2003MNRAS.346.1143B

Query : 2003MNRAS.346.1143B

2003MNRAS.346.1143B - Mon. Not. R. Astron. Soc., 346, 1143-1150 (2003/December-3)

On the nature of Collinder 121: insights from the low-mass pre-main sequence.

BURNINGHAM B., NAYLOR T., JEFFRIES R.D. and DEVEY C.R.

Abstract (from CDS):

We present a VI photometric catalogue towards the open cluster Cr 121. XMM-Newton and ROSAT data are used to discover a low-mass pre-main sequence (PMS) along this sightline. de Zeeuw et al. have identified Cr 121 as a moving group, using Hipparcos data, at a distance of 592 pc; we reject the scenario that these low-mass PMS stars are associated with that association. By considering the higher mass main sequence stellar membership of the groups along this sightline, the density of low-mass PMS stars and their age spread we argue that the low-mass PMS stars are associated with a young, compact cluster at a distance of 1050 pc. This is consistent with Collinder's original description of Cr 121, and we argue that this distant compact cluster should retain its original designation. The moving group detected by de Zeeuw et al. resembles a foreground association and we agree with Eggen that this should be called CMa OB2.

This study demonstrates that although the de Zeeuw et al. census of OB associations is an invaluable resource for studying local star formation, it must be interpreted in the context of other data when considering structure over distances of the same order as the limits of the Hipparcos parallaxes.


Abstract Copyright: 2003 RAS

Journal keyword(s): techniques: photometric - stars: formation - stars: low-mass, brown dwarfs - open clusters and associations: Cr 121 - open clusters and associations: CMa OB 2 - X-rays: stars

VizieR on-line data: <Available at CDS (J/MNRAS/346/1143): table1.dat table2.dat table3.dat>

Nomenclature: Table 1: Cl* Collinder 121 BNJ N-NNNN N=27502. Table 2: [BNJ2003] XMM NNN N=110 among (Nos 1-152), [BNJ2003] XMM NNNs N=28 among (Nos 4s-118s). Table 3: [BNJ2003] ROSAT NN N=13 among (Nos 1-39).

