2009ApJ...696.1278P

Query : 2009ApJ...696.1278P

2009ApJ...696.1278P - Astrophys. J., 696, 1278-1306 (2009/May-2)

The extended environment of M17: a star formation history.

POVICH M.S., CHURCHWELL E., BIEGING J.H., KANG M., WHITNEY B.A., BROGAN C.L., KULESA C.A., COHEN M., BABLER B.L., INDEBETOUW R., MEADE M.R. and ROBITAILLE T.P.

Abstract (from CDS):

M17 is one of the youngest and most massive nearby star-formation regions in the Galaxy. It features a bright H II region erupting as a blister from the side of a giant molecular cloud (GMC). Combining photometry from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) with complementary infrared (IR) surveys, we identify candidate young stellar objects (YSOs) throughout a 1°.5x1° field that includes the M17 complex. The long sightline through the Galaxy behind M17 creates significant contamination in our YSO sample from unassociated sources with similar IR colors. Removing contaminants, we produce a highly reliable catalog of 96 candidate YSOs with a high probability of association with the M17 complex. We fit model spectral energy distributions to these sources and constrain their physical properties. Extrapolating the mass function of 62 intermediate-mass YSOs (M{*}> 3 M ☉), we estimate that >1000 stars are in the process of forming in the extended outer regions of M17. The remaining 34 candidate YSOs are found in a 0.17 deg2 field containing the well-studied M17 H II region and photodissociation region (PDR), where bright diffuse mid-IR emission drastically reduces the sensitivity of the GLIMPSE point-source detections. By inspecting IR survey images from IRAS and GLIMPSE, we find that M17 lies on the rim of a large shell structure ∼0°.5 in diameter (∼20 pc at 2.1 kpc). We present maps of 12CO and 13CO (J = 2 -> 1) emission observed with the Heinrich Hertz Telescope. The CO emission shows that the shell is a coherent, kinematic structure associated with M17, centered at v = 19 km/s. The shell is an extended bubble outlining the PDR of a faint, diffuse H II region several Myr old. We identify a group of candidate ionizing stars within the bubble. YSOs in our catalog are concentrated around the bubble rim, providing evidence that massive star formation has been triggered by the expansion of the bubble. The formation of the massive cluster ionizing the M17 H II region itself may have been similarly triggered. We conclude that the star formation history in the extended environment of M17 has been punctuated by successive waves of massive star formation propagating through a GMC complex.

Abstract Copyright: ∼

Journal keyword(s): H II regions - infrared: ISM - radio continuum: ISM - radio lines: ISM - stars: formation

VizieR on-line data: <Available at CDS (J/ApJ/696/1278): table2.dat table3.dat table4.dat table5.dat>

Nomenclature: Table 2: [PCB2009] ENN (Nos E1-E62). Table 3: [PCB2009] FNNN (Nos F1-F135). Table 4: [PCB2009] XNN (Nos X1-X14), [PCB2009] NXNN (Nos NX1-NX20). Table 5: [PCB2009] NN (Nos 1-26). Text: NAME NGC 6618PG, NAME M17 EB.

