2004ApJ...607..904R

Query : 2004ApJ...607..904R

2004ApJ...607..904R - Astrophys. J., 607, 904-912 (2004/June-1)

Chandra observation of the Trifid nebula: X-ray emission from the O star complex and actively forming pre-main-sequence stars.

RHO J., RAMIREZ S.V., CORCORAN M.F., HAMAGUCHI K. and LEFLOCH B.

Abstract (from CDS):

The Trifid Nebula, a young star-forming H II region, was observed for 16 hr by the ACIS-I detector on board the Chandra X-Ray Observatory. We detected 304 X-ray sources, 30% of which are hard sources and 70% of which have near-infrared counterparts. Chandra resolved the HD 164492 multiple system into a number of discrete X-ray sources. X-ray emission is detected from components HD 164492A (an O7.5 III star that ionizes the nebula), B and C (a B6 V star), and possibly D (a Be star). Component C is blended with an unidentified source to the northwest. HD 164492A has a soft spectrum (kT~0.5 keV), while the component C blend shows much harder emission (kT~6 keV). This blend and other hard sources are responsible for the hard emission and Fe K line seen by ASCA, which was previously attributed entirely to HD 164492A. The soft spectrum of the O star is similar to emission seen from other single O stars and is probably produced by shocks within its massive stellar wind. Lack of hard emission suggests that neither a magnetically confined wind shock nor colliding wind emission is important in HD 164492A. A dozen stars are found to have flares in the field, and most of them are pre-main-sequence stars (PMS). Six sources with flares have both optical and Two Micron All Sky Survey counterparts. These counterparts are not embedded, and thus it is likely that these sources are in a later stage of PMS evolution, possibly Class II or III. Two flare sources did not have any near-IR, optical, or radio counterparts. We suggest that these X-ray flare stars are in an early PMS stage (Class I or earlier). We also detected X-ray sources apparently associated with two massive star-forming cores, TC 1 and TC 4. The spectra of these sources show high extinction and X-ray luminosities of (2-5)x1031 ergs/s. If these sources are Class 0 objects, it is unclear whether their X-ray emission is due to solar-type magnetic activities, as in Class I objects, or to some other mechanism.

Abstract Copyright: ∼

Journal keyword(s): ISM: Individual: Name: Trifid Nebula - Stars: Activity - Stars: Pre-Main-Sequence - X-Rays: Stars

VizieR on-line data: <Available at CDS (J/ApJ/607/904): table1.dat>

Nomenclature: Table 1: [RRC2004] NNN (Nos 1-304) = CXOM20 JHHMMSS.ss+DDMMSS.s N=304.

Simbad objects: 318

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Number of rows : 318
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 * tet01 Ori A Ae* 05 35 15.8254015008 -05 23 14.334699480 5.87 6.75 6.73 6.42 6.21 B0V 485 1
2 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1405 1
3 M 42 HII 05 35 17 -05 23.4           ~ 4077 0
4 [TUK93] 3 Y*O 05 35 18.32712 -05 00 32.9400           ~ 74 2
5 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 273 1
6 * tet02 Ori A SB* 05 35 22.9012398264 -05 24 57.832632108 5.37 6.30 6.39 6.30 6.35 O9.5IVp 544 0
7 NAME Ori A MoC 05 38 -07.1           ~ 3012 0
8 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 742 2
9 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1
10 CXOM20 J180150.61-225439.6 X 18 01 50.61 -22 54 39.6           ~ 1 0
11 CXOM20 J180150.79-225218.5 X 18 01 50.89 -22 52 19.0           ~ 1 0
12 CXOM20 J180152.54-225733.6 X 18 01 52.54 -22 57 33.6           ~ 1 0
