2023A&A...670A.108S

Query : 2023A&A...670A.108S

2023A&A...670A.108S - Astronomy and Astrophysics, volume 670A108 (2023/2-1)

The early evolution of young massive clusters The kinematic history of NGC 6611/M16.

STOOP M., KAPER L., DE KOTER A., GUO D., LAMERS H.J.G.L.M. and RIEDER S.

Abstract (from CDS):


Context. Young massive clusters provide the opportunity to study the outcome of the star formation process and the early evolution of star clusters. In the first few million years, the (massive) stars dynamically interact, producing runaways and affecting the initial (binary) population.
Aims. Observing and interpreting the dynamics of young massive clusters is key to our understanding of the star formation process and predicting the outcome of stellar evolution, for example the number of gravitational wave sources.
Methods. We have studied NGC 6611 in the Eagle Nebula (M16), a young massive cluster hosting ∼19 O stars. We used Gaia EDR3 data to determine the membership, age, cluster dynamics, and the kinematics of the massive stars including runaways.
Results. The membership analysis yields 137 members located at a mean distance of 1706 ± 7 pc. The colour - absolute magnitude diagram reveals a blue and a red population of pre-main-sequence stars, consistent with two distinct populations of stars. In line with earlier studies, the youngest (reddest) population has a mean extinction of AV = 3.6 ± 0.1 mag and an age of 1.3 ± 0.2 Myr, while the older population of stars has a mean extinction of AV = 2.0 ± 0.1 mag and an age of 7.5 ± 0.4 Myr. The latter population is more spatially extended than the younger generation of stars. We argue that most of the OB stars belong to the younger population. We identify eight runaways originating from the centre of NGC 6611, consistent with the dynamical ejection scenario.
Conclusions. We have studied the kinematics of the O stars in detail and show that ≳50% of the O stars have velocities comparable to or greater than the escape velocity. These O stars can be traced back to the centre of NGC 6611 with kinematic ages ranging from 0 to 2 Myr. These results suggest that dynamical interactions played an important role in the early evolution of NGC 6611, which is surprising considering the relatively low current stellar density (0.1-1 × 103M⊙ pc–3). Comparing our results to simulations of young massive clusters, the initial radius of 0.1-0.5 pc (needed to produce the observed O star runaway fraction) is not consistent with that of NGC 6611. We propose a scenario where the O stars initially form in wide binaries or higher order systems and possibly harden through dynamical interactions.

Abstract Copyright: © The Authors 2023

Journal keyword(s): HII regions - open clusters and associations: individual: NGC 6611 - astrometry - stars: kinematics and dynamics - stars: massive