Simbad objects: 276

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Number of rows : 276
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME NGC 6618 PG Cl* 01 01.0 -00 45           ~ 2 0
2 NAME M17 EB bub 01 01.6 -00 45           ~ 9 0
3 IC 1848 OpC 02 51 25.2 +60 25 08   6.87 6.5     ~ 491 2
4 NGC 1333 OpC 03 29 11.3 +31 18 36           ~ 1454 1
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4425 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17472 0
7 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1621 1
8 M 42 HII 05 35 17 -05 23.4           ~ 4081 0
9 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14454 0
10 [PCB2009] F45 Y*? 18 18 10.469 -16 06 01.12           ~ 1 0
11 IRAS 18152-1609 OH* 18 18 10.63800 -16 08 12.9372           O-rich 7 0
12 [PCB2009] F43 Y*? 18 18 11.567 -16 06 32.14           ~ 2 0
13 2MASS J18181283-1610527 Y*? 18 18 12.832 -16 10 52.80           ~ 1 0
14 [PCB2009] F33 Y*? 18 18 13.613 -16 10 39.77           ~ 2 0
15 2MASS J18181377-1601327 Y*? 18 18 13.7767292712 -16 01 32.866073832           ~ 1 0
16 2MASS J18181408-1606228 Y*? 18 18 14.086 -16 06 22.81           ~ 1 0
17 2MASS J18181433-1611388 Y*? 18 18 14.3000496000 -16 11 38.658364152           ~ 1 0
18 [PCB2009] F66 Y*? 18 18 17.082 -16 01 32.96           ~ 1 0
19 [PCB2009] F60 Y*? 18 18 17.676 -16 02 35.49           ~ 1 0
20 2MASS J18181803-1600107 Y*? 18 18 18.033 -16 00 10.71           ~ 1 0
21 2MASS J18181835-1612063 Y*? 18 18 18.3719045280 -16 12 06.417621900           ~ 1 0
22 [PCB2009] F69 Y*? 18 18 18.430 -15 59 48.10           ~ 1 0
23 SSTGLMC G014.8122-00.2346 AB? 18 18 21.111 -16 10 47.58           ~ 2 0
24 [PCB2009] F54 Y*? 18 18 22.101 -16 05 40.55           ~ 1 0
25 2MASS J18182814-1601351 AB? 18 18 28.141 -16 01 35.19           ~ 2 0
26 [PCB2009] F57 Y*? 18 18 29.012 -16 04 18.53           ~ 2 0
27 [PCB2009] F56 Y*? 18 18 29.2567661136 -16 05 54.729030624           ~ 1 0
28 [PCB2009] F36 Y*? 18 18 29.561 -16 11 02.06           ~ 2 0
29 2MASS J18182984-1604209 Y*? 18 18 29.849 -16 04 20.92           ~ 1 0
30 2MASS J18183284-1604114 Y*? 18 18 32.840 -16 04 11.48           ~ 1 0
31 [PCB2009] F63 Y*? 18 18 34.478 -16 04 10.67           ~ 1 0
32 2MASS J18183564-1554094 Y*? 18 18 35.648 -15 54 09.44           ~ 1 0
33 [PCB2009] F70 Y*? 18 18 36.163 -16 01 32.89           ~ 1 0
34 [PCB2009] F83 Y*? 18 18 36.327 -15 49 39.99           ~ 2 0
35 2MASS J18183776-1552253 Y*? 18 18 37.7573624256 -15 52 26.015600604           ~ 1 0
36 [PCB2009] F85 Y*? 18 18 39.488 -15 48 54.18           ~ 1 0
37 [PCB2009] F29 Y*? 18 18 43.294 -16 16 23.57           ~ 1 0
38 [PCB2009] F90 Y*? 18 18 44.939 -15 48 09.14           ~ 1 0
39 M 16 OpC 18 18 45.1 -13 47 31           ~ 1029 1
40 2MASS J18184651-1609101 Y*? 18 18 46.520 -16 09 10.13           ~ 1 0
41 [PCB2009] F42 Y*? 18 18 47.153 -16 11 25.79           ~ 1 0