13 CXOM20 J180153.57-225135.6 X 18 01 53.57 -22 51 35.6           ~ 1 0
14 CXOM20 J180157.18-230122.1 Y*O 18 01 57.216 -23 01 22.42           ~ 2 0
15 CXOM20 J180157.64-230001.7 Y*O 18 01 57.6782364120 -23 00 01.308638664           ~ 2 0
16 CXOM20 J180158.33-225226.5 Y*O 18 01 58.3518524184 -22 52 26.964195924           ~ 2 0
17 SSTGLMC G007.0889-00.0960 X 18 01 59.0303039544 -22 52 27.522693372           ~ 1 0
18 CXOM20 J180159.12-230055.3 X 18 01 59.12 -23 00 55.3           ~ 1 0
19 CXOM20 J180159.85-225314.8 Y*O 18 01 59.8693938792 -22 53 14.080200252           ~ 2 0
20 [RRC2004] 11 X 18 02 01.9736123376 -22 54 18.711225216           ~ 1 0
21 CXOM20 J180202.07-230056.2 X 18 02 02.07 -23 00 56.2           ~ 1 0
22 CXOM20 J180202.54-230232.5 X 18 02 02.54 -23 02 32.5           ~ 1 0
23 2MASS J18020317-2259099 Y*O 18 02 03.1731742848 -22 59 09.923241264           ~ 2 0
24 CXOM20 J180203.45-225607.2 Y*O 18 02 03.4231456392 -22 56 06.339049152           ~ 2 0
25 CXOM20 J180203.86-225258.0 Y*O 18 02 03.883 -22 52 57.64           ~ 3 0
26 CXOM20 J180204.75-230403.0 X 18 02 04.75 -23 04 03.0           ~ 1 0
27 2MASS J18020549-2255011 Y*O 18 02 05.5032908280 -22 55 01.202410308           ~ 2 0
28 [RRC2004] 19 * 18 02 06.0741084216 -23 00 51.103816092           ~ 1 0
29 2MASS J18020703-2257259 Y*O 18 02 07.0283377968 -22 57 25.920130428           ~ 2 0
30 2MASS J18020765-2257422 Y*O 18 02 07.6265168454 -22 57 42.277108381           ~ 3 0
31 2MASS J18020774-2255341 Y*O 18 02 07.7461505160 -22 55 34.125778920           ~ 3 0
32 CXOM20 J180207.75-225723.4 X 18 02 07.75 -22 57 23.4           ~ 1 0
33 2MASS J18020809-2257184 Y*O 18 02 08.0942919504 -22 57 18.479370348           ~ 2 0
34 2MASS J18020854-2259000 Y*O 18 02 08.5380170424 -22 59 00.041999568           ~ 3 0
35 CXOM20 J180209.18-230236.9 X 18 02 09.18 -23 02 36.9           ~ 1 0
36 CXOM20 J180209.42-225056.1 Y*O 18 02 09.428 -22 50 56.01           ~ 3 0
37 OGLE BLG761.6 399 WV* 18 02 09.9110252232 -23 04 27.019324920         17.058 ~ 5 0
38 2MASS J18021045-2255137 Y*O 18 02 10.4543395752 -22 55 13.763149572           ~ 2 0
39 2MASS J18021082-2255323 TT* 18 02 10.8262616448 -22 55 32.277578268           ~ 4 0
40 CXOM20 J180211.27-230411.9 Y*O 18 02 11.273 -23 04 12.28           ~ 2 0
41 2MASS J18021136-2256505 Y*O 18 02 11.3631719808 -22 56 50.541440784           ~ 2 0
42 CXOM20 J180211.63-225933.9 Y*O 18 02 11.6303536992 -22 59 33.659263104           ~ 3 0
43 CXOM20 J180211.66-225010.8 X 18 02 11.66 -22 50 10.8           ~ 1 0
44 2MASS J18021180-2256455 Y*O 18 02 11.7862059144 -22 56 45.754308204           ~ 2 0
45 2MASS J18021194-2255433 Y*O 18 02 11.9501850240 -22 55 43.393992708           ~ 2 0
46 CXOM20 J180212.26-230310.4 Y*O 18 02 12.264 -23 03 09.59           ~ 2 0
47 2MASS J18021248-2305488 NIR 18 02 12.48384 -23 05 48.8004           ~ 1 0
48 2MASS J18021267-2258523 Y*O 18 02 12.679 -22 58 52.36           ~ 3 0
49 CXOM20 J180212.79-225700.0 Y*O 18 02 12.758 -22 57 00.28           ~ 2 0
50 [CLC98] TC4 PoC 18 02 12.8 -23 05 47           ~ 12 0
51 2MASS J18021315-2301591 Y*O 18 02 13.1625619344 -23 01 59.157413256           ~ 2 0
52 CXOM20 J180213.38-230413.5 X 18 02 13.38 -23 04 13.5           ~ 1 0
53 2MASS J18021351-2257311 Y*O 18 02 13.5177728856 -22 57 31.193097948           ~ 2 0
54 CXOM20 J180213.83-225836.1 Y*O 18 02 13.831 -22 58 36.04           ~ 2 0
55 V* V1947 Sgr Or* 18 02 13.9427868192 -23 02 12.662132136           ~ 5 0
56 2MASS J18021437-2254212 Y*O 18 02 14.3705359896 -22 54 21.265588224           ~ 2 0
57 2MASS J18021556-2302223 Y*O 18 02 15.5700204696 -23 02 22.325998884           ~ 2 0
