Table 1.
Information on mean [Na/H], dispersion and IQR([Na/H]) for GES OCs and 47 Tuc.
| Ord | Cluster | Age | Num | mean | sigma | median | median | IQR |
|---|---|---|---|---|---|---|---|---|
| (Gyr) | [Na/H] | [Na/H] | [Fe/H] | [Na/H] | ||||
| 1 | NGC 6253 | 3.24 | 68 | 0.478 | 0.099 | 0.38 | 0.36 | 0.13 |
| 2 | M 67 | 4.27 | 38 | 0.040 | 0.054 | 0.05 | −0.02 | 0.10 |
| 3 | NGC 3532 | 0.40 | 36 | 0.000 | 0.078 | −0.02 | −0.01 | 0.12 |
| 4 | Trumpler 5 | 4.27 | 26 | −0.245 | 0.038 | −0.23 | −0.35 | 0.06 |
| 5 | NGC 2141 | 1.86 | 23 | 0.004 | 0.064 | 0.01 | −0.05 | 0.09 |
| 6 | Ruprecht 134 | 1.66 | 20 | 0.399 | 0.045 | 0.41 | 0.27 | 0.09 |
| 7 | Trumpler 20 | 1.86 | 26 | 0.184 | 0.041 | 0.17 | 0.13 | 0.08 |
| 8 | NGC 2243 | 4.37 | 18 | −0.279 | 0.041 | −0.28 | −0.47 | 0.06 |
| 9 | Berkeley 32 | 4.90 | 17 | −0.141 | 0.085 | −0.16 | −0.29 | 0.12 |
| 10 | NGC 2516 | 0.24 | 15 | −0.039 | 0.051 | −0.05 | −0.05 | 0.08 |
| 11 | NGC 2158 | 1.55 | 14 | −0.076 | 0.038 | −0.05 | −0.16 | 0.09 |
| 12 | NGC 2425 | 2.40 | 14 | −0.059 | 0.066 | −0.07 | −0.14 | 0.12 |
| 13 | NGC 6067 | 0.13 | 13 | 0.216 | 0.141 | 0.23 | −0.03 | 0.15 |
| 14 | Berkeley 21 | 2.14 | 13 | −0.204 | 0.068 | −0.20 | −0.21 | 0.06 |
| 15 | NGC 6005 | 1.26 | 13 | 0.343 | 0.018 | 0.31 | 0.22 | 0.08 |
| 16 | Berkeley 81 | 1.15 | 13 | 0.348 | 0.057 | 0.36 | 0.25 | 0.14 |
| 17 | NGC 6259 | 0.34 | 12 | 0.379 | 0.045 | 0.38 | 0.17 | 0.10 |
| 18 | Haffner 10 | 3.80 | 12 | −0.079 | 0.047 | −0.07 | −0.12 | 0.10 |
| 19 | NGC 2477 | 1.12 | 11 | 0.156 | 0.072 | 0.21 | 0.13 | 0.15 |
| 20 | Trumpler 23 | 0.71 | 11 | 0.346 | 0.079 | 0.37 | 0.21 | 0.04 |
| 21 | Blanco 1 | 0.10 | 11 | −0.083 | 0.065 | −0.07 | −0.05 | 0.09 |
| 22 | NGC 2420 | 1.74 | 37 | −0.098 | 0.088 | −0.08 | −0.16 | 0.11 |
| 23 | NGC 6705 | 0.31 | 10 | 0.282 | 0.023 | 0.28 | 0.06 | 0.04 |
| 24 | NGC 6802 | 0.66 | 10 | 0.269 | 0.029 | 0.27 | 0.15 | 0.06 |
| 25 | 47 Tuc (GC) | 66 | −0.44 | 0.20 | −0.43 | −0.75 | 0.30 |
Notes. ‘Ord’ is the index used in Fig. 3 on the x-axis to indicate the cluster; ‘Num’ indicates how many stars were used to compute the mean, dispersion, and median [Na/H]; the last column shows IQR([Na/H]), that is the difference between the 3rd and 1st quartiles of the [Na/H] distribution.
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