Simbad objects: 153

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Number of rows : 153
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 [BNJ2003] XMM 20s * 06 52 59.6102447904 -23 51 31.748399280           ~ 1 0
2 [BNJ2003] ROSAT 1 X 06 53 01.200 -23 51 21.00           ~ 1 0
3 [BNJ2003] XMM 26s X 06 53 01.880 -23 51 34.37           ~ 1 0
4 [BNJ2003] XMM 27s X 06 53 05.340 -23 48 50.36           ~ 1 0
5 [BNJ2003] ROSAT 2 X 06 53 12.800 -23 53 53.00           ~ 1 0
6 [BNJ2003] ROSAT 3 X 06 53 13.200 -23 52 31.00           ~ 1 0
7 [BNJ2003] XMM 9 X 06 53 13.220 -24 04 39.28           ~ 1 0
8 [BNJ2003] XMM 4s X 06 53 14.110 -23 51 17.27           ~ 1 0
9 [BNJ2003] XMM 54s X 06 53 18.100 -23 54 05.62           ~ 1 0
10 [BNJ2003] XMM 79 X 06 53 18.300 -23 54 16.20           ~ 1 0
11 [BNJ2003] XMM 7s X 06 53 19.020 -23 49 26.23           ~ 1 0
12 [BNJ2003] ROSAT 5 X 06 53 19.600 -24 06 01.00           ~ 1 0
13 [BNJ2003] XMM 107 X 06 53 22.540 -23 55 46.17           ~ 1 0
14 [BNJ2003] XMM 69 X 06 53 22.800 -24 05 38.62           ~ 1 0
15 [BNJ2003] XMM 84 X 06 53 23.880 -23 58 36.96           ~ 1 0
16 2MASS J06532648-2351384 X 06 53 26.4851007624 -23 51 38.499633612           ~ 1 0
17 [BNJ2003] ROSAT 8 X 06 53 28.800 -24 09 15.00           ~ 1 0
18 [BNJ2003] XMM 18 X 06 53 29.110 -24 06 15.53           ~ 1 0
19 [BNJ2003] XMM 126 X 06 53 32.860 -24 02 31.17           ~ 1 0
20 [BNJ2003] XMM 56 X 06 53 32.950 -24 03 21.56           ~ 1 0
21 [BNJ2003] XMM 40 X 06 53 34.960 -24 03 29.98           ~ 1 0
22 [BNJ2003] XMM 82s X 06 53 39.770 -23 54 48.09           ~ 1 0
23 [BNJ2003] XMM 114 * 06 53 39.9021279096 -23 49 58.147991040           ~ 1 0
24 [BNJ2003] XMM 24s X 06 53 40.830 -23 53 27.75           ~ 1 0
25 [BNJ2003] XMM 96 X 06 53 41.190 -23 53 23.04           ~ 1 0
26 [BNJ2003] XMM 29 X 06 53 41.410 -24 07 23.35           ~ 1 0
27 [BNJ2003] XMM 36 X 06 53 42.820 -24 02 33.62           ~ 1 0
28 [BNJ2003] XMM 38 X 06 53 43.220 -24 01 00.01           ~ 1 0
29 2MASS J06534410-2356339 * 06 53 44.1126204216 -23 56 33.912139164           ~ 2 0
30 [BNJ2003] XMM 35 X 06 53 44.630 -23 56 03.81           ~ 1 0
31 [BNJ2003] XMM 38s X 06 53 45.570 -23 54 48.05           ~ 1 0
32 [BNJ2003] XMM 109 X 06 53 45.900 -24 00 07.87           ~ 1 0
33 [BNJ2003] ROSAT 11 X 06 53 46.100 -24 07 17.00           ~ 1 0
34 [BNJ2003] XMM 92 X 06 53 47.100 -23 54 05.58           ~ 1 0
35 [BNJ2003] XMM 14s * 06 53 47.1013003848 -23 44 23.643151800           ~ 1 0
36 [BNJ2003] XMM 36s X 06 53 47.370 -23 53 10.70           ~ 1 0
37 [BNJ2003] XMM 68 X 06 53 47.820 -23 46 46.95           ~ 1 0
38 2MASS J06534790-2404143 * 06 53 47.9044505280 -24 04 14.373837300           ~ 1 0
39 [BNJ2003] XMM 118s X 06 53 48.220 -23 44 15.09           ~ 1 0
40 [BNJ2003] XMM 50s X 06 53 48.270 -23 46 49.11           ~ 1 0
41 [BNJ2003] XMM 60s X 06 53 48.690 -23 46 16.80           ~ 1 0
42 [BNJ2003] XMM 37 X 06 53 48.860 -24 00 09.98           ~ 1 0
43 [BNJ2003] XMM 8 X 06 53 48.930 -24 04 18.21           ~ 1 0
44 [BNJ2003] XMM 41 X 06 53 49.390 -24 05 44.74           ~ 1 0
45 [BNJ2003] XMM 34 X 06 53 51.580 -24 08 23.24           ~ 1 0
46 [BNJ2003] XMM 62 X 06 53 52.680 -24 00 24.23           ~ 1 0
47 [BNJ2003] ROSAT 15 X 06 53 52.900 -24 06 40.00           ~ 1 0
48 [BNJ2003] XMM 17s X 06 53 53.040 -23 46 03.13           ~ 1 0
49 [BNJ2003] XMM 90 X 06 53 53.350 -23 40 41.82           ~ 1 0
50 2MASS J06535336-2402064 * 06 53 53.3637729504 -24 02 06.482986224           ~ 3 0
51 [BNJ2003] XMM 84s X 06 53 53.870 -23 45 25.33           ~ 1 0
