Table 1.
Telescopes, instruments, and settings used in this work.
| Source | Telescope | Instrument | Grating | Resolving power | λ range [Å] | Date | # Stars |
|---|---|---|---|---|---|---|---|
| 1 | 2.56 m NOT – ORM | ALFOSC | #17 | 5000 | 6330 − 6870 | October 2024 | 31 |
| 2 | 10.4 m GTC – ORM | OSIRIS+ | R2000B | 2165 | 3950 − 5700 | September 2024 | 34 |
| 3a | 10.4 m GTC – ORM | OSIRIS | R2500U | 2555 | 3440 − 4610 | GOSSS survey | 11 |
| 3b | 10.4 m GTC – ORM | OSIRIS | R2500V | 2515 | 4500 − 6000 | GOSSS survey | 11 |
| 3c | 3.5 m – CAHA | TWIN | 1200 | 3000 | 3900 − 5100 | GOSSS survey | 15 |
| 4a | 4.2 m WHT – ORM | ISIS | H2400B | 13600 | 3900 − 5100 | Berlanas et al. (2018a) | 1 |
| 4b | 4.2 m WHT – ORM | ISIS | R1200B | 7500 | 3900 − 5100 | Berlanas et al. (2018a) | 2 |
| 4c | 4.2 m WHT – ORM | WYFFOS | H2400B | 5000 | 3800 − 5200 | Berlanas et al. (2018a) | 5 |
| 5 | 2.54 m INT – ORM | IDS | R1200B | 4600 | 3900 − 5100 | Berlanas et al. (2020) | 4 |
| 6 | 2.54 m INT – ORM | IDS | R1200B | 4600 | 3900 − 5100 | October 2023 | 3 |
| Total number of spectra → 120 | |||||||
| Total number of stars observed → 32 | |||||||
Notes. Spectral data from sources 3a, 3b, and 3c are part of the GOSSS catalog; for further details on the observations, see Sota et al. (2011, 2014) and Maíz Apellániz et al. (2016). Some of the stars in our sample have multiple spectra available, obtained during our observing campaign and/or from the existing literature.
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