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Table 1

List of the analyzed M17 sources.

Source SpT RA DEC V [mag] Emission
B111 O4.5 V 18:20:34.65 −16:10:11.3 11.3
B164 O6 Vz 18:20:31.03 −16:10:08.9 16.9
B311 O8.5 Vz 18:20:22.90 −16:08:34.3 13.7
B181 O9.7 III 18:20:30.39 −16:10:36.2 17.4
B289 O9.7 V 18:20:24.43 −16:08:45.8 17.0 IR
B215 B1 V 18:20:28.55 −16:12:13.5 - IR
B93 B2 V 18:20:35.80 −16:10:54.7 -
B205 B2 V 18:20:29.11 −16:11:13.3 16.1
CEN55 B2 III 18:20:29.08 −16:10:57.2 18.0
B234 B3 IV 18:20:27.42 −16:10:11.6 18.0
B213 B3 IV 18:20:28.61 −16:09:24.2 17.7
B253 B4 III 18:20:26.26 −16:11:04.4 15.7
B150 B5 V 18:20:31.78 −16:11:40.5 15.6 IR(†)
B272 B7 III 18:20:25.30 −16:09:42.7 18.2
B275 B7 III 18:20:25.19 −16:10:25.4 15.6 Gas and IR
B243 B9 III 18:20:26.41 −16:10:04.8 17.8 Gas and IR
B268 B9 III 18:20:25.25 −16:10:21.6 17.1 Gas and IR
B86 B9 III 18:20:36.16 −16:10:57.4 14.6

Notes. The final column indicates the circumstellar excess emission as identified in RT17. IR indicates that continuum IR excess emission is detected, and gas indicates that gas phase emission lines are detected in the optical and NIR spectra.(†) Result from this work.

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