Table 1
Telescopes, instruments, and settings of the spectra used in this work.
| Source | Instrument | Telescope | Resolving power | S/N | λ range (Å) | # O stars |
|---|---|---|---|---|---|---|
| GES | Giraffe-UVES | VLT | 20 000–47 000 | ≥100 | 3900-5500 | 22* |
| OWN | FEROS | MPG/ESO 2.2 m | 48 000 | ≥100 | 3900-5500 | 15 |
| GOSSS | Boller & Chivens | LCO 2.5 mm (du Pont) | 2500 | ≥300 | 3900-5500 | 10 |
| Total number of stars → 47 (of 54 O-stars in the census) | ||||||
| Total number of stars with high-R spectra → 37 (of 54 O-stars in the census) | ||||||
Notes. (*)The star [ARV2008] 217 is not included in this count. GOSSS spectra (and that from [ARV2008] 217 degraded to GOSSS resolution) are used only for discarding fast rotation velocities among the population of O stars in Carina (see Sect. 3.1 for further details).
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