VizieR on-line data: <Available at CDS (J/A+A/670/A108): tablec1.dat>

Simbad objects: 163

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Number of rows : 163
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
3 * iot Ori SB* 05 35 25.9861932063 -05 54 35.598684624 1.45 2.53 2.77     O9IIIvar 793 0
4 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
5 * mu. Col V* 05 45 59.8950238944 -32 18 23.162261796 3.84 4.90 5.18 5.30 5.57 O9.5V 523 0
6 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 400 0
7 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
8 Cl Westerlund 1 OpC 16 47 02.4 -45 51 07           ~ 655 1
9 HD 165319 * 18 05 58.8359515224 -14 11 52.998222768 8.15 8.63 8.04 7.50 7.00 O9.7Ib 86 1
10 UCAC2 27149134 * 18 15 23.9659316952 -13 19 35.837070492           ~ 5 0
11 Cl Trumpler 32 OpC 18 17 11.0 -13 21 13     12.2     ~ 33 0
12 BD-13 4912 Y*O 18 17 51.0437589960 -13 50 55.782928464 11.36 11.32 10.01 9.93   B2.5I 26 0
13 NGC 6611 555 Y*O 18 17 52.1678476944 -13 53 03.497447530   13.50 12.95     ~ 6 0
14 NGC 6604 OpC 18 18 03 -12 14.5           ~ 146 0
15 Gaia DR3 4146611605109426432 Y*O 18 18 05.5290316608 -13 47 03.104901204           ~ 5 0
16 Cl* NGC 6611 GMD 1193 Y*O 18 18 08.1954695592 -13 50 23.918922204 22.054 20.204 18.367   16.114 ~ 8 0
17 NGC 6611 42 Y*O 18 18 12.2850874608 -13 47 43.873361700 18.346 17.354 16.072   14.354 ~ 13 0
18 Gaia DR3 4146617205751575168 * 18 18 15.4988562382 -13 39 37.836147326           ~ 3 0
19 2MASS J18181685-1338574 Y*? 18 18 16.8541283520 -13 38 57.157391508 21.594 18.379 17.039   15.521 ~ 3 0
20 Gaia DR3 4146592054422916608 Y*O 18 18 17.1492593125 -13 55 49.984965375           ~ 3 0
21 Gaia DR3 4146617240111308544 * 18 18 18.4860427451 -13 39 22.708926706           ~ 1 0
22 2MASS J18181971-1351026 Y*O 18 18 19.7190422400 -13 51 02.742093936 18.563 17.400 15.933   14.197 ~ 8 0
23 Cl* NGC 6611 BKP 31984 Y*O 18 18 20.5047492120 -13 59 48.490552608   16.837 15.792     ~ 3 0
24 NGC 6611 584 Y*O 18 18 23.6400154719 -13 36 28.018033549 12.94 13.07 12.02     O9V 23 0
25 Gaia DR3 4146613559321611264 * 18 18 24.0579377111 -13 44 00.170824635           ~ 2 0
26 NGC 6611 112 Y*O 18 18 25.2191742672 -13 53 19.434041340 14.52 14.40 13.89     Ae 15 0
27 Gaia DR3 4146613597978990080 Y*O 18 18 28.4114860183 -13 42 52.800202532           ~ 5 0
28 NGC 6611 143 Y*O 18 18 28.8925751376 -13 47 53.994912648 18.039 16.897 15.489   13.754 ~ 11 0
29 NGC 6611 151 Y*O 18 18 29.3478205656 -13 42 04.159385532 15.58 15.44 14.05     B1:V 15 0
30 NGC 6611 149 Y*O 18 18 29.5693873800 -13 49 09.348846420   16.096 15.229     ~ 7 0
31 NGC 6611 583 * 18 18 29.8852537056 -13 36 24.835940532   12.40 12.30     B9III 12 0
32 NGC 6611 153 Y*? 18 18 29.9480056056 -13 46 51.762969876   16.37 15.509     ~ 8 0
33 BD-13 4921 Y*O 18 18 29.9553677376 -13 49 57.614440296 9.81 10.41 9.91     B0.7V 58 0
34 Cl* NGC 6611 GMD 891 Y*O 18 18 30.4058469288 -13 51 47.234250684 19.930 18.499 16.814   14.893 ~ 10 0
35 NGC 6611 161 Y*O 18 18 30.9568964448 -13 43 08.219371944 12.13 12.456 11.215 11.01 9.376 O8IV 38 0
