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Table 1

Equatorial coordinates, photometry, spectral types, radial velocities and membership of stars with new spectra in Mc20.

Star Coordinates (J2000) HST photometry UKIDSS photometry Spectral νr Cluster
ID RA Dec m F160W m F222M P α J H K type [km s-1] member?
1 19h12m23.61s 9°57′37.4′′ Out of the field of view 11.37 − 9.76 B0-3 I 48 Yes
2 19h12m23.34s 9°57′04.2′′ 11.44 10.55 –0.04 12.52 11.33 10.45 O9.5-B0 I-II 61 Yes
3 19h12m23.18s 9°56′46.0′′ 10.53 9.74 –0.09 11.47 10.29 9.49 B2-4 I-II 19 Yes
4 19h12m25.81s 9°57′37.8′′ Out of the field of view 12.91 11.62 10.76 O9 I 41 Yes
5 19h12m24.18s 9°57′22.6′′ 13.23 12.26 –0.05 14.29 12.91 12.06 O9e 58 Yes
6 19h12m23.72s 9°57′19.0′′ 10.90 10.05 –0.05 −Unreliable− O9-9.5 I 24 Yes
7 19h12m22.73s 9°57′09.8′′ 11.79 10.86 –0.01 12.77 11.54 10.73 O9 II 34 Yes
8 19h12m24.05s 9°57′29.1′′ 11.84 10.66 –0.19 −Unreliable− WC 5-7 ? Yes
9 19h12m24.06s 9°57′28.2′′ 12.52 11.45 –0.05 −Unreliable− O6 If 48 Yes
10 19h12m24.17s 9°57′28.6′′ 11.22 9.96 –0.96 −Unreliable− WC 5-7 ? Yes
11 19h12m22.68s 9°57′15.5′′ 12.45 11.55 –0.03 13.53 12.12 11.26 O8.5-9 II 43 Yes
12 19h12m22.74s 9°57′05.3′′ 12.25 11.44 –0.03 13.26 12.02 11.27 O9 III 34 Yes
13 19h12m23.53s 9°57′29.7′′ 12.93 11.14 –0.03 15.52 12.53 10.95 KM 63 No
14 19h12m24.93s 9°56′52.6′′ 13.71 12.19 –0.02 15.74 13.33 12.09 KM −3 No
15 19h12m24.52s 9°57′18.4′′ 11.98 11.09 –0.11 13.25 11.79 10.89 O5 If 55 Yes
16 19h12m24.35s 9°57′30.5′′ 13.55 12.21 –0.44 14.84 13.18 11.91 FS CMa 45 Yes
17 19h12m23.29s 9°58′44.7′′ Out of the field of view 14.59 13.00 12.08 O9-B2 III-V 51 Yes

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