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Table 2
Calibration clusters.
| Cluster | [Fe/H]Lit | [Fe/H] | σ[Fe/H] | N | Reference |
| dex | dex | dex | |||
|
|
|||||
| NGC 6791 | +0.37 | +0.35 | 0.15 | 23 | (1) |
| NGC 6819 | +0.16 | +0.11 | 0.10 | 28 | (2) |
| NGC 7789 | +0.09 | +0.03 | 0.05 | 5 | (3) |
| M67 | +0.06 | +0.04 | 0.08 | 23 | (3) |
| NGC 188 | +0.04 | +0.11 | 0.14 | 5 | (3) |
| NGC 2420 | –0.13 | –0.14 | 0.05 | 9 | (3) |
| NGC 2158 | –0.24 | –0.19 | 0.05 | 10 | (3) |
| M107 | –1.03 | –1.01 | 0.07 | 16 | (4) |
Notes. The literature mean metallicity, [Fe/H]Lit, are sourced from the following: (1) Carraro et al. (2006); (2) Bragaglia et al. (2001); (3) Jacobson et al. (2011); and (4) 2010 version of Harris (1996). The [Fe/H] and σ[Fe/H] are the mean and star-to-star dispersion of each cluster, respectively.
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