2002ApJ...567..423K

Query : 2002ApJ...567..423K

2002ApJ...567..423K - Astrophys. J., 567, 423-433 (2002/March-1)

Chandra observations of high-mass young stellar objects in the Monoceros R2 molecular cloud.

KOHNO M., KOYAMA K. and HAMAGUCHI K.

Abstract (from CDS):

We observed the Monoceros R2 molecular cloud with the ACIS-I array on board the Chandra X-Ray Observatory. From the central 3'.2x3'.2 region, we detect 154 sources above the detection limit of ∼5x10–16 ergs s^ -1^ cm^ -2^ with a 100 ks exposure. About 85% of the X-ray sources are identified with an infrared counterpart, including four high-mass stars in the zero-age main-sequence (ZAMS) and/or pre-main-sequence (PMS) phase. The X-ray spectra of the high-mass ZAMS and PMS stars are represented by a thin thermal plasma model of a temperature above ∼2 keV. The X-rays are time variable and exhibit rapid flares. This high-temperature plasma and flaring activity is similar to that seen in low-mass PMS stars and is contrary to the behavior observed in high-mass main-sequence stars.The X-ray luminosity increases as the intrinsic K-band flux increases. However, the X-ray luminosity saturates at a level of ∼1031 ergs s–1. We conclude that high-mass ZAMS and PMS stars emit X-rays, possibly because of magnetic activity such as that of low-mass stars.

Abstract Copyright: ∼

Journal keyword(s): Stars: Early-Type - Stars: Individual: Constellation Name: Monoceros R2 - Stars: Pre-Main-Sequence - X-Rays: Stars

VizieR on-line data: <Available at CDS (J/ApJ/567/423): table1.dat>

Nomenclature: Table 1, col(1): [KKH2002] NNN (Nos 1-154).

Errata: erratum vol. 580, p. 626 (2002)