42 [PCB2009] F86 Y*? 18 18 47.375 -15 49 24.08           ~ 1 0
43 [PCB2009] F88 Y*? 18 18 48.419 -15 48 59.40           ~ 1 0
44 [PCB2009] F92 Y*? 18 18 49.604 -15 46 42.01           ~ 1 0
45 [PCB2009] F91 Y*? 18 18 51.407 -15 48 56.83           ~ 1 0
46 [PCB2009] F84 Y*? 18 18 51.768 -15 51 32.25           ~ 1 0
47 2MASS J18185297-1557509 Y*? 18 18 52.9736312784 -15 57 51.016997808           ~ 1 0
48 2MASS J18185605-1557151 Y*? 18 18 56.0579854896 -15 57 15.091650972           ~ 1 0
49 [PCB2009] F51 Y*? 18 18 56.287 -16 10 26.36           ~ 1 0
50 [PCB2009] F75 Y*? 18 18 56.391 -15 57 19.59           ~ 1 0
51 [PCB2009] F93 Y*? 18 18 57.999 -15 46 44.05           ~ 1 0
52 [PCB2009] F78 Y*? 18 18 58.487 -15 57 24.68           ~ 1 0
53 2MASS J18185921-1603116 Y*? 18 18 59.213 -16 03 11.61           ~ 1 0
54 [PCB2009] F77 Y*? 18 18 59.892 -15 57 39.87           ~ 2 0
55 2MASS J18190061-1557258 Y*? 18 19 00.614 -15 57 25.88           ~ 2 0
56 [PCB2009] F79 Y*? 18 19 00.726 -15 57 33.17           ~ 1 0
57 2MASS J18190194-1612040 Y*? 18 19 01.948 -16 12 04.05           ~ 1 0
58 2MASS J18190322-1612192 Y*? 18 19 03.225 -16 12 19.30           ~ 2 0
59 SSTGLMC G014.5999-00.5422 AB? 18 19 03.762 -16 30 44.89           ~ 3 0
60 [PCB2009] E2 Y*? 18 19 05.112 -16 21 26.43           ~ 1 0
61 2MASS J18190564-1622454 Y*? 18 19 05.645 -16 22 45.45           ~ 1 0
62 [PCB2009] F7 Y*? 18 19 07.302 -16 30 24.30           ~ 4 0
63 [PCB2009] F55 Y*? 18 19 07.408 -16 11 06.96           ~ 1 0
64 2MASS J18190757-1559407 Y*? 18 19 07.577 -15 59 40.77           ~ 1 0
65 2MASS J18190773-1619154 Y*? 18 19 07.739 -16 19 15.42           ~ 1 0
66 [PCB2009] E5 Y*? 18 19 08.103 -16 17 55.95           ~ 2 0
67 2MASS J18190829-1612372 Y*? 18 19 08.296 -16 12 37.22           ~ 2 0
68 2MASS J18190848-1632159 Y*? 18 19 08.488 -16 32 15.94           ~ 4 0
69 2MASS J18191113-1613562 AB? 18 19 11.1281044488 -16 13 56.428144464           ~ 2 0
70 [PCB2009] F2 Y*? 18 19 11.382 -16 32 24.86           ~ 1 0
71 2MASS J18191212-1609410 Y*? 18 19 12.1287475728 -16 09 41.113313208           ~ 1 0
72 [PCB2009] E4 Y*? 18 19 13.274 -16 19 52.22           ~ 1 0
73 [PCB2009] F13 Y*O 18 19 13.934 -16 30 01.80           ~ 4 0
74 2MASS J18191417-1629510 Y*? 18 19 14.176 -16 29 51.01           ~ 2 0
75 2MASS J18191435-1630299 Y*O 18 19 14.35128 -16 30 29.9088           ~ 3 0
76 2MASS J18191479-1631091 Y*? 18 19 14.796 -16 31 09.14           ~ 2 0
77 2MASS J18191508-1630149 Y*? 18 19 15.082 -16 30 14.99           ~ 2 0
78 [PCB2009] F15 Y*? 18 19 15.251 -16 30 04.91           ~ 1 0
79 [PCB2009] F14 Y*? 18 19 15.432 -16 30 07.37           ~ 3 0
80 2MASS J18191585-1617123 Y*? 18 19 15.858 -16 17 12.36           ~ 1 0
81 2MASS J18191738-1609297 Y*? 18 19 17.3880128112 -16 09 29.744365752           ~ 1 0
82 2MASS J18191879-1609431 Y*? 18 19 18.8031305448 -16 09 43.218332820           ~ 2 0
83 2MASS J18192062-1632478 Y*? 18 19 20.623 -16 32 47.86           ~ 2 0