58 CXOM20 J180215.85-225827.4 Y*O 18 02 15.847 -22 58 27.28           ~ 2 0
59 [RCC2001] TTS 1 TT* 18 02 15.8722603512 -23 05 55.826774592           ~ 7 0
60 [RRC2004] 50 X 18 02 16.1524779936 -22 57 22.800308580           ~ 1 0
61 CXOM20 J180216.44-225939.5 Y*O 18 02 16.4385790824 -22 59 39.267796740           ~ 2 0
62 CXOM20 J180216.61-225836.8 Y*O 18 02 16.6160181624 -22 58 36.711427620           ~ 2 0
63 V* V2282 Sgr Or* 18 02 16.8116259264 -23 03 47.334461004       15.02 14.07 ~ 9 1
64 2MASS J18021702-2259176 Y*O 18 02 17.0228359848 -22 59 17.597914800           ~ 2 0
65 CXOM20 J180217.28-225750.9 X 18 02 17.28 -22 57 50.9           ~ 1 0
66 [RRC2004] 56 * 18 02 17.3773041216 -22 53 44.350059084           ~ 2 0
67 CXOM20 J180217.65-225618.0 Y*O 18 02 17.6382947976 -22 56 17.842264872           ~ 2 0
68 CXOM20 J180217.91-230407.3 Y*O 18 02 17.9307695568 -23 04 06.374262828           ~ 2 0
69 CXOM20 J180217.97-230014.0 Y*O 18 02 17.9787375168 -23 00 13.988929176           ~ 2 0
70 2MASS J18021816-2303434 Y*O 18 02 18.1651610280 -23 03 43.385560524           ~ 2 0
71 2MASS J18021883-2303426 Y*O 18 02 18.8512096656 -23 03 42.607621836           ~ 2 0
72 CXOM20 J180218.90-225145.1 X 18 02 18.90 -22 51 45.1           ~ 1 0
73 CXOM20 J180219.09-230332.7 Y*O 18 02 19.152 -23 03 32.97           ~ 2 0
74 2MASS J18021917-2253462 Y*O 18 02 19.17 -22 53 46.3           ~ 2 0
75 2MASS J18021918-2258364 Y*O 18 02 19.1949873048 -22 58 36.465689064           ~ 2 0
76 CXOM20 J180219.70-225940.6 Y*O 18 02 19.7132897928 -22 59 40.394191272           ~ 2 0
77 CXOM20 J180219.98-230121.3 Y*O 18 02 19.992 -23 01 21.06           ~ 2 0
78 [RRC2004] 68 Y*? 18 02 20.43 -23 03 15.7           ~ 2 0
79 CXOM20 J180220.57-225356.2 Y*O 18 02 20.574 -22 53 56.08           ~ 2 0
80 CXOM20 J180220.76-230241.1 Y*O 18 02 20.736 -23 02 41.28           ~ 2 0
81 2MASS J18022104-2259023 Y*O 18 02 21.0534075096 -22 59 02.372298612           ~ 2 0
82 2MASS J18022107-2303137 Y*O 18 02 21.0758302104 -23 03 13.745251224           ~ 3 0
83 2MASS J18022107-2301436 Y*O 18 02 21.0858342888 -23 01 43.570433208           ~ 2 0
84 CXOM20 J180221.20-230017.3 X 18 02 21.20 -23 00 17.3           ~ 1 0
85 CXOM20 J180221.26-225750.1 Y*O 18 02 21.264 -22 57 50.03           ~ 2 0
86 2MASS J18022129-2301290 Y*O 18 02 21.3038970456 -23 01 29.002994724           ~ 3 0
87 CXOM20 J180221.46-230102.5 Y*O 18 02 21.4705882560 -23 01 02.372323116           ~ 2 0
88 CXOM20 J180221.93-230057.7 Y*O 18 02 21.9265818576 -23 00 57.532867848           ~ 2 0
89 2MASS J18022194-2302068 Y*O 18 02 21.9512921616 -23 02 06.752827428           ~ 2 0
90 NGC 6514 149 * 18 02 21.9929175720 -23 02 25.560942180       13.13   ~ 7 0
91 CXOM20 J180222.04-225415.7 X 18 02 22.04 -22 54 15.7           ~ 1 0
92 2MASS J18022223-2301503 Y*O 18 02 22.2376833240 -23 01 50.315972916           ~ 2 0
93 CXOM20 J180222.27-230046.4 Y*O 18 02 22.286 -23 00 46.41           ~ 2 0
94 CXOM20 J180222.36-225635.2 Y*O 18 02 22.344 -22 56 35.04           ~ 2 0
95 CXOM20 J180222.36-224909.3 X 18 02 22.36 -22 49 09.3           ~ 1 0
96 2MASS J18022242-2302104 Y*O 18 02 22.4334105000 -23 02 10.374554076           ~ 2 0
97 [RRC2004] 86 X 18 02 22.58 -23 01 59.1           ~ 1 0
98 [RRC2004] 88 Y*O 18 02 22.759 -23 01 51.78           ~ 2 0
99 CXOM20 J180222.78-230018.5 X 18 02 22.78 -23 00 18.5           ~ 1 0
100 2MASS J18022285-2259354 TT* 18 02 22.8718425336 -22 59 35.442484944           ~ 4 0
101 CXOM20 J180222.90-230128.5 Y*O 18 02 22.922 -23 01 28.63           ~ 2 0
102 NGC 6514 147 Y*? 18 02 23.0573846112 -23 02 05.974579176           F3V 10 0
