Table 1
Details of the ground-based, spectroscopic observations.
| Instrument | Telescope | N | R | Δλ (Å) | S/N | Date of observation |
| (HJD – 2 450 000) | ||||||
|
|
||||||
| FEROS | ESO, La Silla (2.2 m) | 1 | 48 000 | 3750–8530 | 220 | 2655.57 |
| HERMES | Mercator (1.2 m) | 39 | 85 000 | 3770–9000 | 115–220 | 5218.45–5889.63 |
| Coudé | Thüringer Landessternwarte (TLS) Tautenburg (2.0 m) | 40 | 63 000 | 4720–7360 | 65–195 | 5840.64–5939.38 |
| Echelle | Poznań Spectroscopic Telescope (PST) | 21 | 35 000 | 4300–7510 | 10–45 | 5847.60–5895.60 |
| UVES | ESO, Paranal (VLT) | 16 | 80 000a | 3290–4520 | 215–360 | 5855.85–5950.55 |
| 16 | 110 000a | 5690–7520 | ... | 5855.85–5950.55 | ||
| 16 | 95 000a | 7660–9460 | ... | 5855.85–5950.55 | ||
| HARPS | La Silla (3.6 m) | 77 | 80 000 | 3780–6910 | 175–355 | 5913.61–5937.84 |
| GIRAFFEb | South African Astronomical Observatory, SAAO (1.9 m) | 8 | 39 000 | 3840–5850 | 30–120 | 5925.38–5930.51 |
| SARG | TNG (3.6 m) | 65 | 46 000 | 3640–4310 | ... | 5967.34–5980.57 |
| 65 | 46 000 | 4360–5140 | 155–270 | 5967.34–5980.57 | ||
Notes. N is the total number of spectra collected, R is the mean resolving power, and Δλ is the wavelength coverage. As discussed in Sect. 3.3, the S/N has been determined in a homogeneous way and is based on the 1σ dispersion measured in continuum regions at ~4500 Å (~4965 Å for the TLS spectra). The HERMES and HARPS observations were carried out in the HRF and EGGS modes, respectively. ;
Estimated based on figures quoted in UVES User’s manual between the resolving power and the slit width (here 0.4 and 0.3′′for the blue and red arms, respectively)
the Grating Instrument for Radiation Analysis with a Fibre Fed Échelle (GIRAFFE) instrument is a replica of the MUSICOS spectrograph developed at the Observatoire de Paris, Meudon, France (Baudrand & Böhm 1992).
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