52 [BNJ2003] XMM 139 X 06 53 54.360 -23 59 16.38           ~ 1 0
53 [BNJ2003] XMM 57 X 06 53 55.570 -23 46 25.66           ~ 1 0
54 [BNJ2003] XMM 39s X 06 53 57.380 -23 43 35.47           ~ 1 0
55 2MASS J06535839-2353499 X 06 53 58.4007256800 -23 53 50.030751660           ~ 1 0
56 CD-23 4550 * 06 53 59.2467474264 -23 42 24.407562672   10.60 10.70     ~ 17 0
57 2MASS J06540145-2338283 * 06 54 01.4568560952 -23 38 28.297242600           ~ 2 0
58 TYC 6522-2759-1 * 06 54 01.6462166736 -23 46 13.707343020   12.18 10.96 10.67   ~ 5 0
59 [BNJ2003] ROSAT 17 X 06 54 01.800 -24 11 42.00           ~ 1 0
60 2MASS J06540201-2355242 PM* 06 54 02.0218680792 -23 55 24.334677804           ~ 2 0
61 [BNJ2003] XMM 53 X 06 54 02.480 -24 03 42.57           ~ 1 0
62 [BNJ2003] XMM 69s X 06 54 04.610 -23 39 01.52           ~ 1 0
63 2MASS J06540489-2400018 * 06 54 04.8977011440 -24 00 01.879807644           ~ 3 0
64 2MASS J06540495-2351586 * 06 54 04.9590673680 -23 51 58.605051528           ~ 3 0
65 [BNJ2003] XMM 122 X 06 54 05.910 -24 07 32.17           ~ 1 0
66 [BNJ2003] XMM 112 X 06 54 07.720 -23 44 15.99           ~ 1 0
67 [BNJ2003] XMM 58 X 06 54 08.020 -24 00 07.96           ~ 1 0
68 [BNJ2003] XMM 123 X 06 54 08.860 -23 55 57.92           ~ 1 0
69 [BNJ2003] XMM 77 X 06 54 08.950 -24 08 17.47           ~ 1 0
70 [BNJ2003] XMM 48 X 06 54 09.280 -23 45 08.50           ~ 1 0
71 [BNJ2003] XMM 80 X 06 54 10.970 -24 08 03.73           ~ 1 0
72 [BNJ2003] XMM 49 X 06 54 11.040 -23 55 44.71           ~ 1 0
73 [BNJ2003] XMM 47s X 06 54 11.590 -23 46 02.93           ~ 1 0
74 2MASS J06541166-2356393 * 06 54 11.6704018896 -23 56 39.458544900           ~ 1 0
75 [BNJ2003] XMM 33 X 06 54 11.720 -24 04 34.14           ~ 1 0
76 [BNJ2003] XMM 125 X 06 54 11.880 -23 55 25.93           ~ 1 0
77 HD 50896 WR* 06 54 13.0439608392 -23 55 42.023319852 5.74 6.63 6.91 7.74   WN4b 794 0
78 [BNJ2003] XMM 70 X 06 54 13.050 -24 01 02.10           ~ 1 0
79 [BNJ2003] XMM 124 X 06 54 13.100 -23 42 11.66           ~ 1 0
80 [BNJ2003] XMM 143 X 06 54 13.610 -23 53 19.04           ~ 1 0
81 2MASS J06541411-2338488 X 06 54 14.12 -23 38 48.8           ~ 1 0
82 [BNJ2003] XMM 30 X 06 54 15.060 -23 54 53.98           ~ 1 0
83 [BNJ2003] XMM 39 * 06 54 15.6049905744 -23 52 36.051987504           ~ 1 0
84 [BNJ2003] XMM 83 X 06 54 15.780 -23 56 06.22           ~ 1 0
85 [BNJ2003] XMM 95 X 06 54 16.180 -24 07 42.48           ~ 1 0
86 [BNJ2003] XMM 23 * 06 54 17.0253019584 -23 51 19.280633868           ~ 1 0
87 [BNJ2003] XMM 6 X 06 54 17.530 -24 09 01.63           ~ 1 0
88 [BNJ2003] XMM 85s X 06 54 18.230 -23 47 19.62           ~ 1 0
89 [BNJ2003] XMM 120 X 06 54 18.470 -23 41 48.20           ~ 1 0
90 [BNJ2003] XMM 138 X 06 54 20.120 -23 56 23.99           ~ 1 0
91 [BNJ2003] XMM 16 X 06 54 20.490 -23 43 15.00           ~ 1 0
92 [BNJ2003] XMM 148 X 06 54 20.720 -24 01 12.37           ~ 1 0
93 [BNJ2003] XMM 105 X 06 54 20.730 -23 52 31.89           ~ 1 0
94 [BNJ2003] XMM 21 X 06 54 21.920 -24 09 36.64           ~ 1 0
95 [BNJ2003] XMM 51 X 06 54 22.420 -23 54 01.56           ~ 1 0
96 [BNJ2003] XMM 13 X 06 54 22.980 -23 49 28.60           ~ 1 0
97 [BNJ2003] XMM 86 X 06 54 23.000 -23 49 28.07           ~ 1 0
98 [BNJ2003] XMM 87s X 06 54 23.160 -23 46 33.75           ~ 1 0
99 2MASS J06542318-2358272 * 06 54 23.1814210632 -23 58 27.318001728           ~ 3 0
100 [BNJ2003] XMM 47 X 06 54 24.070 -24 00 54.53           ~ 1 0
101 [BNJ2003] XMM 27 X 06 54 24.690 -24 03 45.16           ~ 1 0
102 [BNJ2003] XMM 102 X 06 54 24.8033268549 -24 08 20.740948684           ~ 1 0