103 CXOM20 J180223.06-230125.3 Y*O 18 02 23.078 -23 01 25.34           ~ 2 0
104 V* V3791 Sgr Or* 18 02 23.0962503288 -23 01 44.572635120       15.15 13.06 ~ 4 0
105 EM* LkHA 123 Em* 18 02 23.13015 -23 01 59.9462   8.72 6.80 9.37   B1V 47 0
106 CXOM20 J180223.19-230023.6 Y*O 18 02 23.2049327688 -23 00 23.603079996           ~ 2 0
107 [RRC2004] 97 Y*O 18 02 23.228 -23 01 34.94         14.65 ~ 3 0
108 2MASS J18022322-2300122 Y*O 18 02 23.2298459928 -23 00 12.151259460           ~ 3 0
109 CXOM20 J180223.32-230311.3 Y*O 18 02 23.376 -23 03 11.30           ~ 2 0
110 CXOM20 J180223.41-230222.4 Y*O 18 02 23.3966691720 -23 02 22.294985208           ~ 2 0
111 CXOM20 J180223.41-230141.5 Y*O 18 02 23.405 -23 01 41.43           ~ 2 0
112 2MASS J18022351-2300230 Y*O 18 02 23.5125750360 -23 00 23.005014336           ~ 3 0
113 HD 164492 Y*O 18 02 23.5527520992 -23 01 50.999556180 6.49 7.49 6.80 7.52   O7.5Vz 230 0
114 2MASS J18022361-2303276 Y*O 18 02 23.6208999624 -23 03 27.548219772           ~ 2 0
115 2MASS J18022364-2300554 Y*O 18 02 23.65 -23 00 55.5           ~ 2 0
116 [RRC2004] 105 Y*O 18 02 23.6701297920 -23 01 57.241073208           ~ 2 0
117 HD 164492B sg* 18 02 23.7095503200 -23 01 45.155769456   8.0 12.06     B2Vnn 22 0
118 CXOM20 J180223.83-225939.0 Y*O 18 02 23.8298164152 -22 59 38.730724836           ~ 2 0
119 2MASS J18022394-2254307 Y*O 18 02 23.9593860936 -22 54 30.668764032           ~ 2 0
120 2MASS J18022398-2304191 Y*O 18 02 23.9977119528 -23 04 19.129424376           ~ 2 0
121 2MASS J18022419-2300366 Y*O 18 02 24.1869622320 -23 00 36.592976556           ~ 2 0
122 [RRC2004] 111 X 18 02 24.2699796960 -22 51 12.631324104           ~ 1 0
123 2MASS J18022428-2259268 Y*O 18 02 24.2963855160 -22 59 26.835374832           ~ 2 0
124 CXOM20 J180224.57-230020.7 Y*O 18 02 24.5917834104 -23 00 20.537590320           ~ 2 0
125 2MASS J18022462-2301035 Y*O 18 02 24.62160 -23 01 03.5616           ~ 3 0
126 SSTGLMC G007.0097-00.2542 Y*O 18 02 24.70680 -23 01 17.7204           ~ 13 0
127 2MASS J18022488-2255261 Y*O 18 02 24.8959337088 -22 55 26.160957948           ~ 2 0
128 2MASS J18022512-2302174 Y*O 18 02 25.1329683048 -23 02 17.401435944           ~ 2 0
129 CXOM20 J180225.17-225341.0 Y*O 18 02 25.1693124720 -22 53 40.891165116           ~ 2 0
130 SSTGLMA G007.0084-00.2571 Y*O 18 02 25.18968 -23 01 26.9004           ~ 4 0
131 CXOM20 J180225.35-230256.7 Y*O 18 02 25.329 -23 02 56.09           ~ 2 0
132 2MASS J18022536-2300362 Y*O 18 02 25.3707436224 -23 00 36.212114268           ~ 3 0
133 CXOM20 J180225.34-230355.5 Y*O 18 02 25.3954055040 -23 03 55.907633988           ~ 2 0
134 2MASS J18022544-2301394 Y*O 18 02 25.4501335368 -23 01 39.368089668           ~ 2 0
135 2MASS J18022563-2300567 Y*O 18 02 25.6371122640 -23 00 56.730181392           ~ 2 0
136 NGC 6514 148 Y*O 18 02 25.8632041824 -23 01 42.420957888       15.87   ~ 8 0
137 CXOM20 J180225.93-230011.6 Y*O 18 02 25.936 -23 00 11.39           ~ 2 0
138 2MASS J18022594-2300344 Y*O 18 02 25.9456811520 -23 00 34.420901976           ~ 2 0
139 2MASS J18022594-2258029 Y*O 18 02 25.9476010824 -22 58 03.017454924           ~ 2 0
140 CXOM20 J180225.99-225527.8 Y*O 18 02 25.9802575176 -22 55 27.438831336           ~ 2 0
141 CXOM20 J180225.99-230013.4 Y*O 18 02 25.9965959811 -23 00 13.231258445           ~ 3 0
142 2MASS J18022600-2302274 Y*O 18 02 26.0129171568 -23 02 27.381570792           ~ 2 0
143 CXOM20 J180226.09-230128.6 Y*O 18 02 26.098 -23 01 28.53           ~ 2 0
144 2MASS J18022648-2301557 Y*O 18 02 26.4896547360 -23 01 55.763969160           ~ 2 0
