Table 1
Observation summary.
| # | Telescope | Instrument | Start night | UT window | Texp | Nobs | Air mass (a) | S∕N(b) | Program | |
|---|---|---|---|---|---|---|---|---|---|---|
| [s] | Cont. | Core | ||||||||
| 1 | ESO 3.6 m | HARPS | 2011-09-05 | 02:37-08:18 | 900 | 22 | 1.94-1.48-2.33 | 29-37 | 8-11 | 087.C-0649(A) |
| 2 | ESO 3.6 m | HARPS | 2011-09-18 | 01:44-06:54 | 900 | 19 | 1.96-1.48-1.98 | 21-29 | 6-9 | 087.C-0649(A) |
| 3 | TNG | HARPS-N | 2018-09-07 | 21:37-06:00 | 900 | 33 | 1.58-1.02-2.15 | 23-45 | 7-13 | CAT18A_D1 |
| 4 | GTC | OSIRIS | 2012-09-11 | 20:41-00:48 | 22 | 313 | 1.93-1.02-1.02 | – | – | GTC47-12B |
Notes. (a) The first and third values refer to the air mass at the beginning and at the end of the observation. The second value gives the minimum air mass. (b) The two values correspond to the minimum and maximum signal-to-noise ratio (S/N), respectively. The S/N of the continuum was measured at around 5888 Å. The S/N of the Na core was measured at the D2 line.
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