84 [PCB2009] E10 Y*? 18 19 21.146 -16 16 12.94           ~ 1 0
85 2MASS J18192155-1619089 AB? 18 19 21.558 -16 19 08.91           ~ 2 0
86 2MASS J18192203-1633033 Y*? 18 19 22.038 -16 33 03.39           ~ 1 0
87 2MASS J18192207-1632481 Y*? 18 19 22.0721524008 -16 32 48.085569420           ~ 3 0
88 2MASS J18192359-1632298 Y*O 18 19 23.599 -16 32 29.81           ~ 3 0
89 2MASS J18192364-1618135 AB? 18 19 23.645 -16 18 13.54           ~ 2 0
90 [PCB2009] F71 Y*? 18 19 24.414 -16 07 30.22           ~ 2 0
91 2MASS J18192770-1618133 Y*? 18 19 27.705 -16 18 13.32           ~ 2 0
92 2MASS J18193574-1522402 Y*? 18 19 35.741 -15 22 40.29           ~ 1 0
93 [PCB2009] F106 Y*? 18 19 37.044 -15 22 36.63           ~ 1 0
94 [PCB2009] E22 Y*? 18 19 37.888 -15 43 42.17           ~ 1 0
95 [PCB2009] E24 Y*? 18 19 39.550 -15 43 37.18           ~ 1 0
96 2MASS J18194044-1609585 Y*? 18 19 40.441 -16 09 58.50           ~ 1 0
97 [PCB2009] F113 Y*? 18 19 43.211 -15 21 25.18           ~ 1 0
98 [PCB2009] F111 Y*? 18 19 43.543 -15 22 08.75           ~ 1 0
99 2MASS J18194369-1522445 Y*? 18 19 43.691 -15 22 44.59           ~ 1 0
100 [PCB2009] F108 Y*? 18 19 43.722 -15 22 35.15           ~ 1 0
101 [PCB2009] F114 Y*? 18 19 43.769 -15 21 18.81           ~ 1 0
102 2MASS J18194510-1542228 Y*? 18 19 45.109 -15 42 22.84           ~ 2 0
103 2MASS J18194763-1528077 Y*O 18 19 47.6313453408 -15 28 07.752308448           ~ 3 0
104 ISOGAL-P J181949.1-154405 Y*? 18 19 49.126 -15 44 06.35           ~ 3 0
105 2MASS J18194957-1633561 Y*? 18 19 49.5633789360 -16 33 56.092765176           ~ 1 0
106 2MASS J18195061-1545383 Y*? 18 19 50.6451785328 -15 45 38.475920124           ~ 2 0
107 2MASS J18195258-1520551 Y*? 18 19 52.5837286128 -15 20 55.143701952           ~ 1 0
108 2MASS J18195395-1633334 Y*? 18 19 53.9518920528 -16 33 33.421490820           ~ 1 0
109 2MASS J18195536-1526321 Y*O 18 19 55.362 -15 26 32.19           ~ 4 0
110 [PCB2009] F12 Y*? 18 19 55.571 -16 35 25.34           ~ 1 0
111 [PCB2009] E16 Y*? 18 19 55.961 -15 59 56.36           ~ 2 0
112 [PCB2009] E14 Y*? 18 19 55.973 -16 00 31.36           ~ 1 0
113 [PCB2009] E13 Y*? 18 19 56.005 -16 01 27.56           ~ 3 0
114 SSTGLMC G015.6337-00.2282 Y*O 18 19 56.576 -15 27 10.73           ~ 2 0
115 2MASS J18195672-1546010 Y*? 18 19 56.7297912192 -15 46 00.996215448           ~ 2 0
116 2MASS J18195739-1545004 Y*? 18 19 57.394 -15 45 00.40           ~ 1 0
117 [PCB2009] F20 Y*? 18 19 57.7328294040 -16 34 46.862127300           ~ 1 0
118 HIGALBM G015.6538-00.2243 Y*O 18 19 58.116 -15 25 59.71           ~ 2 0
119 [PCB2009] E29 Y*? 18 19 58.662 -15 43 24.95           ~ 1 0
120 SSTGLMC G015.6051-00.2537 Y*O 18 19 58.833 -15 29 24.75           ~ 2 0
121 2MASS J18200250-1519291 Y*O 18 20 02.504 -15 19 29.18           ~ 3 0
122 2MASS J18200251-1633022 Y*? 18 20 02.5173996216 -16 33 02.172795300           ~ 2 0
