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Table A.1

The stellar population of the Arches cluster.

ID RA Dec mF127M mF139M mF153M mF205W #Observations Spec. Notes
(h m s) (d m s) (mag) (mag) (mag) (mag) (#Epochs) class.
B1 17 45 51.50 –28 49 26.8 5(5) WN8-9h
B4 17 45 50.86 –28 49 19.7 15(10) O5.5-6 Ia
F1 17 45 50.260 –28 49 22.76 15.45 14.21 12.97 10.45 10(9) WN8-9h Radio1
F2 17 45 49.746 –28 49 26.29 16.73 15.29 13.94 11.18 15(14) WN8-9h SB2, Radio, X-ray
O5-6 Ia+
F3 17 45 50.884 –28 49 26.89 15.05 13.94 12.81 10.46 5(5) WN8-9h Radio
F4 17 45 50.628 –28 49 18.10 14.57 13.56 12.56 10.37 26(10) WN7-8h Radio
F5 17 45 50.510 –28 49 32.40 15.68 14.50 13.32 10.86 5(5) WN8-9h Radio1
F6 17 45 50.478 –28 49 22.79 14.60 13.49 12.39 10.37 13(5) WN8-9h Radio1, X-ray
F7 17 45 50.529 –28 49 20.03 14.71 13.63 12.58 10.48 26(10) WN8-9h X-ray
F8 17 45 50.447 –28 49 21.75 15.12 14.03 12.91 10.76 8(5) WN8-9h Radio
F9 17 45 50.321 –28 49 12.26 14.91 13.85 12.82 10.77 10(10) WN8-9h X-ray
F10 17 45 50.121 –28 49 27.01 16.21 14.93 13.74 11.46 5(5) O7-8 Ia+
F12 17 45 50.337 –28 49 17.78 15.35 14.26 13.21 10.99 13(10)b WN7-8h
F13 17 45 50.102 –28 49 24.15 16.52 15.28 14.08 11.74 5(5) O7-8 Ia+
F14 17 45 50.735 –28 49 23.08 15.43 14.34 13.31 11.72 12(5) WN8-9h
F15 17 45 50.811 –28 49 17.09 15.07 14.05 13.07 11.27 20(11) O6-7 Ia+
F16 17 45 50.581 –28 49 21.17 15.55 14.48 13.42 11.40 11(5) WN8-9h
F17 17 45 50.192 –28 49 27.66 17.03 15.73 14.47 12.15 5(5) O5-6 Ia+
F18 17 45 50.532 –28 49 18.42 15.63 14.59 13.61 11.63 23(10) O4-5 Ia+ Radio
F19 17 45 49.818 –28 49 26.48 17.92 16.53 15.18 12.60 14(13) O4-5 Ia Radio
F20 17 45 50.481 –28 49 20.18 16.53 15.41 14.38 12.16 20(10) O4-5 Ia
F21 17 45 50.820 –28 49 20.11 15.72 14.67 13.68 11.77 22(10) O6-6.5 Ia
F22 17 45 50.278 –28 49 17.21 16.42 15.26 14.16 12.02 9(9)a O5.5-6 Ia
F23 17 45 51.211 –28 49 23.84 16.38 15.27 14.21 12.19 1(1) O6-6.5 Ia
F24 17 45 50.152 –28 49 21.21 17.29 16.06 14.88 12.61 6(6)c O4-5 Ia
F25 17 45 50.012 –28 49 27.06 18.35 16.93 15.57 13.05 9(9)b O4-5 Ia
F26 17 45 50.610 –28 49 24.03 16.61 15.46 14.37 12.34 8(5) O4-5 Ia
F27 17 45 50.664 –28 49 20.02 16.09 15.01 13.97 12.01 29(10) O4-5 Ia+
F28 17 45 50.699 –28 49 22.21 16.17 15.07 14.06 12.17 13(5) O4-5 Ia
F29 17 45 50.799 –28 49 18.14 16.14 15.10 14.10 12.26 22(11) O5.5-6 Ia
F30 17 45 50.275 –28 49 19.10 16.75 15.63 14.56 12.53 10(8)c O4-5 Ia
