Table 1
Sample of 20 calibrating Cepheids with high-resolution spectra covering either a substantial portion or the entire pulsation cycle.
| Name | αICRS | δICRS | Mode | [Fe/H]lit ± σ | Ref.(a) | NF | NH | NU | NS | Ntot |
|---|---|---|---|---|---|---|---|---|---|---|
| R TrA | 15:19:45.712 | −66:29:45.742 | 0 | −0.01 ± 0.03 | 2 | 1 | 14 | … | … | 15 |
| T Vul | 20:51:28.238 | +28:15:01.817 | 0 | 0.07 ± 0.10 | 1 | … | … | … | 26 | 26 |
| FFAql | 18:58:14.748 | +17:21:39.296 | 1 | 0.10 ± 0.10 | 1 | … | … | … | 27 | 27 |
| S Cru | 12:54:21.997 | −58:25:50.215 | 0 | 0.09 ± 0.04 | 2 | … | … | … | 13 | 13 |
| δ Cep | 22:29:10.265 | +58:24:54.714 | 0 | 0.09 ± 0.10 | 1 | … | … | … | 18 | 18 |
| Y Sgr | 18:21:22.986 | −18:51:36.002 | 0 | 0.00 ± 0.06 | 2 | … | 20 | … | 4 | 24 |
| XX Sgr | 18:24:44.500 | −16:47:49.820 | 0 | 0.06 ± 0.04 | 2 | 4 | … | 5 | 3 | 12 |
| η Aql | 19:52:28.368 | +01:00:20.370 | 0B | 0.24 ± 0.09 | 2 | … | … | … | 11 | 11 |
| S Sge | 19:56:01.261 | +16:38:05.236 | 0B | 0.14 ± 0.10 | 1 | … | … | … | 21 | 21 |
| V 500Sco | 17:48:37.501 | −30:28:33.461 | 0B | −0.07 ± 0.08 | 1 | … | … | 4 | 3 | 7 |
| β Dor | 05:33:37.512 | −62:29:23.323 | 0B | −0.03 ± 0.05 | 2 | 1 | 46 | … | … | 47 |
| ζ Gem | 07:04:06.530 | +20:34:13.074 | 0B | 0.16 ± 0.05 | 2 | … | 47 | … | 81 | 128 |
| VY Sgr | 18:12:04.566 | −20:42:14.465 | 0B | 0.25 ± 0.08 | 2 | 29 | … | 4 | … | 33 |
| UZ Sct | 18:31:22.367 | −12:55:43.339 | 0B | 0.11 ± 0.09 | 2 | 28 | … | 6 | … | 34 |
| Y Oph | 17:52:38.702 | −06:08:36.875 | 0 | 0.08 ± 0.05 | 2 | … | 8 | … | … | 8 |
| RY Sco | 17:50:52.345 | −33:42:20.411 | 0 | 0.01 ± 0.06 | 1 | … | … | 5 | 3 | 8 |
| RZ Vel | 08:37:01.303 | −44:06:52.844 | 0 | 0.08 ± 0.06 | 2 | 1 | 11 | … | … | 12 |
| V340 Ara | 16:45:19.112 | −51:20:33.394 | 0 | 0.23 ± 0.07 | 2 | 26 | … | 6 | … | 32 |
| WZ Sgr | 18:16:59.716 | −19:04:32.989 | 0 | 0.28 ± 0.08 | 1 | 1 | … | 5 | 3 | 9 |
| RS Pup | 08:13:04.216 | −34:34:42.692 | 0 | 0.14 ± 0.07 | 2 | … | 15 | … | 3 | 18 |
Notes. The first four columns give the star name, the right ascension and declination, and the pulsation mode (0: fundamental; 1: first overtone; 0B: fundamental with bump). Columns (5) and (6) give the iron abundance from literature and the corresponding references. Columns (7)–(10) show the number of optical spectra used for each spectrograph: NF: FEROS; NH: HARPS; Nu: UVES; NS: STELLA. The last column lists the total number of spectra per target.
References. (a) 1: Genovali et al. (2014) for T Vul, FF Aql, δ Cep, and S Sge we assumed a typical error of 0.1 dex since they were not provided by the original authors; 2: Proxauf et al. (2018), from which the uncertainty adopted is the largest value between σ and std.
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