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Table 2
Mean cluster metallicities and references for lower-quality studies not discussed in the paper (not in Tables 9 or 10).
| High-resolution, low SNR (<50) studies | ||||||
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| Cluster ID | Mean [Fe/H] | std. dev. | Resolution | # | Star type | Reference |
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| Berkeley 21 | −0.54 | 0.20 | 48 000 | 3 | giant | Hill & Pasquini (1999) |
| Berkeley 22 | −0.32 | 0.19 | 34 000 | 2 | giant | Villanova et al. (2005) |
| Berkeley 25 | −0.20 | 0.05 | 40 000 | 4 | giant | Carraro et al. (2007b) |
| Berkeley 66 | −0.48 | 0.24 | 34 000 | 2 | giant | Villanova et al. (2005) |
| Berkeley 73 | −0.22 | 0.10 | 40 000 | 2 | giant | Carraro et al. (2007b) |
| Berkeley 75 | −0.22 | 0.20 | 40 000 | 1 | giant | Carraro et al. (2007b) |
| NGC 2355 | −0.07 | 0.11 | 42 000 | 15 | giant | Soubiran et al. (2000) |
| Ruprecht 4 | −0.09 | 0.05 | 40 000 | 3 | giant | Carraro et al. (2007b) |
| Ruprecht 7 | −0.26 | 0.05 | 40 000 | 5 | giant | Carraro et al. (2007b) |
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| Medium-resolution, high SNR (>50) studies | ||||||
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| Cluster ID | Mean [Fe/H] | std. dev. | Resolution | # | Star type | Reference |
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| IC 2581 | −0.34 | 18 000 | 1 | giant | Luck (1994) | |
| IC 4725 | 0.17 | 0.09 | 18 000 | 3 | giant | Luck (1994) |
| NGC 2168 | −0.21 | 0.10 | 20 000 | 9 | dwarf | Barrado y Navascués et al. (2001) |
| NGC 2425 | −0.15 | 0.09 | 21 000 | 4 | giant | Jacobson et al. (2011b) |
| NGC 3293 | 0.14 | 0.11 | ~20 000 | 2 | giant+dwarf | Trundle et al. (2007) |
| NGC 4755 | 0.39 | 0.25 | ~20 000 | 1 | dwarf | Trundle et al. (2007) |
| NGC 6067 | 0.01 | 0.12 | 18 000 | 7 | giant | Luck (1994) |
| NGC 6087 | −0.01 | 0.23 | 18 000 | 3 | giant | Luck (1994) |
| NGC 6611 | 0.17 | 0.15 | 20 000 | 1 | dwarf | Trundle et al. (2007) |
| NGC 6882/5 | −0.02 | 0.01 | 18 000 | 2 | giant | Luck (1994) |
| Tombaugh 2 | −0.28 | 0.08 | 21 000 | 7 | giant | Frinchaboy et al. (2008) |
| Tombaugh 2 | −0.31 | 0.02 | ~17 000 | 13 | giant | Villanova et al. (2010) |
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| Medium-resolution, low SNR (<50) studies | ||||||
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| Cluster ID | Mean [Fe/H] | std. dev. | Resolution | # | Star type | Reference |
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| NGC 1883 | −0.20 | 0.22 | 20 000 | 2 | giant | Villanova et al. (2007) |
| NGC 6253 | 0.36 | 0.20 | 15 000 | 2 | giant | Carretta et al. (2000) |
| NGC 6791 | 0.40 | 0.10 | 20 000 | 1 | (a) | Peterson & Green (1998) |
| NGC 6791 | 0.39 | 0.05 | 20 000 | 10 | giant | Carraro et al. (2006) |
Notes. (a) blue-straggler or blue-horizontal-branch star.
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