36 NGC 6611 156 Y*O 18 18 31.4752544112 -13 56 19.136726952   15.356 14.780     ~ 7 0
37 LS IV -13 14 Y*O 18 18 32.2227699960 -13 48 48.055623228 11.343 11.024 10.296 10.38 9.430 O9V 56 0
38 BD-13 4923 Y*O 18 18 32.7310836576 -13 45 11.867150808 11.184 10.85 10.08 10.04 8.529 O4V((f+))+O7.5V 60 0
39 NGC 6611 177 Y*O 18 18 32.8479392208 -13 45 04.601711052   16.397 15.292     ~ 10 0
40 2MASS J18183339-1346044 Y*O 18 18 33.4024432680 -13 46 04.491192252 21.708 20.064 17.858   15.218 ~ 7 0
41 NGC 6611 186 Y*O 18 18 33.8724462120 -13 45 42.202120572   16.028 15.151     ~ 9 0
42 Gaia DR3 4146612700334401024 * 18 18 35.2647605186 -13 44 34.258143483           ~ 3 0
43 NGC 6611 192 Y*O 18 18 35.9603434920 -13 51 27.156469464   16.856 15.955     ~ 9 0
44 NGC 6611 202 Y*O 18 18 36.0133590282 -13 45 13.141419085   15.2 14.40     A0 17 0
45 HD 168075 Y*O 18 18 36.0418343184 -13 47 36.449731536 8.62 9.22 8.77 9.45   O7V(n)((f))z 149 0
46 2MASS J18183622-1346191 Y*O 18 18 36.2324273280 -13 46 19.152995088 19.746 18.360 16.647   14.569 ~ 9 0
47 NGC 6611 194 Y*O 18 18 36.3151355472 -13 51 34.439606280   14.38 13.80     B9 13 0
48 HD 168076 Y*O 18 18 36.4205083536 -13 48 02.420915796 8.12 8.72 8.25 7.62 7.21 O4III(f) 209 0
49 Cl* NGC 6611 PPM 29 Y*O 18 18 36.6537307608 -13 47 19.401665640   14.880 13.869   12.596 ~ 9 0
50 2MASS J18183668-1348205 Y*O 18 18 36.6845029344 -13 48 20.568864780 21.777 19.430 17.506   15.234 ~ 7 0
51 NGC 6611 210 Y*O 18 18 36.9748262760 -13 47 52.763758440 11.23 12.03 11.47     B1V 35 0
52 NGC 6611 222 Y*O 18 18 37.4984975040 -13 43 39.417078468 14.971 14.487 12.968   10.692 O7V((f))z 35 0
53 NGC 6611 223 Y*O 18 18 37.8647752080 -13 46 35.150559996 11.44 11.80 11.06     B1V 38 0
54 NGC 6611 224 Y*O 18 18 37.8866110104 -13 46 29.433566928 17.496 16.358 14.800   12.884 ~ 14 0
55 NGC 6611 228 Y*O 18 18 38.1383029656 -13 44 25.457011836 14.931 14.35 13.42   11.843 B1.5Vp 22 0
56 2MASS J18183829-1347515 Y*O 18 18 38.2990911046 -13 47 51.520715518 21.772 20.005 18.008   15.722 ~ 8 0
57 NGC 6611 227 Y*O 18 18 38.4019036872 -13 47 09.063135564 13.18 13.487 12.753   11.792 B1.5Ve 37 0
58 2MASS J18183854-1351101 Y*O 18 18 38.5476760632 -13 51 10.308202344 20.698 19.292 17.507   15.514 ~ 8 0
59 2MASS J18183871-1348539 Y*O 18 18 38.7199008384 -13 48 54.009662652 21.738 19.955 18.033   15.830 ~ 8 0
60 Cl* NGC 6611 PPM 61 Y*O 18 18 38.8863348552 -13 46 12.510210036 19.762 18.243 16.355   14.163 ~ 10 0
61 Cl* NGC 6611 BKP 29818 Y*O 18 18 38.9022087648 -13 57 25.687887948   15.252 14.743     ~ 5 0
62 NGC 6611 233 Y*O 18 18 39.1476201312 -13 50 39.241490640   16.131 15.273     ~ 7 0
63 2MASS J18183917-1346049 Y*O 18 18 39.1808209536 -13 46 04.931869656 21.441 19.526 17.511   15.145 ~ 8 0
64 Cl* NGC 6611 PPM 32 Y*O 18 18 39.3727282656 -13 47 11.784918192   17.482 15.863   13.975 ~ 11 0
65 Cl* NGC 6611 BKP 29817 Y*O 18 18 39.5883035904 -13 57 23.580198792   16.022 14.766     ~ 7 0
66 NGC 6611 238 Y*O 18 18 39.5994140712 -13 50 53.993374728   14.04 13.37 13.53 12.38 A2IV 10 0
67 2MASS J18183970-1348411 Y*O 18 18 39.7225746960 -13 48 41.216720076 19.383 18.094 16.432   14.530 ~ 10 0