F31 17 45 50.478 –28 49 20.16 12.41
F32 17 45 50.681 –28 49 20.35 16.46 15.41 14.37 12.42 13(5) O4-5 Ia
F33 17 45 50.723 –28 49 20.40 16.38 15.32 14.32 12.42 13(5) O4-5 Ia
F34 17 45 50.863 –28 49 21.54 16.54 15.48 14.44 12.49 6(5)b O4-5 Ia
F35 17 45 50.755 –28 49 17.50 16.17 15.15 14.18 12.37 20(11) O4-5 Ia
F36 17 45 49.789 –28 49 07.89 18.03 16.58 15.13 12.60
F37 17 45 50.529 –28 49 19.77 12.63 Radio1
F38 17 45 50.755 –28 49 20.48 16.33 15.36 14.22 12.38 11(5) O4-5 Ia
F39 17 45 51.166 –28 49 36.70 16.98 15.84 14.76 12.65
F40 17 45 50.685 –28 49 18.83 16.63 15.57 14.55 12.67 27(11) O4-5 Ia+
F41 17 45 50.429 –28 49 27.42 18.46 17.15 15.89 13.53
F42 17 45 50.364 –28 49 21.24 16.99 15.89 14.85 12.82 10(8) O4-5 Ia
F43 17 45 50.546 –28 49 19.17 17.28 16.21 15.19 13.04 25(11) O4-5 Ia
F44 17 45 50.701 –28 49 25.59 17.19 16.05 14.93 12.88 5(3) Blend
F45 17 45 50.497 –28 49 24.25 17.33 16.16 15.07 13.01 10(5) O4-5 Ia
F47 17 45 50.754 –28 49 25.28 17.02 15.92 14.87 12.90 8(6) O4-5 Ia
F48 17 45 50.623 –28 49 26.96 17.69 16.53 15.42 13.28
F49 17 45 50.128 –28 49 07.79 17.42 16.25 15.12 12.94 3(3) O5.5-6 Ia
F50 17 45 50.134 –28 49 26.17 18.30 17.00 15.77 13.53 6(5) O4-5 Ia
F52 17 45 51.206 –28 49 33.31 17.64 16.41 15.24 12.94
F53 17 45 50.714 –28 49 25.01 17.11 15.97 14.93 12.94 5(3) O4-5 Ia
F54 17 45 50.271 –28 49 15.81 17.93 16.63 15.42 13.02 6(6) O5.5-6 I-III
F55 17 45 50.787 –28 49 22.61 17.11 16.02 15.00 13.03 6(5) O5.5-6 III
F56 17 45 50.591 –28 49 22.19 17.00 15.92 14.91 13.03
F57 17 45 50.768 –28 49 20.31 16.91 13.04
F58 17 45 49.968 –28 49 19.60 17.83 16.57 15.37 13.05
F59 17 45 51.138 –28 49 14.34 17.05 15.98 14.95 13.05
F60 17 45 50.799 –28 49 22.18 17.21 16.08 15.05 13.02 6(5) O4-5 Ia
F61 17 45 50.144 –28 48 59.09 17.38 16.24 15.06 13.09
F62 17 45 50.427 –28 49 16.61 17.04 15.99 15.00 13.04 17(14) O4-5 I-III
F63 17 45 50.838 –28 49 25.68 17.20 16.15 15.14 13.15 7(6) O4-5 I-III
F64 17 45 50.481 –28 49 16.71 17.15 16.10 15.08 13.13 14(10) O4-5 I-III
F65 17 45 50.082 –28 49 21.53 17.58 16.42 15.32 13.16 1(1) O4-5 I-III Low S/N
F66 17 45 50.532 –28 49 20.42 17.07 15.99 15.00 13.11
F67 17 45 50.475 –28 49 15.10 17.69 16.56 15.48 13.35
F68 17 45 50.855 –28 49 18.15 16.70 15.68 14.71 12.93 14(11) O5.5-6 III
F69 17 45 50.847 –28 49 20.32 17.06 15.99 14.97 13.06 4(4) O6-6.5 III
F70 17 45 50.252 –28 49 23.39 17.82 16.59 15.42 13.30
