4144 | Singlet |
| He i | 4169 | Singlet |
| O ii | 4317 | Doublet |
| He i | 4388 | Singlet |
| O ii | 4414 | Doublet |
| He i | 4438 | Singlet |
| He i | 4471 | Triplet |
| Si iii | 4553 | Singlet |
Notes. The O ii λ4080 group comprises a number of lines extending over the 4069−4095 Å region.
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