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Table 1.

Comparison of membership results in Cha I and Cha II using different values for the probability threshold pin.

pin popt Members TPR CR popt Members TPR CR
Cha I (large field) Cha II (large field)
0.5 0.80 189 0.964 ± 0.010 0.040 ± 0.017 0.74 48 0.978 ± 0.018 0.039 ± 0.004
0.6 0.90 183 0.947 ± 0.005 0.024 ± 0.011 0.78 47 0.982 ± 0.013 0.030 ± 0.005
0.7 0.80 189 0.962 ± 0.014 0.052 ± 0.024 0.59 47 0.977 ± 0.006 0.030 ± 0.016
0.8 0.84 184 0.972 ± 0.006 0.037 ± 0.016 0.83 40 0.970 ± 0.023 0.030 ± 0.005
0.9 0.81 187 0.972 ± 0.020 0.034 ± 0.011 0.81 38 0.983 ± 0.010 0.021 ± 0.011
Cha I (central region) Cha II (central region)
0.5 0.80 192 0.995 ± 0.005 0.021 ± 0.013 0.74 43 0.980 ± 0.017 0.022 ± 0.003
0.6 0.84 191 0.996 ± 0.003 0.014 ± 0.008 0.77 41 0.988 ± 0.006 0.012 ± 0.003
0.7 0.69 192 0.998 ± 0.003 0.012 ± 0.003 0.76 41 0.985 ± 0.013 0.008 ± 0.008
0.8 0.86 190 0.993 ± 0.008 0.007 ± 0.012 0.78 41 0.983 ± 0.016 0.008 ± 0.003
0.9 0.90 188 0.991 ± 0.008 0.002 ± 0.003 0.79 41 0.985 ± 0.010 0.017 ± 0.011

Notes. We provide the optimum probability threshold, the number of cluster members, the true positive rate (TPR) and contamination rate (CR) obtained for each solution and cluster. We present the results of our membership analysis performed over a large field that encompasses the entire Chamaeleon complex (see Sect. 2.1) and the central regions around the Cha I and Cha II molecular clouds (see Sect. 2.2).

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