F71 17 45 50.060 –28 49 16.43 18.14 16.92 15.77 13.62
F72 17 45 50.784 –28 49 20.27 16.08 15.05 13.13
F73 17 45 50.679 –28 49 25.58 17.78 16.59 15.48 13.35 5(3) Blend
F74 17 45 50.993 –28 49 27.49 17.62 16.50 15.42 13.36 5(5) O5-6.5 I-III
F75 17 45 50.825 –28 49 11.25 18.91 17.48 16.05 13.36
F76 17 45 50.341 –28 49 17.06 17.64 16.49 15.38 13.38
F77 17 45 50.771 –28 49 19.83 17.30 16.26 15.23 13.25 25(10) O6-6.5 III
F78 17 45 51.939 –28 49 24.71 17.94 16.77 15.59 13.44
F79 17 45 50.074 –28 49 18.11 19.20 17.72 16.23 13.46
F80 17 45 50.589 –28 49 19.46 17.40 16.29 15.32 13.47 24(10) Blend
F81 17 45 50.713 –28 49 24.24 17.62 16.51 15.46 13.48 10(5) O6-7 III-V
F82 17 45 50.736 –28 49 19.13 17.37 16.30 15.31 13.40 29(10) O5-6 III-V
F83 17 45 50.061 –28 49 20.67 18.00 16.81 15.69 13.53
F84 17 45 50.526 –28 49 16.28 17.58 16.49 15.61 13.54 18(10) O6-7 III-V
F85 17 45 50.484 –28 49 18.60 17.50 16.47 15.46 13.54 17(10) O7-8 III-V
F86 17 45 50.985 –28 49 33.59 17.30 16.32 15.35 13.56
F87 17 45 50.518 –28 49 16.58 17.62 16.58 15.56 13.60 19(10) O5-6 V
F88 17 45 49.653 –28 49 17.23 19.10 17.66 16.22 13.62
F89 17 45 50.955 –28 49 17.15 17.33 16.33 15.39 13.65 11(10) O6-7 V
F90 17 45 50.570 –28 49 32.97 18.30 17.09 15.94 13.68 5(5) O5-6 V Brγ infilled
F91 17 45 49.978 –28 49 17.52 18.43 17.19 16.03 13.69
F92 17 45 50.518 –28 49 21.45 17.59 16.50 15.44 13.48 12(5) O5-6 V Brγ infilled
F93 17 45 50.376 –28 49 22.78 18.14 17.04 15.99 13.81 10(8) O5-6 III-V Brγ infilled
F94 17 45 50.657 –28 49 28.03 18.74 17.50 16.33 14.14
F95 17 45 50.578 –28 49 22.00 17.80 16.71 15.69 13.71
F96 17 45 50.724 –28 49 19.73 17.36 16.35 15.37 13.54 29(10) O5-6 III
F97 17 45 51.385 –28 49 16.57 17.83 16.72 15.67 13.73
F98 17 45 51.153 –28 49 37.06 18.08 16.93 15.87 13.75
F100 17 45 51.061 –28 49 17.61 17.57 16.55 15.59 13.77
F101 17 45 50.914 –28 49 18.37 17.55 16.53 15.58 13.78 14(11) O6-8 V
F102 17 45 50.876 –28 49 28.80 18.24 17.07 15.93 13.78 4(4) O5-8 V
F103 17 45 49.679 –28 49 22.58 20.16 18.68 17.17 14.53
F104 17 45 50.577 –28 49 43.77 18.09 16.96 15.85 13.79
F105 17 45 50.596 –28 49 39.60 19.13 17.75 16.37 13.81
F106 17 45 49.886 –28 49 23.23 13.82
F107 17 45 49.872 –28 49 30.99 18.01 16.89 15.77 13.87
F108 17 45 50.809 –28 49 10.93 18.12 17.00 15.94 13.89
F109 17 45 50.520 –28 49 20.70 18.00 16.91 15.86 13.91
F110 17 45 50.574 –28 49 16.35 18.00 16.93 15.90 13.93 18(10) ≥O8 V