123 2MASS J18200299-1602068 Y*O 18 20 02.9910453672 -16 02 06.733369212     13.1     O6-9V 7 0
124 2MASS J18200329-1618298 Y*? 18 20 03.298 -16 18 29.88           ~ 2 0
125 2MASS J18200486-1607215 Y*? 18 20 04.861 -16 07 21.58           ~ 1 0
126 2MASS J18200529-1530365 Y*O 18 20 05.293 -15 30 36.57           ~ 2 0
127 SSTGLMC G015.5815-00.2963 Y*O 18 20 05.412 -15 31 52.12           ~ 3 0
128 2MASS J18200562-1622463 Y*? 18 20 05.622 -16 22 46.32           ~ 1 0
129 2MASS J18200567-1601269 Y*? 18 20 05.672 -16 01 26.97           ~ 1 0
130 [PCB2009] NX3 Y*? 18 20 05.680 -16 16 23.16           ~ 2 0
131 [PCB2009] F98 Y*? 18 20 05.751 -15 31 12.10           ~ 1 0
132 [PCB2009] E25 Y*? 18 20 06.3 -15 46 44           ~ 1 0
133 2MASS J18200641-1605286 Y*? 18 20 06.415 -16 05 28.62           ~ 1 0
134 SSTGLMC G015.5869-00.3003 Y*O 18 20 06.913 -15 31 41.56           ~ 3 0
135 2MASS J18200765-1532362 Y*O 18 20 07.6530248232 -15 32 36.249187488           ~ 2 0
136 2MASS J18200918-1603553 Y*? 18 20 09.185 -16 03 55.34           ~ 1 0
137 [PCB2009] F110 Y*? 18 20 09.378 -15 25 37.73           ~ 1 0
138 2MASS J18200947-1520149 Y*O 18 20 09.4269978264 -15 20 15.347844240           ~ 3 0
139 2MASS J18200987-1525521 Y*O 18 20 09.8877077448 -15 25 52.311391392           ~ 2 0
140 2MASS J18200996-1524524 Y*O 18 20 09.963 -15 24 52.40           ~ 2 0
141 HIGALBM G015.7571-00.2229 Y*O 18 20 10.054 -15 20 29.90           ~ 2 0
142 2MASS J18201028-1532540 Y*? 18 20 10.2859285512 -15 32 53.889484848           ~ 1 0
143 2MASS J18201037-1612069 Y*O 18 20 10.378 -16 12 06.90           ~ 3 0
144 2MASS J18201051-1612247 Y*O 18 20 10.520 -16 12 24.76           ~ 4 0
145 2MASS J18201153-1617087 Y*? 18 20 11.534 -16 17 08.71           ~ 2 0
146 [PCB2009] F117 Y*? 18 20 11.660 -15 22 54.78           ~ 1 0
147 2MASS J18201194-1608246 Y*O 18 20 11.942 -16 08 24.64           ~ 2 0
148 BD-15 4928 ** 18 20 13.71600 -15 39 53.3160 10.21 11.08 10.44     OB 8 0
149 [PCB2009] F116 Y*? 18 20 14.4667210920 -15 23 22.634708244           ~ 1 0
150 2MASS J18201668-1519038 Y*? 18 20 16.6925827104 -15 19 03.899000136           ~ 1 0
151 2MASS J18201779-1614048 Y*O 18 20 17.7890290368 -16 14 04.766726580           ~ 2 0
152 2MASS J18201836-1517558 Y*? 18 20 18.3326857608 -15 17 55.521942324           ~ 1 0
153 [PCB2009] NX6 Y*? 18 20 18.822 -16 14 29.01           ~ 1 0
154 2MASS J18201898-1605234 Y*O 18 20 18.984 -16 05 23.46           ~ 2 0
155 [BFT2007] 123 Y*O 18 20 19.472 -16 13 29.89           ~ 6 0
156 2MASS J18201960-1610382 Y*O 18 20 19.607 -16 10 38.43           ~ 7 0
157 MSX5C G014.9957-00.6735 MIR 18 20 19.7 -16 13 31           ~ 37 2
158 [PCB2009] F129 Y*? 18 20 19.909 -15 18 06.07           ~ 1 0
159 [PCB2009] E39 Y*? 18 20 20.316 -15 37 06.96           ~ 1 0
160 [PCB2009] F17 Y*? 18 20 20.8903376208 -16 38 16.481621832           ~ 1 0
161 [PCB2009] E33 Y*? 18 20 21.374 -15 39 55.81           ~ 2 0