68 NGC 6611 243 Y*O 18 18 39.7527077952 -13 46 56.379017100 14.979 14.453 13.705   12.728 B8Ve 25 0
69 LS IV -13 17 Y*O 18 18 39.9943123536 -13 54 33.511450680 11.42 11.978 11.474   10.870 B1V 29 0
70 Cl* NGC 6611 BKP 29617 Y*O 18 18 40.0704621144 -13 44 55.817025828 19.281 17.903 16.129   13.888 ~ 11 0
71 BD-13 4927 Y*O 18 18 40.0938541704 -13 45 18.603231696 10.12 10.14 9.48 9.71   O7II(f) 82 0
72 NGC 6611 251 Y*O 18 18 40.3593669960 -13 46 18.081271128 14.484 14.066 13.259   12.184 B2Ve 26 0
73 2MASS J18184123-1347477 Y*O 18 18 41.2373132352 -13 47 47.764532184 21.367 20.484 18.464   16.185 ~ 8 0
74 2MASS J18184141-1347082 Y*O 18 18 41.4285474672 -13 47 08.318287752 21.322 19.584 17.623   15.381 ~ 8 0
75 2MASS J18184147-1346504 Y*O 18 18 41.4716224728 -13 46 50.418100020   19.564 17.670   15.485 ~ 7 0
76 NGC 6611 266 Y*O 18 18 41.5798507368 -13 46 30.924135624 16.711 15.701 14.267   12.510 G 23 0
77 NGC 6611 267 Y*O 18 18 41.6931488496 -13 46 43.854056976 13.43 13.63 13.07     B3V 20 0
78 2MASS J18184171-1348062 * 18 18 41.7117115008 -13 48 06.255760536         16.272 ~ 5 0
79 2MASS J18184180-1346151 Y*O 18 18 41.8089188736 -13 46 15.192825168 19.787 18.135 16.179   13.882 ~ 8 0
80 Cl* NGC 6611 GMD 961 Or* 18 18 42.1800325872 -13 47 22.468425252 20.517 19.129 17.163   14.843 ~ 11 0
81 NGC 6611 275 * 18 18 42.1891056768 -13 46 52.017747852 12.19 12.51 11.96     B1.5V 25 0
82 Cl* NGC 6611 GMD 965 Y*O 18 18 42.5066011200 -13 47 17.850726780 23.090 20.479 18.483   16.103 ~ 9 0
83 BD-13 4928 Be* 18 18 42.7761777816 -13 46 50.969988732 10.05 10.604 10.044 10.23 9.345 O9.7IVnn 72 0
84 NGC 6611 281 Y*O 18 18 42.8896213392 -13 46 42.652860492 14.58 14.39 13.80     Ae 18 0
85 NGC 6611 282 Y*O 18 18 43.4882207586 -13 52 24.497653912   15.664 14.991     ~ 8 0
86 [HMS93] J181843.60-135219.6 Y*O 18 18 43.5424525632 -13 52 19.517011500   17.63 16.69     ~ 6 0
87 NGC 6611 289 Y*O 18 18 44.0879844480 -13 48 56.499936408 12.89 13.11 12.57     B3V 25 0
88 Cl* NGC 6611 GMD 433 Or* 18 18 44.2064804160 -13 48 17.500009572 21.600       16.099 ~ 12 0
89 Cl* NGC 6611 PPM 77 Y*O 18 18 44.2659336224 -13 45 14.458380660           ~ 5 0
90 Cl* NGC 6611 BKP 29495 Y*O 18 18 44.4640263722 -13 35 01.310025971   16.848 15.999     ~ 3 0
91 NGC 6611 297 Y*O 18 18 44.5246702680 -13 45 48.121323516 13.34 13.55 12.85     B1.5:V 32 0
92 NGC 6611 296 Y*O 18 18 44.6604719160 -13 47 56.406531264 12.589 12.350 11.718   10.947 B1.5V 33 0
93 Cl* NGC 6611 GMD 1155 Y*O 18 18 44.8198280040 -13 48 45.073185012 21.175 19.714 17.889   15.837 ~ 7 0
94 NGC 6611 290 Y*? 18 18 44.8427105160 -13 56 22.341188472 12.24 12.46 11.69     B2.5V 21 0
95 NGC 6611 305 Y*O 18 18 44.9722565664 -13 45 25.066905867 14.54 14.67 13.56     B1V 23 0
96 NGC 6611 306 Y*O 18 18 45.0318984936 -13 45 41.023635984 13.23 13.35 12.72     B1.5Ve 32 0
97 NGC 6611 300 Y*O 18 18 45.0400249440 -13 47 47.176122696 13.642 13.276 12.607   11.787 B1.5Ve 31 0
98 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
99 NGC 6611 307 Y*O 18 18 45.2535548376 -13 47 20.402438136 15.12 15.16 14.10     B1.5Ve 23 0