F111 17 45 50.309 –28 49 03.86 18.45 17.25 16.13 13.94
F112 17 45 50.507 –28 49 16.36 17.86 16.80 15.81 13.87 14(10) O6-8 V
F113 17 45 50.017 –28 49 17.47 18.67 17.42 16.22 13.97
F114 17 45 50.804 –28 49 19.07 17.95 16.90 15.90 13.99 22(10) O6-8 V
F115 17 45 50.437 –28 49 20.04 17.99 16.91 15.83 13.83 15(10) O5-6 V
F116 17 45 50.537 –28 49 06.28 18.77 17.68 16.63 14.01
F117 17 45 50.755 –28 49 19.44 18.05 16.99 15.97 14.06 25(10) O6-8 V
F118 17 45 50.453 –28 49 25.97 18.66 17.44 16.28 14.08 4(2) ≥O8 V Low S/N
F119 17 45 50.842 –28 49 22.75 18.18 17.09 16.06 14.06 6(5) ≥O8 V Low S/N
F120 17 45 50.692 –28 49 29.96 18.75 17.52 16.34 14.09
F121 17 45 50.204 –28 49 19.64 18.53 17.35 16.24 14.09 5(5) ≥O8 V Low S/N
F122 17 45 50.358 –28 49 17.28 18.17 17.09 16.05 14.09
F123 17 45 50.685 –28 49 22.35 14.11
F124 17 45 50.718 –28 49 17.26 18.48 17.42 16.38 14.11
F125 17 45 51.488 –28 49 21.75 19.57 18.12 16.69 14.15
F126 17 45 50.930 –28 49 03.63 17.93 16.93 15.98 14.16
F127 17 45 51.184 –28 49 31.52 19.45 18.05 16.67 14.16
F128 17 45 51.216 –28 49 36.53 18.51 17.37 16.28 14.18
F129 17 45 49.529 –28 49 12.72 19.73 18.27 16.82 14.20
F130 17 45 50.605 –28 49 27.50 18.80 17.58 16.40 14.21
F131 17 45 50.163 –28 49 27.46 19.11 17.80 16.55 14.23 1(1) ≥O8 V Low S/N
F132 17 45 50.796 –28 49 02.68 18.47 17.34 16.28 14.27
F133 17 45 50.771 –28 49 14.97 18.24 17.19 16.19 14.27
F134 17 45 50.499 –28 49 36.54 19.21 17.93 16.75 14.28
F135 17 45 50.363 –28 49 25.73 18.83 17.61 16.43 14.29 2(2) ≥O8 V Low S/N
F136 17 45 50.077 –28 49 27.84 19.59 18.18 16.83 14.30 5(5) O6-8 V
F137 17 45 51.486 –28 49 21.26 19.94 18.45 16.93 14.32
F138 17 45 50.212 –28 49 39.21 19.64 18.24 16.90 14.35
F139 17 45 51.207 –28 49 23.41 18.59 17.48 16.33 14.36 1(1) Low S/N
F140 17 45 50.564 –28 49 18.48 18.44 17.38 16.34 14.38
F141 17 45 48.827 –28 49 18.81 20.08 18.57 17.06 14.39
F142 17 45 50.689 –28 49 24.93 18.63 17.50 16.43 13.41
F143 17 45 50.716 –28 49 17.24 14.43
F144 17 45 51.526 –28 49 20.58 19.33 18.05 16.79 14.43
F145 17 45 51.445 –28 49 20.07 18.45 17.41 16.38 14.44
F146 17 45 49.867 –28 49 14.90 18.88 17.70 16.57 14.45
F147 17 45 51.354 –28 49 20.00 18.60 17.52 16.47 14.46
F148 17 45 51.785 –28 49 28.42 18.69 17.55 16.53 14.47
F149 17 45 50.682 —28 49 01.56 19.49 18.20 16.86 14.47
F150 17 45 50.456 –28 49 19.64 18.50 17.38 16.34 14.31 18(9) Featureless?