162 NGC 6618 258 Y*O 18 20 22.6995127512 -16 08 34.169829720 15.03 14.99 13.69     O9.5V 33 0
163 [PCB2009] E42 Y*? 18 20 22.779 -15 36 27.01           ~ 1 0
164 2MASS J18202288-1612207 Y*O 18 20 22.886 -16 12 20.73           ~ 4 0
165 [PCB2009] E48 Y*? 18 20 23.0944442040 -15 35 26.180353104           ~ 1 0
166 2MASS J18202336-1537557 Y*? 18 20 23.3615539536 -15 37 55.801466472           ~ 1 0
167 SSTGLMC G015.5330-00.4066 Y*? 18 20 23.92920 -15 37 33.1968           ~ 1 0
168 [PW2010] 483 Y*? 18 20 24.128 -16 38 08.29           ~ 2 0
169 [PCB2009] E32 Y*? 18 20 24.362 -15 40 41.34           ~ 1 0
170 2MASS J18202439-1608434 Y*O 18 20 24.3865813896 -16 08 43.368235944 17.69 16.97 15.55     O9.7V 30 0
171 2MASS J18202477-1515201 Y*? 18 20 24.774 -15 15 20.12           ~ 1 0
172 NAME M 17 UC1 HII 18 20 24.82 -16 11 34.9           ~ 56 1
173 NAME M 17S HII 18 20 25.1 -16 11 37           ~ 25 1
174 2MASS J18202514-1538346 Y*? 18 20 25.147 -15 38 34.69           ~ 1 0
175 [PCB2009] F132 Y*? 18 20 25.537 -15 08 50.60           ~ 1 0
176 NGC 6618 326 Y*O 18 20 25.8639501480 -16 08 32.406597600 16.39 15.87 14.20     O7:V(n) 36 0
177 [PCB2009] F19 Y*? 18 20 26.086 -16 38 28.54           ~ 3 0
178 2MASS J18202622-1609215 Y*O 18 20 26.2171303536 -16 09 21.518329608           ~ 2 0
179 [PCB2009] E38 Y*? 18 20 26.459 -15 38 12.93           ~ 2 0
180 2MASS J18202666-1607088 Y*O 18 20 26.6645633664 -16 07 08.708531124     17.5     B2V 9 0
181 [PCB2009] F27 Y*? 18 20 26.806 -16 35 56.52           ~ 2 0
182 2MASS J18202696-1636556 Y*? 18 20 26.9701506960 -16 36 55.674831924           ~ 2 0
183 2MASS J18202742-1613309 Y*O 18 20 27.4206604920 -16 13 30.969103332   12.45 11.28 10.6   O6.5V((f))z 31 0
184 [PCB2009] NX10 Y*? 18 20 27.666 -16 08 31.63           ~ 1 0
185 2MASS J18202802-1610589 Y*? 18 20 28.0223525064 -16 10 58.893403548           ~ 1 0
186 2MASS J18202809-1638360 Y*? 18 20 28.091 -16 38 36.02           ~ 2 0
187 2MASS J18202851-1636324 Y*? 18 20 28.513 -16 36 32.43           ~ 1 0
188 2MASS J18202855-1517291 Y*? 18 20 28.558 -15 17 29.14           ~ 1 0
189 2MASS J18202881-1610320 Y*? 18 20 28.8278838336 -16 10 31.883430108           ~ 1 0
190 2MASS J18202939-1616088 Y*? 18 20 29.395 -16 16 08.81           ~ 1 0
191 2MASS J18202963-1506599 Y*? 18 20 29.639 -15 06 59.94           ~ 1 0
192 Cl* NGC 6618 B 197 * 18 20 29.7833582352 -16 11 37.337489772   19.7 17.9     B3V 9 0
193 2MASS J18202985-1607529 Y*? 18 20 29.853 -16 07 52.96           ~ 3 0
194 NGC 6618 341 ** 18 20 29.862 -16 10 44.93 17.04 16.28 14.13     O4+O4 63 1
195 2MASS J18202994-1602162 Y*? 18 20 29.94960 -16 02 16.2564           ~ 2 0
196 2MASS J18203012-1603382 Y*O 18 20 30.128 -16 03 38.23           ~ 3 0
197 2MASS J18203022-1610349 Y*O 18 20 30.230 -16 10 34.95   19.4 17.4     ~ 17 0
198 2MASS J18203044-1610530 Y*O 18 20 30.4417713240 -16 10 53.061367908           ~ 22 0