100 BD-13 4929 Y*O 18 18 45.8504419992 -13 46 30.898082136 10.05 10.509 10.23 10.02 8.830 O7V+B0.5V+B0.5V: 70 0
101 Cl* NGC 6611 GMD 1161 Or* 18 18 45.8661887712 -13 46 53.854605768 20.524 18.846 16.950   14.743 ~ 12 0
102 2MASS J18184591-1355220 Y*O 18 18 45.9237193272 -13 55 22.031591196 19.419 18.104 16.520   14.740 ~ 9 0
103 Cl* NGC 6611 GMD 289 Y*O 18 18 45.9624215256 -13 47 52.670108040 20.622 18.752 16.759   14.403 ~ 9 0
104 NGC 6611 313 Y*O 18 18 46.1329692120 -13 49 23.438011584   12.11 11.60     B5III 26 0
105 NGC 6611 322 Y*O 18 18 46.6060913616 -13 46 59.886730956 14.39 14.3 13.68   12.618 B8V:e 20 0
106 2MASS J18184668-1346519 Y*O 18 18 46.6840623048 -13 46 51.985745436 21.492 19.771 17.906   15.770 ~ 7 0
107 NGC 6611 323 Y*O 18 18 46.7447809896 -13 47 48.699157308 13.84 14.01 13.44     B5Ve 18 0
108 Gaia DR3 4146600811858666240 * 18 18 47.3323473208 -13 45 14.062551394           ~ 3 0
109 2MASS J18184762-1349035 Y*O 18 18 47.6275572360 -13 49 03.576083124 21.377 20.457 18.398   15.892 ~ 7 0
110 NGC 6611 336 Y*O 18 18 49.1681100312 -13 48 04.229034444 14.243 13.802 13.288   12.419 B5III 28 0
111 NGC 6611 339 Y*O 18 18 49.2032790240 -13 46 54.301258704   14.64 13.75     ~ 16 0
112 Cl* NGC 6611 GMD 241 Y*O 18 18 49.2651172104 -13 46 15.035250612 18.671 17.542 15.848   13.800 ~ 8 0
113 2MASS J18184947-1348454 Y*O 18 18 49.4828984040 -13 48 45.526381596 21.257 19.482 17.567   14.769 ~ 8 0
114 ISOGAL-P J181849.9-134659 Or* 18 18 49.8952357968 -13 46 59.640517272 20.959 19.244 17.400   14.820 ~ 13 1
115 LS IV -13 22 Em* 18 18 50.6843750856 -13 48 12.721046364 11.953 11.78 11.16   10.443 B1V 38 0
116 NGC 6611 360 Y*O 18 18 51.6824438832 -13 47 59.685212292 17.010 15.892 14.530   12.809 ~ 14 0
117 NGC 6611 364 Y*O 18 18 52.1000306064 -13 49 29.207834256   13.982 13.403   12.491 B7V 16 0
118 Cl* NGC 6611 GMD 210 Or* 18 18 52.2578250264 -13 46 39.098759016 21.237 19.761 17.956   15.399 ~ 12 0
119 BD-13 4930 Y*O 18 18 52.6749052848 -13 49 42.634556148 9.04 9.71 9.45   8.968 O9.7V 116 0
120 NGC 6611 371 Y*O 18 18 53.0133037800 -13 46 45.082792452 14.577 14.067 13.379   12.388 B0.5Ve 31 0
121 NGC 6611 374 dS* 18 18 53.2682646360 -13 46 07.183104924 15.529 14.406 13.347   11.968 F 25 0
122 NGC 6611 388 Y*O 18 18 54.9467872320 -13 48 45.845086428   14.28 13.70     B 19 0
123 NGC 6611 396 Y*O 18 18 55.5847278072 -13 48 44.550286632 16.369 15.305 13.965   12.326 G8 21 0
124 NGC 6611 400 Y*O 18 18 55.8331505520 -13 46 54.058308492 14.248 13.493 12.789   11.770 B9III 30 0
125 HD 168137 Y*O 18 18 56.1894798360 -13 48 31.092549588 8.72 9.36 8.94 9.55   O8Vz 131 0
126 2MASS J18185629-1353593 Y*? 18 18 56.2997873760 -13 53 59.222064444 17.458 16.598 15.733   14.502 ~ 9 0
127 NGC 6611 404 Y*O 18 18 56.4598788264 -13 50 12.450199416   17.139 16.209     ~ 8 0
128 2MASS J18185721-1347081 Y*O 18 18 57.2137184208 -13 47 08.279914524 21.038 19.391 17.695   15.504 ~ 7 0
129 Cl* NGC 6611 BKP 29822 Y*O 18 18 57.2759644944 -13 57 43.852517532   16.192 15.365     ~ 7 0
130 V* MZ Ser Or* 18 18 57.3705262656 -13 52 12.211495860 13 13.24 12.77 12.87   B2.5V 23 0
131 2MASS J18185866-1349384 Y*O 18 18 58.6731361440 -13 49 38.403779736   18.07 16.65     ~ 7 0