145 2MASS J18022685-2300142 Y*O 18 02 26.8602745728 -23 00 14.224879116           ~ 2 0
146 CXOM20 J180226.95-225107.9 Y*O 18 02 26.9642374824 -22 51 07.778764296           ~ 3 0
147 2MASS J18022712-2300509 Y*O 18 02 27.1347145848 -23 00 50.935262868           ~ 2 0
148 2MASS J18022717-2303333 Y*O 18 02 27.1863125232 -23 03 33.013944864           ~ 2 0
149 CXOM20 J180227.32-225937.7 Y*O 18 02 27.3357316392 -22 59 37.457375640           ~ 3 0
150 CXOM20 J180227.45-230413.7 X 18 02 27.45 -23 04 13.7           ~ 1 0
151 CXOM20 J180227.56-230020.3 Y*O 18 02 27.5685117240 -23 00 19.829149560           ~ 2 0
152 2MASS J18022797-2258566 Y*O 18 02 27.9786120552 -22 58 56.583122628           ~ 2 0
153 2MASSW J1802281-230142 TT* 18 02 28.0098751200 -23 01 42.632869836           ~ 3 0
154 CXOM20 J180228.13-230211.1 Y*O 18 02 28.1437660968 -23 02 10.957391124           ~ 2 0
155 2MASSI J1802284-230115 TT* 18 02 28.416 -23 01 13.98           ~ 3 0
156 CXOM20 J180228.41-225947.3 Y*O 18 02 28.4169328968 -22 59 47.101838928           ~ 2 0
157 CXOM20 J180228.44-225544.5 X 18 02 28.44 -22 55 44.5           ~ 1 0
158 CXOM20 J180228.52-230014.6 Y*O 18 02 28.508 -23 00 14.52           ~ 2 0
159 2MASS J18022851-2300378 Y*O 18 02 28.51152 -23 00 37.8540           ~ 5 0
160 2MASS J18022853-2251446 Y*O 18 02 28.5332149656 -22 51 44.629669548           ~ 3 0
161 2MASS J18022865-2303032 Y*O 18 02 28.6659375936 -23 03 03.197872980           ~ 3 0
162 CXOM20 J180228.66-230136.8 Y*O 18 02 28.7011855104 -23 01 36.797168928           ~ 2 0
163 2MASS J18022874-2259472 Y*O 18 02 28.7556373344 -22 59 47.255912448           ~ 2 0
164 2MASS J18022879-2259000 Y*O 18 02 28.8041690424 -22 58 59.940468264           ~ 2 0
165 2MASS J18022886-2302256 Y*O 18 02 28.8667016160 -23 02 25.538118576           ~ 3 0
166 HH 399 HH 18 02 28.9 -23 04 00           ~ 28 0
167 2MASS J18022912-2300404 Y*O 18 02 29.12712 -23 00 40.4244           ~ 2 0
168 2MASS J18022917-2252524 Y*O 18 02 29.17 -22 52 52.5           ~ 2 0
169 2MASS J18022935-2301014 Y*O 18 02 29.3614356960 -23 01 01.575868980           ~ 2 0
170 CXOM20 J180229.47-225914.7 Y*O 18 02 29.473 -22 59 14.67           ~ 2 0
171 CXOM20 J180229.53-225536.5 X 18 02 29.53 -22 55 36.5           ~ 1 0
172 CXOM20 J180229.60-225859.3 Y*O 18 02 29.598 -22 58 59.22           ~ 2 0
173 CXOM20 J180229.59-225654.4 Y*O 18 02 29.6008457064 -22 56 54.173906736           ~ 2 0
174 CXOU J180229.6-225010 Y*? 18 02 29.68 -22 50 12.5           ~ 2 0
175 CXOM20 J180229.79-225603.5 Y*O 18 02 29.7945275904 -22 56 03.291109152           ~ 3 0
176 CXOM20 J180230.03-230202.5 Y*O 18 02 30.024 -23 02 02.74           ~ 2 0
177 2MASS J18023014-2300394 Y*O 18 02 30.1502698728 -23 00 39.398866524           ~ 2 0
178 2MASS J18023019-2259499 Y*O 18 02 30.2012391048 -22 59 49.926320808           ~ 2 0
179 2MASSW J1802305-225929 TT* 18 02 30.3766121736 -22 59 28.808199384           ~ 5 0
180 2MASS J18023039-2301342 Y*O 18 02 30.3853600008 -23 01 34.353053040           ~ 4 0
181 CXOM20 J180230.47-224858.6 X 18 02 30.47 -22 48 58.6           ~ 1 0
182 2MASS J18023089-2253033 Y*O 18 02 30.9026141118 -22 53 03.454899916           ~ 2 0
183 CXOM20 J180230.93-230235.6 Y*O 18 02 30.9487927200 -23 02 35.212094520           ~ 4 0
184 CXOM20 J180230.98-230043.6 Y*O 18 02 30.9812997648 -23 00 43.403568768           ~ 3 0
185 2MASS J18023106-2300310 Y*O 18 02 31.0910597160 -23 00 31.387170852           ~ 2 0
186 CXOM20 J180231.20-230124.4 Y*O 18 02 31.2075433920 -23 01 24.127877316           ~ 2 0
187 CXOM20 J180231.22-230120.8 Y*O 18 02 31.2131252304 -23 01 20.463055716           ~ 2 0
