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Table 4.

Metallicities of programme clusters using the D16, S12, and V15 calibrations, compared with [Fe/H] from the literature.

Cluster N 〈W′〉 [Fe/H]CaT D16 cal. [Fe/H]CaT S12 cal. [Fe/H]CaT V15 cal. [Fe/H]D16 [Fe/H]H10 w [Fe/H]C09 ρ
BH 176 11 6.44 ± 0.43 … … −0.12 ± 0.22 −0.08 ± 0.04 0.00 1 … 0.7
Djorg 1 3 3.86 ± 0.26 −1.36 ± 0.14 −1.48 ± 0.15 −1.39 ± 0.21 −1.54 ± 0.13a −1.51 1 … 1.5
Djorg 2 3 4.52 ± 0.07 −0.97 ± 0.13 −1.09 ± 0.15 −1.07 ± 0.21 −0.79 ± 0.09 −0.65 1 … 0.4
NGC 5634 10 2.93 ± 0.28 −1.83 ± 0.12 −1.89 ± 0.13 −1.83 ± 0.20 −1.75 ± 0.06 −1.88 2 −1.93 ± 0.09 1.3
NGC 5694 9 2.32 ±0.15 −2.08 ±0.11 −2.11 ± 0.13 −2.12 ± 0.20 −1.98 ± 0.06 −1.98 5 −2.02 ± 0.07 1.0
NGC 5946 10 3.67 ± 0.22 −1.46 ± 0.13 −1.57 ± 0.14 −1.48 ± 0.21 −1.54 ± 0.07 −1.29 4 −1.29 ± 0.14 0.9
NGC 6256 10 3.58 ± 0.44 −1.51 ± 0.14 −1.61 ± 0.14 −1.53 ± 0.21 −1.05 ± 0.13a −1.02 2 −0.62 ± 0.09 2.2
NGC 6284 7 4.31 ± 0.16 −1.10 ± 0.12 −1.22 ± 0.14 −1.18 ± 0.20 −1.07 ± 0.06 −1.26 2 −1.31 ± 0.09 0.7
NGC 6316 3 5.43 ± 0.06 −0.35 ± 0.14 −0.37 ± 0.17 −0.63 ± 0.21 −0.50 ± 0.06 −0.45 5 −0.36 ± 0.14 0.1
NGC 6352 12 5.22 ±0.18 −0.50 ± 0.12 −0.56 ± 0.14 −0.73 ± 0.20 −0.54 ± 0.04 −0.64 5 −0.62 ± 0.05 0.7
NGC 6355 7 3.62 ± 0.32 −1.49 ± 0.14 −1.59 ± 0.15 −1.51 ± 0.21 −1.46 ± 0.06 −1.37 4 −1.33 ± 0.14 1.6
NGC 6366 14 4.91 ± 0.22 −0.72 ± 0.12 −0.81 ± 0.14 −0.88 ± 0.20 −0.61 ± 0.05 −0.59 3 −0.59 ± 0.08 1.3
NGC 6401 7 4.18 ± 0.25 −1.18 ± 0.14 −1.30 ± 0.15 −1.24 ± 0.21 −1.12 ± 0.07 −1.02 5 −1.01 ± 0.14 1.3
NGC 6426 7 1.58 ± 0.09 −2.34 ±0.11 −2.38 ± 0.13 −2.45 ± 0.20 −2.39 ± 0.04 −2.15 3 … 0.8
NGC 6453 6 3.46 ± 0.17 −1.57 ± 0.12 −1.67 ± 0.13 −1.58 ± 0.20 −1.54 ± 0.09 −1.50 4 −1.48 ± 0.14 1.0
NGC 6517 9 3.54 ± 0.18 −1.53 ± 0.12 −1.63 ± 0.13 −1.55 ± 0.20 −1.26 ± 0.13a −1.23 4 −1.24 ± 0.14 1.1
NGC 6539 9 5.09 ± 0.19 −0.59 ± 0.12 −0.67 ± 0.14 −0.80 ± 0.20 −0.55 ± 0.06 −0.63 5 −0.53 ± 0.14 0.8
NGC 6749 8 3.52 ± 0.09 −1.54 ± 0.11 −1.64 ± 0.13 −1.56 ± 0.20 −1.59 ± 0.09 −1.60 1 −1.62 ± 0.09 0.3
NGC 6864 11 4.44 ± 0.23 −1.02 ± 0.12 −1.14 ± 0.14 −1.11 ± 0.20 −1.00 ± 0.05 −1.29 3 −1.29 ± 0.14 1.3
Pal 10 9 5.54 ± 0.31 −0.27 ± 0.16 −0.27 ± 0.19 −0.57 ± 0.21 −0.24 ± 0.03 −0.10 1 … 1.0
Pal 11 7 5.34 ± 0.18 −0.42 ± 0.13 −0.45 ± 0.15 −0.67 ± 0.20 −0.35 ± 0.05 −0.40 4 −0.45 ± 0.08 0.7
Pal 14 5 3.99 ± 0.25 −1.29 ± 0.13 −1.41 ± 0.14 −1.33 ± 0.21 −1.22 ± 0.09 −1.62 4 −1.63 ± 0.08 0.7
Pal 6 3 5.10 ± 0.07 −0.59 ± 0.14 −0.66 ± 0.16 −0.79 ± 0.21 −0.85 ±0.11 −0.91 3 −1.06 ± 0.09 0.2
Terzan 1 9 4.88 ± 0.10 −0.74 ±0.18 −0.84 ± 0.21 −0.90 ± 0.23 −1.06 ± 0.13a −1.03 3 −1.29 ± 0.09 0.3
Terzan 2 3 5.33 ± 0.21 −0.42 ±0.18 −0.46 ± 0.22 −0.68 ± 0.22 −0.72 ± 0.13a −0.69 3 −0.29 ± 0.09 0.6
Terzan 8 7 2.21 ± 0.08 −2.12 ±0.11 −2.15 ± 0.13 −2.17 ± 0.20 −2.06 ± 0.04 −2.16 2 … 0.8
Terzan 9 6 4.34 ± 0.19 −1.08 ± 0.14 −1.21 ± 0.15 −1.16 ± 0.21 −1.08 ± 0.13a −1.05 2 −2.07 ± 0.09 0.7
Ton 2 8 5.55 ± 0.26 −0.26 ± 0.15 −0.26 ± 0.19 −0.57 ± 0.21 −0.73 ± 0.13a −0.70 1 … 0.8

Notes. Columns: (1) Cluster ID. (2) Number of cluster member stars analysed. (3) Average reduced EW of clusters in our sample on the measurement scale of Saviane et al. (2012), as discussed in Sect. 4.1. (4) Metallicity calibrated on the D16 scale using Eq. (5), and total uncertainty. (5,6) The same for the S12 and V15 scales, using Eqs. (2) and (3). (7) Average metallicity from Dias et al. (2016a) if present, or the homogeneous compilation by Dias et al. (2016b) on the metallicity scale of Dias et al. (2016a). (8,9) Metallicity and weight from the Harris catalogue. (10) Average metallicity from literature compiled by Carretta et al. (2009). (11) Ratio of the rms dispersion around the linear fit with fixed slope, to the mean measurement error.

(a)

Metallicities from Dias et al. (2016b).

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