132 V* QR Ser SB* 18 18 58.6907022768 -13 59 28.456622916 7.92 8.55 8.28 9.07   O9.5III+B3-5V/III 91 0
133 NGC 6611 425 Y*O 18 18 58.7398171608 -13 50 01.348100232   16.821 16.022     ~ 8 0
134 NGC 6611 433 Y*O 18 18 58.8952247160 -13 41 41.383264596 15.85 15.73 14.60     B 11 0
135 Cl* NGC 6611 GMD 775 Y*O 18 19 00.3305267568 -13 47 26.393590716 22.688 20.034 18.220   15.754 ~ 7 0
136 NGC 6611 444 Y*O 18 19 00.4286432088 -13 42 41.013464796 14.057 13.635 12.594   11.289 B1.5V 28 0
137 NGC 6611 443 Y*O 18 19 00.5714257896 -13 45 50.320761372 17.070 16.071 14.738   13.112 ~ 12 0
138 NGC 6611 472 Y*O 18 19 04.7114310432 -13 44 44.557244268 13.07 13.421 12.846   12.109 B3Ve 22 0
139 BD-13 4933 Be* 18 19 04.8784525032 -13 48 20.444449032 11.259 11.095 10.628   9.915 B0.5Vn 51 0
140 BD-13 4934 Y*O 18 19 05.5681000896 -13 54 50.509739916 9.06 9.68 9.54     B1Vp 39 0
141 Cl* NGC 6611 GMD 214 Y*? 18 19 05.7811918656 -14 00 49.276264752 19.751 18.347 16.816   14.908 ~ 4 0
142 Cl* NGC 6611 GMD 521 Y*O 18 19 09.2116682880 -13 45 35.412997356   20.083 18.164   15.777 ~ 4 0
143 NGC 6611 505 Y*O 18 19 10.2054719880 -13 47 10.903372440   15.715 14.934     ~ 8 0
144 NGC 6611 507 Y*O 18 19 11.3587892880 -13 49 58.033871580   15.768 15.110     ~ 6 0
145 2MASS J18191155-1342383 Y*O 18 19 11.5591405728 -13 42 38.422890036   20.385 18.344   15.885 ~ 8 0
146 NGC 6611 597 Y*O 18 19 13.1059946448 -13 57 38.287741464 12.39 12.15 12.23     B2V 13 0
147 Cl* NGC 6611 MFH 17 Y*O 18 19 17.0824487808 -13 54 50.649706296 15.863 14.941 14.322   13.407 A1Ve 13 0
148 LS IV -13 30 * 18 19 18.4807882752 -13 55 40.086757524 11.32 11.78 11.42     B1.5V 29 0
149 Gaia DR3 4146594867623592704 * 18 19 18.9232503117 -13 54 55.404938457           ~ 4 0
150 NGC 6611 541 Y*O 18 19 19.1277318960 -13 43 52.351623480 13.69 13.83 13.17     B2.5V 20 0
151 2MASS J18192002-1349127 Y*O 18 19 20.0302662240 -13 49 12.819545796 19.290 18.114 16.656   14.851 ~ 9 0
152 BD-13 4937 Y*O 18 19 20.0319493560 -13 54 21.677384808 10.53 11.11 10.78     B1.5V 48 1
153 NGC 6611 546 Y*O 18 19 20.8872715464 -13 42 04.135631436 19.386 17.222 16.321   14.982 ~ 15 0
154 Gaia DR3 4152606589193262080 * 18 19 21.3511111722 -13 40 17.841713813           ~ 3 0
155 Gaia DR3 4146405584125976576 * 18 19 24.4712019576 -13 57 34.888694065           ~ 1 0
156 Gaia DR3 4152605657177150080 * 18 19 24.6824991239 -13 42 11.179686727           ~ 3 0
157 NGC 6611 611 Y*O 18 19 30.0301778808 -13 44 12.856610040   13.61 11.98     K0V 13 0
158 Gaia DR3 4146406821076538880 * 18 19 33.4469402696 -13 57 25.377055154           ~ 1 0
159 Cl* NGC 6611 BKP 25072 Y*O 18 19 39.9492268440 -13 53 43.909944396   15.55 14.531     ~ 6 0
160 HD 168504 * 18 20 34.0956630648 -13 57 15.717296484 9 9.64 9.29 9.67   O7.5V(n)z 44 0
161 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
162 LS IV -14 51 * 18 25 00.1488729504 -13 59 48.640922988 11.52 11.90 11.08 10.97   OB- 9 0
163 BD-14 5040 * 18 25 38.9003265072 -14 45 05.708025828   11.52 10.54 10.31   O5.5V(n)((f)) 37 0

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