188 CXOM20 J180231.55-230149.4 Y*O 18 02 31.5683330232 -23 01 49.105075584           ~ 2 0
189 [RRC2004] 176 * 18 02 31.660 -22 55 12.22           ~ 2 0
190 2MASS J18023169-2302166 Y*O 18 02 31.7026057728 -23 02 16.660683096           ~ 3 0
191 2MASS J18023180-2303337 Y*O 18 02 31.8123269976 -23 03 33.781405248           ~ 2 0
192 CXOM20 J180231.84-230024.9 X 18 02 31.84 -23 00 24.9           ~ 1 0
193 CXOM20 J180231.89-225802.0 Y*O 18 02 31.9080312000 -22 58 02.324703252           ~ 2 0
194 CXOM20 J180231.94-230024.7 X 18 02 31.94 -23 00 24.7           ~ 1 0
195 CXOM20 J180232.00-225359.8 Y*O 18 02 31.9915517256 -22 53 59.607289752           ~ 3 0
196 CXOM20 J180231.99-230240.4 Y*O 18 02 31.9978949184 -23 02 40.065743148           ~ 2 0
197 CXOM20 J180232.30-225927.9 X 18 02 32.30 -22 59 27.9           ~ 1 0
198 2MASS J18023235-2304543 Y*O 18 02 32.3575463688 -23 04 54.367708332           ~ 2 0
199 2MASS J18023243-2256142 Y*? 18 02 32.44 -22 56 14.2           ~ 2 0
200 2MASS J18023254-2259247 Y*O 18 02 32.6169242808 -22 59 24.427785516           ~ 3 0
201 CXOM20 J180232.61-230116.4 Y*O 18 02 32.6221222128 -23 01 16.173235308           ~ 2 0
202 CXOM20 J180232.63-225937.6 Y*O 18 02 32.622 -22 59 37.64           ~ 2 0
203 [RRC2004] 187 X 18 02 32.6352788760 -22 53 25.566393984           ~ 1 0
204 CXOM20 J180232.67-225949.5 Y*O 18 02 32.6756727408 -22 59 49.258765536           ~ 2 0
205 CXOM20 J180232.68-225946.3 Y*O 18 02 32.690 -22 59 46.32           ~ 2 0
206 CXOM20 J180232.74-230046.7 Y*O 18 02 32.7465377280 -23 00 46.567231128           ~ 2 0
207 CXOM20 J180232.79-225920.5 Y*O 18 02 32.779 -22 59 20.51           ~ 2 0
208 2MASS J18023280-2304210 Y*O 18 02 32.80008 -23 04 21.0540           ~ 3 0
209 CXOM20 J180233.02-230310.8 X 18 02 33.02 -23 03 10.8           ~ 1 0
210 2MASS J18023302-2255474 Y*O 18 02 33.0346734720 -22 55 47.302075632           ~ 2 0
211 CXOM20 J180233.16-230237.4 Y*O 18 02 33.1493106216 -23 02 37.654831752           ~ 2 0
212 CXOM20 J180233.34-230111.3 Y*O 18 02 33.3668695704 -23 01 11.452468440           ~ 2 0
213 CXOM20 J180233.53-230117.4 Y*O 18 02 33.5184165936 -23 01 17.344920396           ~ 2 0
214 [RRC2004] 202 Y*? 18 02 33.67 -22 52 57.4           ~ 2 0
215 CXOM20 J180233.67-225954.3 Y*O 18 02 33.6870916368 -22 59 54.433489308           ~ 2 0
216 2MASS J18023377-2255375 Y*O 18 02 33.774 -22 55 37.43           ~ 2 0
217 2MASS J18023377-2258410 Y*O 18 02 33.7839981768 -22 58 40.928198376           ~ 2 0
218 2MASS J18023384-2253227 Y*O 18 02 33.8460855696 -22 53 22.808946912           ~ 2 0
219 CXOM20 J180233.91-225952.6 Y*O 18 02 33.9215588760 -22 59 52.707628248           ~ 2 0
220 2MASS J18023404-2303176 Y*O 18 02 34.0470384504 -23 03 17.568889776           ~ 2 0
221 2MASS J18023404-2250136 Y*O 18 02 34.0471777632 -22 50 13.623213804           ~ 4 0
222 CXOM20 J180234.33-230115.4 Y*O 18 02 34.3312096200 -23 01 15.339289944           ~ 2 0
223 2MASS J18023445-2258107 Y*O 18 02 34.4601939792 -22 58 10.682867640           ~ 3 1
224 2MASS J18023450-2259380 Y*O 18 02 34.5128697744 -22 59 37.925475036           ~ 3 0
225 2MASS J18023456-2300307 Y*O 18 02 34.5752441664 -23 00 30.761351748           ~ 2 0
226 CXOM20 J180234.70-225125.3 Y*O 18 02 34.7251589016 -22 51 24.319689876           ~ 2 0
227 CXOM20 J180234.91-230148.7 Y*O 18 02 34.9305735984 -23 01 48.734836032           ~ 2 0
228 2MASS J18023492-2300466 Y*? 18 02 34.9337394000 -23 00 46.580914260           ~ 2 0
229 CXOM20 J180235.05-230052.6 Y*O 18 02 35.0421090696 -23 00 52.452328320           ~ 2 0