Simbad objects: 157

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Number of rows : 157
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 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
2 ALMA J053514.3589-052232.733 Y*O 05 35 14.3580 -05 22 32.726           ~ 111 0
3 * tet01 Ori E Or* 05 35 15.7721814864 -05 23 09.889316700           G2IV 104 0
4 * tet01 Ori A Ae* 05 35 15.8254015008 -05 23 14.334699480 5.87 6.75 6.73 6.42 6.21 B0V 508 0
5 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1479 1
6 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
7 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
8 * tet01 Ori D Y*O 05 35 17.2574479992 -05 23 16.570738104 6.08 6.79 6.70 6.40 6.20 B1.5Vp 340 0
9 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
10 2MASS J06074056-0622458 * 06 07 40.57 -06 22 45.8           ~ 3 0
11 [NIT2003] 77 X 06 07 40.63 -06 22 59.2           ~ 2 0
12 [CMD97] 3 * 06 07 40.87 -06 21 17.2           ~ 3 0
13 2MASS J06074089-0624048 Y*O 06 07 40.8901962504 -06 24 04.808759508           G2: 4 0
14 [CMD97] 9 * 06 07 40.96 -06 24 09.9           ~ 2 0
15 2MASS J06074108-0624087 Y*O 06 07 41.088 -06 24 08.70           ~ 4 0
16 2MASS J06074141-0622124 Y*O 06 07 41.412 -06 22 12.42           ~ 4 0
17 2MASS J06074216-0622552 Y*O 06 07 42.1673926776 -06 22 55.270586676           G8: 5 0
18 2MASS J06074223-0623106 * 06 07 42.23 -06 23 10.6           ~ 3 0
19 [CMD97] 29 * 06 07 42.27 -06 22 53.6           ~ 3 0
20 [CMD97] 32 * 06 07 42.40 -06 23 49.8           ~ 3 0
21 [CMD97] 34 * 06 07 42.43 -06 23 14.6           ~ 2 0
22 2MASS J06074273-0623072 Y*O 06 07 42.734 -06 23 07.29           ~ 4 0
23 [CMD97] 43 * 06 07 42.84 -06 23 11.5           ~ 3 0
24 [CMD97] 47 * 06 07 42.96 -06 22 48.3           ~ 2 0
25 2MASS J06074299-0623215 Y*O 06 07 42.9894700896 -06 23 21.458281380           ~ 4 0
26 2MASS J06074302-0624101 Y*O 06 07 43.029 -06 24 10.20           ~ 4 0
27 2MASS J06074302-0622336 Y*O 06 07 43.029 -06 22 33.63           ~ 4 0
28 2MASS J06074309-0623567 * 06 07 43.10 -06 23 56.8           ~ 3 0
29 2MASS J06074311-0622062 * 06 07 43.11 -06 22 06.3           ~ 3 0
30 [NIT2003] 102 X 06 07 43.23 -06 22 58.0           ~ 2 0
31 [CMD97] 66 * 06 07 43.54 -06 22 44.7           ~ 3 0
32 [CMD97] 65 * 06 07 43.58 -06 23 21.8           ~ 3 0
33 [NIT2003] 107 IR 06 07 43.58 -06 22 51.7           ~ 4 0
34 [NIT2003] 110 X 06 07 43.69 -06 23 01.6           ~ 2 0
35 2MASS J06074370-0624217 * 06 07 43.70 -06 24 21.8           ~ 3 0
36 JCMTSE J060743.5-062308 * 06 07 43.71 -06 23 10.7           ~ 3 0
37 [CMD97] 79 * 06 07 43.72 -06 22 46.8           ~ 3 0
38 [CMD97] 86 * 06 07 43.86 -06 23 27.1           ~ 2 0
39 [CMD97] 87 * 06 07 43.92 -06 23 13.3           ~ 3 0
40 [KKH2002] 34 X 06 07 43.96 -06 23 27.1           ~ 1 0
41 [CMD97] 93 * 06 07 44.14 -06 24 20.5           ~ 3 0
42 [CMD97] 94 * 06 07 44.23 -06 22 30.7           ~ 3 0
43 2MASS J06074426-0623256 Y*O 06 07 44.268 -06 23 25.68           K0: 5 0
44 [GMM2009] Mon R2 116 Y*O 06 07 44.32 -06 24 22.4           ~ 3 0
45 [CMD97] 103 * 06 07 44.46 -06 22 41.3           ~ 3 0
46 2MASS J06074454-0623214 * 06 07 44.55 -06 23 21.4           ~ 3 0
47 [CMD97] 107 * 06 07 44.60 -06 23 15.5           ~ 2 0
48 [CMD97] 116 * 06 07 44.81 -06 23 35.9           ~ 3 0
49 2MASX J06074488-0624073 * 06 07 44.886 -06 24 07.38           ~ 2 0
50 2MASS J06074496-0622401 * 06 07 44.97 -06 22 40.1           ~ 3 0
51 [CMD97] 131 * 06 07 45.22 -06 23 28.3           M0: 3 0