103 UCAC4 331-017874 SB* 06 54 24.9282853912 -23 50 32.180284537   13.073 12.234 12.060   ~ 3 0
104 TYC 6522-3077-1 * 06 54 25.2418375416 -23 48 13.984706664   10.87 10.40     ~ 1 0
105 [BNJ2003] XMM 132 X 06 54 25.380 -23 56 32.91           ~ 1 0
106 [BNJ2003] ROSAT 29 X 06 54 26.000 -23 43 49.00           ~ 1 0
107 2MASS J06542612-2337490 * 06 54 26.1206821776 -23 37 49.053302184           ~ 1 0
108 [BNJ2003] XMM 93 X 06 54 27.820 -23 54 07.07           ~ 1 0
109 2MASS J06542823-2405504 * 06 54 28.2339211440 -24 05 50.459651772           ~ 3 0
110 [BNJ2003] XMM 4 X 06 54 28.3929260892 -24 00 28.267890113           ~ 1 0
111 [BNJ2003] XMM 97 X 06 54 29.100 -24 06 36.81           ~ 1 0
112 2MASS J06543053-2402110 * 06 54 30.5345077824 -24 02 11.073554088           ~ 1 0
113 [BNJ2003] XMM 24 X 06 54 31.050 -24 03 18.47           ~ 1 0
114 [BNJ2003] XMM 127 X 06 54 31.880 -23 58 39.79           ~ 1 0
115 [BNJ2003] XMM 101 X 06 54 31.910 -24 00 19.08           ~ 1 0
116 [BNJ2003] XMM 72 X 06 54 33.030 -23 44 45.40           ~ 1 0
117 [BNJ2003] XMM 31 X 06 54 33.690 -23 55 30.30           ~ 1 0
118 [BNJ2003] XMM 54 * 06 54 34.3669495920 -23 56 31.437793500           ~ 1 0
119 [BNJ2003] XMM 43 X 06 54 35.050 -24 02 30.45           ~ 1 0
120 [BNJ2003] XMM 106 X 06 54 35.610 -24 01 25.71           ~ 1 0
121 [BNJ2003] XMM 64 X 06 54 37.720 -23 53 36.04           ~ 1 0
122 [BNJ2003] ROSAT 33 X 06 54 38.300 -24 02 43.00           ~ 1 0
123 [BNJ2003] XMM 11 X 06 54 38.530 -23 52 44.33           ~ 1 0
124 [BNJ2003] XMM 44 X 06 54 39.140 -23 56 28.03           ~ 1 0
125 [BNJ2003] XMM 121 X 06 54 40.060 -23 55 52.88           ~ 1 0
126 [BNJ2003] XMM 118 X 06 54 41.110 -23 58 18.63           ~ 1 0
127 [BNJ2003] XMM 129 X 06 54 42.230 -23 51 58.75           ~ 1 0
128 2MASS J06544269-2407144 * 06 54 42.6984726720 -24 07 14.486276712           ~ 2 0
129 [BNJ2003] ROSAT 35 X 06 54 43.200 -24 10 58.00           ~ 1 0
130 [BNJ2003] XMM 135 X 06 54 43.560 -23 57 45.20           ~ 1 0
131 [BNJ2003] XMM 99 X 06 54 44.990 -23 44 31.48           ~ 1 0
132 [BNJ2003] XMM 146 X 06 54 45.160 -23 54 50.91           ~ 1 0
133 [BNJ2003] XMM 75 X 06 54 45.340 -23 45 37.33           ~ 1 0
134 [BNJ2003] XMM 25 X 06 54 45.510 -23 57 19.45           ~ 1 0
135 [BNJ2003] XMM 119 X 06 54 46.260 -23 57 49.00           ~ 1 0
136 [BNJ2003] ROSAT 36 X 06 54 49.100 -24 01 54.00           ~ 1 0
137 [BNJ2003] XMM 152 X 06 54 49.330 -23 45 16.61           ~ 1 0
138 [BNJ2003] XMM 12 * 06 54 49.3305656424 -24 01 45.515651700           ~ 1 0
139 [BNJ2003] XMM 22 X 06 54 49.650 -23 46 04.96           ~ 1 0
140 [BNJ2003] XMM 130 X 06 54 52.240 -23 48 38.33           ~ 1 0
141 [BNJ2003] XMM 94 X 06 54 53.290 -24 06 13.33           ~ 1 0
142 [BNJ2003] XMM 150 X 06 54 54.870 -24 01 38.00           ~ 1 0
143 ATO J103.7301-23.8940 EB* 06 54 55.2451694712 -23 53 38.855909472           ~ 3 0
144 [BNJ2003] XMM 76 X 06 54 55.780 -23 47 09.75           ~ 1 0
145 [BNJ2003] XMM 131 X 06 54 56.250 -23 58 43.62           ~ 1 0
146 [BNJ2003] XMM 141 X 06 54 56.460 -24 03 43.42           ~ 1 0
147 [BNJ2003] XMM 71 X 06 54 57.170 -23 46 45.46           ~ 1 0
148 [BNJ2003] XMM 46 X 06 54 59.260 -23 56 24.72           ~ 1 0
149 [BNJ2003] XMM 142 X 06 55 01.470 -24 03 25.50           ~ 1 0
150 [BNJ2003] XMM 117 X 06 55 06.170 -23 48 13.66           ~ 1 0
151 [BNJ2003] ROSAT 39 X 06 55 12.400 -23 51 32.00           ~ 1 0
152 Cl Collinder 121 OpC 06 56 20 -24 43.8   3.02 2.6     ~ 156 0
153 Ass CMa OB 2 As* ~ ~           ~ 12 0

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