F151 17 45 50.829 –28 49 27.63 18.92 17.75 16.62 14.48 5(5) Featureless
F152 17 45 50.695 –28 49 36.56 19.21 17.96 16.77 14.48
F153 17 45 50.360 –28 49 20.00 19.15 17.92 16.74 14.51 8(6) ≥O8 V Low S/N
F154 17 45 49.992 –28 49 33.20 19.45 18.15 16.89 14.52
F155 17 45 50.422 –28 49 19.13 18.65 17.57 16.53 14.52 13(9) O6-8 V
F156 17 45 50.642 –28 49 02.15 19.31 18.04 16.76 14.54
F157 17 45 50.220 –28 49 24.18 19.11 17.89 16.71 14.55 10(10) ≥O8 V Low S/N
F158 17 45 51.096 –28 49 21.99 19.09 17.91 16.80 14.56
F159 17 45 50.882 –28 49 15.69 19.63 18.49 17.32 14.57 1(1) Low S/N
F160 17 45 50.500 –28 49 15.81 18.61 17.55 16.55 14.59
F161 17 45 50.895 –28 49 40.68 19.75 18.43 17.06 14.59
F162 17 45 50.820 –28 49 39.10 18.85 17.69 16.56 14.59
F163 17 45 50.436 –28 49 23.40 19.84 14.60
F164 17 45 50.862 –28 49 08.47 18.60 17.54 16.54 14.61
F165 17 45 51.160 –28 49 15.36 18.60 17.50 16.52 14.65
F166 17 45 50.675 –28 49 19.57 18.62 17.57 16.52 14.69 23(9) Blend
F167 17 45 50.733 –28 49 17.73 18.24 17.22 16.29 14.42
F168 17 45 50.495 –28 49 30.21 19.47 18.21 17.00 14.70 1(1) Low S/N
F169 17 45 50.377 –28 49 20.26 19.13 17.91 16.84 14.72
F170 17 45 50.704 –28 49 20.96 18.74 17.67 16.63 14.74 12(5) Blend
F171 17 45 49.275 –28 49 12.13 19.19 18.00 16.86 14.76
F172 17 45 50.232 –28 49 17.52 19.05 17.90 16.84 14.76 4(4) ≥O8 V Low S/N
F173 17 45 50.204 –28 49 20.24 19.10 17.93 16.83 14.80 1(1) Low S/N
F174 17 45 50.745 –28 49 28.20 19.26 18.09 16.95 14.81 3(3) Low S/N
F175 17 45 50.463 –28 49 03.29 19.72 18.44 17.18 14.82
F176 17 45 50.283 –28 49 23.85 19.25 18.05 16.94 14.83 3(3) Featureless
F177 17 45 50.604 –28 49 16.87 18.94 17.85 16.81 14.83 12(8) ≥O8 V Low S/N
F178 17 45 50.824 –28 49 06.95 20.09 18.72 17.32 14.85
F179 17 45 51.356 –28 49 21.37 19.53 18.30 17.08 14.85
F180 17 45 50.284 –28 48 59.64 19.72 18.43 17.15 14.89
F181 17 45 50.567 –28 49 07.70 18.84 17.79 16.79 14.90
F182 17 45 50.586 –28 49 22.91 19.00 17.85 16.76 14.70
F183 17 45 49.872 –28 49 42.31 20.25 18.83 17.39 14.93
F184 17 45 50.008 –28 49 29.43 20.15 18.75 17.40 14.94 3(3) Low S/N
F185 17 45 50.282 –28 49 27.56 19.65 18.40 17.18 14.95 2(2) ≥O8 V Low S/N
F186 17 45 50.001 –28 49 28.24 20.43 19.01 17.61 14.95 6(6) ≥O8 V Low S/N
F187 17 45 50.542 –28 49 23.30 19.22 18.10 17.05 14.96
F188 17 45 50.936 –28 49 21.80 19.02 17.93 16.91 14.97 2(2) ≥O8 V Low S/N
F189 17 45 50.595 –28 49 23.52 18.91 17.79 16.69 14.77 3(3) Featureless
F190 17 45 49.759 –28 49 19.76 19.44 18.25 17.14 14.99
F191 17 45 51.140 –28 49 18.17 18.83 17.79 16.84 15.00
F192 17 45 50.048 –28 49 04.94 19.70 18.43 17.16 15.00
F193 17 45 50.383 –28 49 09.56 19.08 17.98 16.93 15.00
F194 17 45 50.531 –28 49 07.93 20.41 19.00 17.62 15.01
F195 17 45 50.530 –28 49 15.30 19.11 18.00 17.01 15.03
F196 17 45 50.463 –28 49 07.74 19.55 18.35 17.18 15.03

Notes. Column 1 indicates the nomenclature for cluster members adopted by Fi02 and Blum et al. (2001), cols. 2 and 3 the J2000 coordinates, cols. 4–6 the new HST WFC3 photometry described in Sect. 2.2 and col. 7 F205W filter photometry from Fi02. Column 8 presents the total number of VLT/SINFONI data-cubes available for individual objects, with the number in parentheses being the number of epochs on which these data were obtained ((a,b,c) denotes that, respectively, 1, 2, or 3 epochs of spectroscopy were not employed due to low S/N). Column 9 provides a spectral classification where spectra are available, while the final column provides additional notes including the presence of radio (data from Lang et al. 2005, where (1) denotes a radio variable source) and X-ray detections Wang et al. (2006). As described in Sect. 3, F11, F46, F51, and F99 appear to be foreground M stars and so are excluded from this compilation; it would appear likely that other interlopers may also be present amongst those stars without current spectral classifications.

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