52 [CMD97] 132 * 06 07 45.23 -06 23 03.3           ~ 2 0
53 NAME Mon R2 IRS 4 * 06 07 45.25 -06 23 19.9           ~ 19 0
54 [NIT2003] 138 X 06 07 45.27 -06 22 47.2           ~ 2 0
55 2MASS J06074528-0623350 Y*O 06 07 45.284 -06 23 35.01           ~ 4 0
56 [CMD97] 142 * 06 07 45.39 -06 23 08.5           ~ 3 0
57 [CMD97] 143 * 06 07 45.42 -06 22 33.7           ~ 3 0
58 [CMD97] 147 * 06 07 45.47 -06 23 16.5           ~ 3 0
59 2MASS J06074548-0621286 Y*O 06 07 45.4773784536 -06 21 28.588821372           ~ 4 0
60 [CMD97] 150 * 06 07 45.57 -06 22 49.9           ~ 3 0
61 [CMD97] 153 * 06 07 45.58 -06 22 50.5           ~ 2 0
62 NAME Mon R2 IRS 5 * 06 07 45.6 -06 22 40           ~ 17 0
63 [CMD97] 160 * 06 07 45.61 -06 22 54.6           ~ 2 0
64 [CMD97] 167 * 06 07 45.66 -06 22 49.7           ~ 2 0
65 [CMD97] 169 * 06 07 45.69 -06 23 00.4           ~ 3 0
66 [KKH2002] 66 X 06 07 45.70 -06 22 55.3           ~ 1 0
67 NAME Mon R2 IRS 2 * 06 07 45.83 -06 22 53.5           B0 122 0
68 GSC 04795-01568 Or* 06 07 45.8549579952 -06 21 46.729255536           ~ 7 0
69 [CMD97] 184 * 06 07 45.88 -06 21 54.3     12.86     F6: 3 0
70 [NIT2003] 160 X 06 07 45.90 -06 24 00.9           ~ 2 0
71 [CMD97] 192 * 06 07 45.94 -06 23 32.6           ~ 3 0
72 [AW90] cS IR 06 07 45.99 -06 22 25.7           ~ 3 0
73 [CMD97] 200 * 06 07 46.00 -06 23 43.7           ~ 2 0
74 [KKH2002] 73 X 06 07 46.00 -06 22 25.7           ~ 1 0
75 [CMD97] 199 * 06 07 46.01 -06 23 01.9           ~ 3 0
76 [NIT2003] 166 IR 06 07 46.01 -06 22 24.0           ~ 4 0
77 [CMD97] 203 * 06 07 46.04 -06 23 50.2           ~ 3 0
78 CXOU J060746.1-062205 Y*O 06 07 46.116 -06 22 05.64           ~ 4 0
79 [CMD97] 210 * 06 07 46.12 -06 23 00.7           ~ 2 0
80 2MASS J06074615-0623046 Y*O 06 07 46.158 -06 23 04.61           ~ 9 0
81 [CMD97] 211 * 06 07 46.16 -06 21 30.7           ~ 3 0
82 [BEB76] IRS 1NE * 06 07 46.18 -06 23 01.9     14.41     K3: 8 0
83 NAME Mon R2 IRS 1 cor 06 07 46.20 -06 23 09.5           B0 65 0
84 [NIT2003] 171 X 06 07 46.22 -06 23 10.6           ~ 2 0
85 [CMD97] 223 * 06 07 46.34 -06 23 35.4           ~ 3 0
86 [CMD97] 229 * 06 07 46.37 -06 22 43.1           ~ 3 0
87 [CMD97] 228 * 06 07 46.39 -06 22 24.5           ~ 3 0
88 [CMD97] 237 * 06 07 46.51 -06 23 30.2           ~ 2 0
89 [CMD97] 235 * 06 07 46.54 -06 23 26.7           ~ 3 0
90 [CMD97] 241 * 06 07 46.56 -06 22 52.6           ~ 3 0
91 [CMD97] 238 * 06 07 46.57 -06 22 19.0           ~ 3 0
92 CXOU J060746.5-062237 Y*O 06 07 46.598 -06 22 37.53           ~ 7 0
93 2MASS J06074660-0622335 * 06 07 46.60344 -06 22 33.5208           ~ 5 0
94 [CMD97] 245 * 06 07 46.63 -06 23 30.0           ~ 3 0
95 [NIT2003] 183 IR 06 07 46.68 -06 23 12.9           ~ 4 0
96 [CMD97] 249 * 06 07 46.72 -06 22 58.0           ~ 2 0
97 [CMD97] 250 * 06 07 46.84 -06 23 08.0           ~ 3 0
98 2MASS J06074690-0624166 Y*O 06 07 46.904 -06 24 16.67           ~ 4 0
99 [CMD97] 260 * 06 07 47.04 -06 21 26.6           ~ 2 0
100 2MASS J06074710-0623338 Y*O 06 07 47.1036918072 -06 23 33.844133076           M0: 9 0
101 [CMD97] 263 * 06 07 47.12 -06 21 28.3           ~ 2 0
102 2MASS J06074717-0622313 * 06 07 47.17824 -06 22 31.3752           ~ 6 0
103 2MASS J06074732-0623473 Y*O 06 07 47.3182305336 -06 23 47.307896268           ~ 5 0
104 2MASS J06074734-0621519 Y*O 06 07 47.346 -06 21 51.97           ~ 4 0
105 [CMD97] 273 * 06 07 47.48 -06 22 18.7           ~ 3 0
106 2MASS J06074750-0623362 * 06 07 47.51 -06 23 36.2           ~ 3 0
107 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