199 2MASS J18203057-1611040 Y*O 18 20 30.578 -16 11 04.10           ~ 7 0
200 2MASS J18203083-1610075 Y*O 18 20 30.8347326504 -16 10 07.525548156 17.44 16.85 15.41     O6V 26 0
201 2MASS J18203135-1602381 Y*? 18 20 31.3542307176 -16 02 38.045438268           ~ 2 0
202 Cl* NGC 6618 B 150 Y*O 18 20 31.8402135936 -16 11 38.280543036   16.58 15.56     ~ 12 0
203 2MASS J18203257-1508356 Y*? 18 20 32.580 -15 08 35.70           ~ 2 0
204 [PCB2009] F28 Y*? 18 20 32.591 -16 35 24.04           ~ 1 0
205 2MASS J18203282-1601329 AB? 18 20 32.830 -16 01 32.97           ~ 7 0
206 2MASS J18203306-1611215 Y*O 18 20 33.061 -16 11 21.56           ~ 21 0
207 2MASS J18203431-1605516 Y*? 18 20 34.310 -16 05 51.63           ~ 1 0
208 NGC 6618 337 Y*O 18 20 34.4905832784 -16 10 11.837880948 12.27 12.40 11.29     O4V(n)((fc)) 42 0
209 2MASS J18203456-1507417 Y*? 18 20 34.5610764144 -15 07 41.746823688           ~ 1 0
210 2MASS J18203490-1601216 Y*? 18 20 34.909 -16 01 21.61           ~ 1 0
211 BD-16 4818 Y*O 18 20 35.3856109704 -16 10 48.509924232 10.62 10.67 10.03 10.02   O8.5V 50 0
212 [BFT2007] 732 Y*O 18 20 35.8614231264 -16 15 43.117132392   13.6 13.3     O6-9V 14 0
213 2MASS J18203739-1559393 Y*? 18 20 37.396 -15 59 39.34           ~ 2 0
214 2MASS J18203767-1603316 Y*O 18 20 37.673 -16 03 31.61           ~ 6 0
215 2MASS J18203785-1601390 Y*? 18 20 37.852 -16 01 39.01           ~ 1 0
216 OH 015.555-00.460 AB* 18 20 38.34936 -15 37 53.4972           O-rich 1 0
217 2MASS J18203912-1537469 Y*? 18 20 39.12240 -15 37 46.9632           ~ 1 0
218 [PCB2009] E46 Y*? 18 20 39.650 -15 37 51.37           ~ 1 0
219 NAME M 17 North MoC 18 20 40.19 -16 09 29.0           ~ 48 0
220 2MASS J18204050-1540261 Y*? 18 20 40.503 -15 40 26.12           ~ 1 0
221 2MASS J18204652-1537559 * 18 20 46.524 -15 37 56.00           B0.5-1V 1 0
222 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1615 0
223 BD-16 4822 Y*O 18 20 47.6957360952 -16 01 36.272211060 9.75 10.11 9.76 9.89   OB- 17 0
224 [PCB2009] E50 Y*? 18 20 48.2480688408 -15 35 47.109305940           ~ 1 0
225 2MASS J18204868-1522296 AB? 18 20 48.6808342512 -15 22 29.613286488           ~ 2 0
226 [PCB2009] F122 Y*? 18 20 49.044 -15 23 39.58           ~ 1 0
227 [PCB2009] F121 Y*? 18 20 49.528 -15 23 52.40           ~ 1 0
228 2MASS J18205036-1538299 Y*? 18 20 50.3544549648 -15 38 30.014438280           ~ 1 0
229 [PCB2009] F127 Y*? 18 20 50.625 -15 22 22.26           ~ 1 0
230 [PCB2009] E51 Y*? 18 20 50.717 -15 35 49.24           ~ 2 0
231 [PCB2009] F125 Y*? 18 20 52.0922145207 -15 23 05.025578329           ~ 1 0
232 [PCB2009] E53 Y*? 18 20 54.213 -15 33 50.90           ~ 1 0
233 [PCB2009] F124 Y*? 18 20 54.519 -15 23 39.88           ~ 1 0
234 TYC 6265-347-1 * 18 20 57.8783746968 -15 53 48.352066980 10.89 11.42 10.98 10.96   OB 10 0
235 MMB G015.665-00.499 Y*? 18 20 59.7470 -15 33 09.800           ~ 24 0