230 2MASS J18023526-2301024 Y*O 18 02 35.2640477496 -23 01 02.437393476           ~ 3 0
231 2MASS J18023533-2300094 Y*O 18 02 35.3355149400 -23 00 09.347396868           ~ 3 0
232 HD 313596 Y*O 18 02 35.5530506496 -22 59 55.765950216   10.60 10.49     B8 5 0
233 CXOM20 J180235.74-230258.6 Y*O 18 02 35.7315432912 -23 02 58.521239628           ~ 2 0
234 2MASS J18023594-2259468 Y*O 18 02 35.9584571880 -22 59 47.198661396           ~ 2 0
235 2MASS J18023597-2301408 Y*O 18 02 35.9772824232 -23 01 40.780564392           ~ 4 0
236 CXOM20 J180236.07-224939.5 X 18 02 36.07 -22 49 39.5           ~ 1 0
237 CXOM20 J180236.09-225919.9 Y*O 18 02 36.0803246328 -22 59 19.666570920           ~ 2 0
238 CXOM20 J180236.11-230131.9 Y*O 18 02 36.1253469696 -23 01 31.839361788           ~ 2 0
239 [RRC2004] 226 X 18 02 36.2665906200 -22 57 33.215747940           ~ 1 0
240 CXOM20 J180236.45-225959.6 Y*O 18 02 36.4681327824 -22 59 59.687401920           ~ 2 0
241 2MASSI J1802367-225804 TT* 18 02 36.7094607240 -22 58 04.254028032           ~ 4 0
242 [RRC2004] 231 * 18 02 36.8041830408 -23 04 15.118792752           ~ 1 0
243 CXOM20 J180236.81-230024.0 Y*O 18 02 36.8057200680 -23 00 24.134929344           ~ 2 0
244 2MASS J18023681-2304013 Y*O 18 02 36.82 -23 04 01.3           ~ 2 0
245 2MASS J18023716-2247423 Y*O 18 02 37.1827520184 -22 47 42.245286756           ~ 2 0
246 2MASS J18023732-2301041 Y*O 18 02 37.3246673064 -23 01 04.121194692           ~ 2 0
247 [RRC2004] 234 X 18 02 37.3609500480 -23 00 48.350636244           ~ 1 0
248 2MASSW J1802379-230211 Y*O 18 02 37.8105688440 -23 02 11.703967512           ~ 3 0
249 2MASS J18023825-2258547 Y*O 18 02 38.2575960864 -22 58 54.654181032           ~ 2 0
250 CXOM20 J180238.85-225006.1 X 18 02 38.85 -22 50 06.1           ~ 1 0
251 CXOM20 J180238.94-225021.0 X 18 02 38.94 -22 50 21.0           ~ 1 0
252 2MASS J18023898-2259509 Y*O 18 02 38.9826592008 -22 59 50.908837740           ~ 2 0
253 CXOM20 J180239.07-224822.8 X 18 02 39.18 -22 48 23.2           ~ 1 0
254 2MASSI J1802395-230343 TT* 18 02 39.5770397280 -23 03 43.526377692           ~ 4 0
255 CXOM20 J180239.94-230012.9 Y*O 18 02 39.937 -23 00 12.87           ~ 2 0
256 2MASS J18024012-2301457 Y*O 18 02 40.1359109112 -23 01 45.708014712           ~ 2 0
257 CXOM20 J180240.18-230404.5 X 18 02 40.18 -23 04 04.5           ~ 1 0
258 CXOM20 J180240.21-224834.8 X 18 02 40.21 -22 48 34.8           ~ 1 0
259 2MASS J18024041-2257532 Y*O 18 02 40.4182234680 -22 57 53.196572160           ~ 2 0
260 [RRC2004] 248 X 18 02 40.6352151888 -22 55 17.896565856           ~ 1 0
261 CXOM20 J180240.61-230128.4 Y*O 18 02 40.642 -23 01 28.29           ~ 2 0
262 2MASS J18024086-2300543 Y*O 18 02 40.87 -23 00 54.4           ~ 2 0
263 2MASS J18024119-2249048 Y*O 18 02 41.2165269408 -22 49 04.641178080           ~ 4 0
264 2MASS J18024125-2301139 Y*O 18 02 41.26 -23 01 14.0           ~ 2 0
265 CXOM20 J180241.37-225742.4 Y*O 18 02 41.369 -22 57 42.29           ~ 2 0
266 CXOM20 J180241.50-225820.8 X 18 02 41.50 -22 58 20.8           ~ 1 0
267 2MASS J18024198-2300569 Y*O 18 02 41.98 -23 00 57.0           ~ 2 0
268 M 20 OpC 18 02 42 -22 58.3           ~ 434 1
269 SSTGLMC G007.0928-00.2842 X 18 02 42.19 -22 57 50.5           ~ 1 0
270 CXOM20 J180242.36-230435.8 Y*O 18 02 42.3980318040 -23 04 35.805184752           ~ 3 0
271 2MASS J18024283-2258357 Y*O 18 02 42.8428182120 -22 58 35.839590492           ~ 2 0
272 2MASS J18024300-2303128 Y*O 18 02 43.004 -23 03 12.86           ~ 5 0
273 MPCM J180243.12-225537.7 * 18 02 43.0076148024 -22 55 38.717047920           ~ 2 0
274 CXOM20 J180243.20-225435.4 Y*O 18 02 43.219 -22 54 36.10           ~ 2 0