108 2MASS J06074766-0623589 * 06 07 47.6612166216 -06 23 58.905847968           M1: 3 0
109 2MASS J06074766-0624200 * 06 07 47.67 -06 24 20.0           ~ 3 0
110 [BEB76] IRS 3E * 06 07 47.675 -06 22 55.23           ~ 6 0
111 [CMD97] 283 * 06 07 47.72 -06 23 11.9           ~ 3 0
112 [CMD97] 284 * 06 07 47.77 -06 21 36.9           ~ 3 0
113 2MASS J06074779-0624100 * 06 07 47.80 -06 24 10.0           ~ 2 0
114 [CMD97] 290 * 06 07 47.80 -06 23 30.9           ~ 3 0
115 NAME Mon R2 IRS 3 Y*O 06 07 47.8 -06 22 55           ~ 149 0
116 [KKH2002] 114 X 06 07 47.81 -06 23 30.9           ~ 1 0
117 [BEB76] IRS 3SW IR 06 07 47.81 -06 22 56.6           ~ 2 0
118 [CMD97] 287 * 06 07 47.84 -06 21 45.1           ~ 3 0
119 NAME Mon R2 IRS 3NE Y*O 06 07 47.87 -06 22 55.5           ~ 12 0
120 [CMD97] 292 * 06 07 47.88 -06 21 41.9           ~ 3 0
121 2CXO J060748.0-062230 * 06 07 48.03 -06 22 30.8           ~ 11 0
122 2MASS J06074806-0622393 * 06 07 48.0613284816 -06 22 39.322692516           ~ 6 0
123 [NIT2003] 214 X 06 07 48.07 -06 21 22.6           ~ 2 0
124 [NIT2003] 215 X 06 07 48.09 -06 23 33.0           ~ 2 0
125 [CMD97] 310 * 06 07 48.35 -06 23 22.4           ~ 3 0
126 2MASS J06074860-0621319 * 06 07 48.60 -06 21 31.9           ~ 3 0
127 [CMD97] 320 * 06 07 48.64 -06 23 40.5           ~ 3 0
128 [CMD97] 323 * 06 07 48.69 -06 22 27.4           ~ 3 0
129 2MASS J06074870-0624065 Y*O 06 07 48.70 -06 24 06.6           ~ 4 0
130 [CMD97] 328 * 06 07 48.83 -06 22 21.8           ~ 2 0
131 [CMD97] 336 * 06 07 49.07 -06 24 22.7     19.03     M1: 3 0
132 [CMD97] 334 * 06 07 49.07 -06 22 17.7           ~ 2 0
133 2MASS J06074907-0621396 Y*O 06 07 49.0715750688 -06 21 39.551076036           M2e 5 0
134 [NIT2003] 233 X 06 07 49.37 -06 23 54.3           ~ 2 0
135 2MASS J06074965-0623227 * 06 07 49.65 -06 23 22.8           ~ 3 0
136 2MASS J06074969-0621425 Y*O 06 07 49.6952288664 -06 21 42.537973824           ~ 5 0
137 2MASS J06074985-0621139 Y*O 06 07 49.8555724776 -06 21 13.897031040           ~ 4 0
138 [CMD97] 352 * 06 07 49.93 -06 22 10.8           ~ 2 0
139 2MASS J06075000-0623199 * 06 07 50.0042395704 -06 23 19.928750352           ~ 3 0
140 [CMD97] 354 * 06 07 50.06 -06 22 36.0           ~ 3 0
141 [CMD97] 355 * 06 07 50.35 -06 23 46.9           ~ 2 0
142 [CMD97] 358 * 06 07 50.43 -06 24 05.0           ~ 3 0
143 [CMD97] 361 * 06 07 50.57 -06 24 01.9           ~ 2 0
144 2MASS J06075059-0623284 * 06 07 50.60 -06 23 28.4           ~ 3 0
145 2MASS J06075073-0623231 * 06 07 50.74 -06 23 23.1           ~ 2 0
146 [CMD97] 364 * 06 07 51.00 -06 23 00.0           ~ 3 0
147 2MASS J06075107-0622236 * 06 07 51.07 -06 22 23.6           ~ 2 0
148 2MASS J06075142-0621442 * 06 07 51.4244250768 -06 21 44.276402916           ~ 3 0
149 2MASS J06075171-0623181 Y*O 06 07 51.716 -06 23 18.19           ~ 4 0
150 2MASS J06075178-0621297 Y*O 06 07 51.7997803728 -06 21 29.875620708           M0: 4 0
151 [CMD97] 378 * 06 07 52.17 -06 21 17.7           ~ 3 0
152 2MASS J06075228-0621384 Y*O 06 07 52.2835356168 -06 21 38.444796936           ~ 4 0
153 2MASS J06075230-0621179 Em* 06 07 52.3163010873 -06 21 17.999888891     17.22     K2: 6 0
154 2MASS J06075232-0623467 Y*O 06 07 52.3299729072 -06 23 46.809351420           ~ 4 0
155 2MASS J06075241-0622578 * 06 07 52.4113458696 -06 22 57.803035944           ~ 4 0
156 2MASS J06075291-0623276 * 06 07 52.9150474224 -06 23 27.541863960           M3.5: 3 0
157 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0

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