236 2MASS J18210112-1605471 Y*O 18 21 01.1234778168 -16 05 47.178503052 10.8 11.24 10.71 10.67   OB+ 19 0
237 2MASS J18210178-1535149 Y*? 18 21 01.7912060928 -15 35 14.930119284           ~ 2 0
238 BD-16 4826 Y*O 18 21 02.2332989664 -16 01 01.007289984 10.28 10.61 9.98 9.95   O5.5V((f))z 49 0
239 [PCB2009] E54 Y*? 18 21 05.370 -15 34 19.58           ~ 1 0
240 ISOGAL-P J182108.8-155658 Y*? 18 21 08.6945399184 -15 56 58.753529880   13.01 12.32 12.13   BV 6 0
241 HD 168585 * 18 21 10.3542509856 -16 00 21.295368504   9.47 9.28 9.16 9.186 B7/8II 20 0
242 [PCB2009] F39 Y*? 18 21 12.088 -16 30 04.56           ~ 3 0
243 [PCB2009] F40 Y*? 18 21 12.950 -16 30 09.91           ~ 1 0
244 [PCB2009] F41 Y*? 18 21 14.739 -16 30 23.06           ~ 1 0
245 2MASS J18211474-1630545 Y*? 18 21 14.744 -16 30 54.56           ~ 1 0
246 [PCB2009] F46 Y*? 18 21 15.228 -16 29 44.61           ~ 1 0
247 2MASS J18211544-1632355 Y*? 18 21 15.450 -16 32 35.60           ~ 1 0
248 [PCB2009] NX14 Y*? 18 21 18.603 -16 11 43.77           ~ 2 0
249 [PCB2009] NX15 Y*? 18 21 18.769 -16 11 40.78           ~ 1 0
250 BD-16 4831 Y*O 18 21 20.2937619360 -15 59 11.360505516 11.38 11.59 10.71 10.48   OB 18 0
251 [PCB2009] NX20 Y*? 18 21 20.491 -16 07 21.05           ~ 1 0
252 2MASS J18212449-1550095 Y*? 18 21 24.492 -15 50 09.52           ~ 2 0
253 IRAS 18185-1550 Y*? 18 21 26.7075292392 -15 48 51.369801192           ~ 1 0
254 2MASS J18213123-1609539 Y*? 18 21 31.2364859160 -16 09 54.132730344           ~ 1 0
255 [PCB2009] E58 Y*? 18 21 38.484 -15 33 00.45           ~ 1 0
256 2MASS J18214892-1524300 Y*? 18 21 48.921 -15 24 30.09           ~ 1 0
257 [PCB2009] E59 Y*? 18 21 51.747 -15 34 13.76           ~ 1 0
258 [PCB2009] E62 Y*? 18 21 54.876 -15 22 51.47           ~ 1 0
259 [PCB2009] E57 Y*? 18 21 56.851 -15 36 07.44           ~ 1 0
260 [PCB2009] E60 Y*? 18 22 02.777 -15 34 17.48           ~ 2 0
261 TYC 6265-2079-1 * 18 22 03.1318073880 -15 46 21.857798064 11.3 11.66 10.93 10.86   OB 15 0
262 2MASS J18220937-1540178 Y*? 18 22 09.3689353560 -15 40 17.846123556           ~ 1 0
263 [PCB2009] E41 Y*? 18 22 21.196 -15 51 52.13           ~ 2 0
264 2MASS J18222140-1554050 AB? 18 22 21.4072366536 -15 54 05.044039668           ~ 2 0
265 IRAS 18197-1555 Y*? 18 22 37.8899227800 -15 53 38.710432752           ~ 2 0
266 2MASS J18223791-1553337 Y*? 18 22 37.912 -15 53 33.80           ~ 1 0
267 [L89b] 28.823-00.226 bub 18 44 44.3 -03 45 34           ~ 78 0
268 [WBN74] W 51 IRS 2 SFR 19 23 39.93 +14 31 09.4           ~ 293 0
269 [PCB2009] F89 Y*? ~ ~           ~ 1 0
270 [PCB2009] F87 Y*? ~ ~           ~ 1 0
271 NAME Galactic Bulge reg ~ ~           ~ 4308 0
272 [CHK2004] KW 2 * ~ ~           ~ 3 1
273 [PCB2009] NX5 Y*? ~ ~           ~ 1 0
274 [CHK2004] KW 1 * ~ ~           ~ 3 1
275 [PCB2009] X2 Y*? ~ ~           ~ 1 0
276 [PCB2009] F53 Y*? ~ ~           ~ 1 0

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