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Table 2

Parameters of the ΔF275W,F814W pseudo-color–metallicity relationship and metallicity spread derived for the P1 stars.

Cluster N star [M/H]err ΔC RP p-value a b Δ[M/H]
(1) (2) (3) (4) (5) (6) (7) (8)
NGC 104 226 0.008 0.29 0.58 7.96e-22 0.21 ± 0.03 −0.787 ± 0.003 0.061 ± 0.008
NGC 1851 127 0.011 0.21 0.40 4.29e-06 0.25 ± 0.10 −1.169± 0.011 0.053 ± 0.016
NGC 2808 152 0.018 0.33 0.57 3.35e-14 0.41 ± 0.08 −1.072 ± 0.008 0.137 ± 0.021
NGC 3201 30 0.007 0.25 0.69 2.29e-05 0.38 ± 0.15 −1.449± 0.018 0.095 ± 0.029
NGC 362 113 0.017 0.12 0.21 2.54e-02 0.32 ± 0.20 −1.159± 0.009 0.039 ± 0.020
NGC 5286 115 0.023 0.29 0.67 3.27e-16 0.51 ± 0.10 −1.585 ± 0.016 0.148 ± 0.023
NGC 5904 113 0.015 0.20 0.63 7.36e-14 0.41 ± 0.09 −1.296± 0.006 0.083 ± 0.015
NGC 6093 234 0.025 0.20 0.24 2.02e-04 0.15 ± 0.09 −1.647± 0.008 0.030 ± 0.014
NGC 6218 64 0.015 0.13 0.22 7.55e-02 0.17 ± 0.18 −1.319± 0.011 0.022 ± 0.018
NGC 6254 83 0.016 0.23 0.68 1.51e-12 0.48 ± 0.13 −1.497 ± 0.009 0.110 ± 0.023
NGC 6362 33 0.025 0.21 0.38 2.76e-02 0.24 ± 0.17 −1.090± 0.013 0.050 ± 0.028
NGC 6388 97 0.018 0.80 0.81 1.45e-23 0.30 ± 0.04 −0.471 ± 0.012 0.240 ± 0.025
NGC 6441 148 0.018 0.48 0.35 1.34e-05 0.14 ± 0.07 −0.406 ± 0.010 0.067 ± 0.026
NGC 6541 255 0.017 0.13 0.16 1.12e-02 0.11 ± 0.08 −1.727 ± 0.006 0.014 ± 0.009
NGC 6624 68 0.017 0.36 0.48 3.33e-05 0.15 ± 0.09 −0.761 ± 0.013 0.054 ± 0.025
NGC 6656 72 0.014 0.23 0.55 5.14e-07 0.56 ± 0.17 −1.715 ± 0.035 0.132 ± 0.032
NGC 6681 38 0.024 0.17 0.02 8.99e-01 −0.05 ± 0.22 −1.546± 0.014 −0.008 ± 0.028
NGC 6752 92 0.012 0.16 0.72 5.50e-16 0.71 ± 0.11 −1.499 ± 0.006 0.117 ± 0.014
NGC 7078 220 0.033 0.17 0.47 2.86e-13 0.71 ± 0.15 -2.195 ± 0.010 0.122 ± 0.021
NGC 7089 171 0.019 0.24 0.70 1.23e-26 0.66 ± 0.09 −1.484± 0.008 0.156 ± 0.018
NGC 7099 67 0.021 0.10 0.05 6.63e-01 0.22 ± 0.45 -2.172 ± 0.020 0.021 ± 0.034

Notes. (1) Number of stars included in the P1 sample. (2) Median value of the errors on [M/H]. (3) ΔF275W,F814W spread of the P1 stars. (4) Pearson correlation coefficient between ΔF275W,F814W and [M/H] and its (5) p-value. (6) a and (7) b coefficients from the linear relationship derived as in ΔF275W,F814W= a[M/H] + b and their 95% confidence interval as uncertainties. (8) Metallicity spread.

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