275 2MASS J18024345-2301352 Y*O 18 02 43.4671779192 -23 01 35.247054288           ~ 4 0
276 2MASS J18024356-2257357 Y*O 18 02 43.5669264336 -22 57 35.703954612           ~ 2 0
277 CXOM20 J180244.04-225715.6 X 18 02 44.04 -22 57 15.6           ~ 1 0
278 2MASS J18024415-2302454 Y*O 18 02 44.1598656024 -23 02 45.371498496           ~ 4 0
279 CXOM20 J180244.76-225815.4 X 18 02 44.76 -22 58 15.4           ~ 1 0
280 CXOM20 J180244.78-225951.9 Y*O 18 02 44.7724570824 -22 59 51.975213972           ~ 2 0
281 2MASS J18024547-2259183 Y*O 18 02 45.4785031584 -22 59 18.326340132           ~ 2 0
282 CXOM20 J180245.46-225837.4 X 18 02 45.49 -22 58 38.4           ~ 1 0
283 CXOM20 J180245.74-225944.2 Y*O 18 02 45.7500806016 -22 59 43.950856488           ~ 2 0
284 CXOM20 J180245.99-225719.6 X 18 02 45.99 -22 57 19.6           ~ 1 0
285 2MASS J18024661-2250329 Y*O 18 02 46.6105292304 -22 50 32.865830376           ~ 2 0
286 [RRC2004] 272 X 18 02 46.9076492208 -22 53 23.552483928           ~ 1 0
287 CXOM20 J180247.20-225502.4 Y*O 18 02 47.2720415784 -22 55 02.345184372           ~ 2 0
288 2MASS J18024758-2248205 Y*O 18 02 47.5911614736 -22 48 20.667587544           ~ 4 0
289 2MASS J18024769-2258393 Y*O 18 02 47.6982189624 -22 58 39.328286520           ~ 2 0
290 2MASS J18024782-2249110 Y*O 18 02 47.82 -22 49 11.1           ~ 2 0
291 CXOM20 J180247.82-225942.2 Y*O 18 02 47.8779186984 -22 59 41.957467620           ~ 4 0
292 CXOM20 J180248.38-230030.6 Y*O 18 02 48.366 -23 00 31.31           ~ 2 0
293 2MASS J18024864-2259324 Y*O 18 02 48.6539407656 -22 59 32.452972980           ~ 3 0
294 CXOM20 J180248.70-225417.6 Y*O 18 02 48.663 -22 54 18.19           ~ 2 0
295 CXOM20 J180248.75-225157.1 X 18 02 48.75 -22 51 57.1           ~ 1 0
296 2MASSI J1802490-225656 TT* 18 02 49.02 -22 56 57.4           ~ 2 0
297 2MASS J18024918-2259457 Y*O 18 02 49.1859850056 -22 59 45.703433112           ~ 6 0
298 CXOM20 J180249.24-225018.7 Y*O 18 02 49.2816341688 -22 50 18.027579120           ~ 2 0
299 2MASS J18024939-2248340 Y*O 18 02 49.4183167752 -22 48 33.526107540           ~ 3 0
300 [RRC2004] 286 * 18 02 49.6459853616 -22 48 55.319633892           ~ 1 0
301 2MASS J18024986-2258497 Y*O 18 02 49.8620252928 -22 58 49.776036168           ~ 2 0
302 [RRC2004] 288 X 18 02 50.1147357072 -23 00 13.408745544           ~ 1 0
303 CXOM20 J180250.36-224741.0 X 18 02 50.36 -22 47 41.0           ~ 1 0
304 2MASS J18025044-2248501 Y*O 18 02 50.4404191704 -22 48 50.113694160           ~ 5 0
305 CXOM20 J180251.37-230207.4 X 18 02 51.37 -23 02 07.4           ~ 1 0
306 2MASS J18025172-2302340 Y*O 18 02 51.7234506360 -23 02 34.067529996           ~ 3 0
307 CXOM20 J180252.27-224948.8 X 18 02 52.27 -22 49 48.8           ~ 1 0
308 CXOM20 J180253.09-230339.0 X 18 02 53.09 -23 03 39.0           ~ 1 0
309 [RRC2004] 295 Y*? 18 02 54.90 -22 58 22.1           ~ 2 0
310 ATO J270.7378-22.9055 Y*O 18 02 57.0917282952 -22 54 19.912866984           ~ 3 0
311 2MASS J18025756-2302543 Y*O 18 02 57.56 -23 02 54.3           ~ 2 0
312 CXOM20 J180257.83-230046.4 X 18 02 57.83 -23 00 46.4           ~ 1 0
313 CXOM20 J180258.06-225602.4 X 18 02 58.06 -22 56 02.4           ~ 1 0
314 [RRC2004] 300 X 18 03 00.1640246609 -22 52 53.704550901           ~ 1 0
315 [RRC2004] 301 * 18 03 01.5577430760 -23 00 55.005557364           ~ 1 0
316 CXOM20 J180302.19-230248.7 X 18 03 02.19 -23 02 48.7           ~ 1 0
317 [RRC2004] 303 * 18 03 03.3569213352 -23 00 18.421922016           ~ 1 0
318 2MASS J18030383-2301059 * 18 03 03.8345233512 -23 01 05.960076060           ~ 2 0

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