2017ApJ...837..130V

Query : 2017ApJ...837..130V

2017ApJ...837..130V - Astrophys. J., 837, 130-130 (2017/March-2)

A Chandra X-Ray census of the interacting binaries in old open clusters - Collinder 261.

VATS S. and VAN DEN BERG M.

Abstract (from CDS):

We present the first X-ray study of Collinder 261 (Cr 261), which at an age of 7 Gyr is one of the oldest open clusters known in the Galaxy. Our observation with the Chandra X-Ray Observatory is aimed at uncovering the close interacting binaries in Cr 261, and reaches a limiting X-ray luminosity of LX~4×1029 erg s–1 (0.3-7 keV) for stars in the cluster. We detect 107 sources within the cluster half-mass radius rh, and we estimate that among the sources with LX 1030 erg s–1, ∼26 are associated with the cluster. We identify a mix of active binaries and candidate active binaries, candidate cataclysmic variables, and stars that have "straggled" from the main locus of Cr 261 in the color-magnitude diagram. Based on a deep optical source catalog of the field, we estimate that Cr 261 has an approximate mass of 6500 M☉, roughly the same as the old open cluster NGC 6791. The X-ray emissivity of Cr 261 is similar to that of other old open clusters, supporting the trend that they are more luminous in X-rays per unit mass than old populations of higher (globular clusters) and lower (the local neighborhood) stellar density. This implies that the dynamical destruction of binaries in the densest environments is not solely responsible for the observed differences in X-ray emissivity.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: close - novae, cataclysmic variables - open clusters and associations: individual: Collinder 261 - stars: activity - X-rays: binaries - X-rays: binaries

VizieR on-line data: <Available at CDS (J/ApJ/837/130): table1.dat table2.dat>

Nomenclature: Table 1: [VV2017] NNN (Nos 1-151).

Simbad objects: 161

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Number of rows : 161
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
3 Cl Berkeley 17 OpC 05 20 30.5 +30 34 20           ~ 192 0
4 NGC 2682 81 BS* 08 51 11.7789373696 +11 45 22.123673277   9.96 10.024     B8V 114 0
5 NGC 2682 131 SB* 08 51 20.794032 +11 53 26.13120   11.647 11.248 11.042 10.722 F5IV 128 0
6 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
7 [VV2017] 92 X 12 36 30.770 -68 22 49.29           ~ 1 0
8 [VV2017] 44 CV? 12 36 40.644 -68 21 22.09   22.95 21.67     ~ 1 0
9 [VV2017] 52 X 12 36 44.988 -68 19 26.41           ~ 1 0
10 [VV2017] 131 X 12 36 46.273 -68 25 28.43           ~ 1 0
11 [VV2017] 36 X 12 36 56.322 -68 22 04.56     22.1     ~ 1 0
12 [VV2017] 60 * 12 36 56.6260490952 -68 24 49.197935484           ~ 6 0
13 [VV2017] 23 X 12 37 04.714 -68 23 32.00           ~ 1 0
14 [VV2017] 26 X 12 37 07.433 -68 23 34.55           ~ 1 0
15 [VV2017] 41 XB? 12 37 07.462 -68 24 43.99   21.49 20.15     ~ 1 0
16 [VV2017] 64 X 12 37 08.808 -68 23 21.16           ~ 1 0
17 [VV2017] 43 X 12 37 09.389 -68 27 08.13           ~ 1 0
18 [VV2017] 45 X 12 37 11.600 -68 20 36.59           ~ 1 0
19 [VV2017] 119 X 12 37 14.879 -68 20 18.61     21.50     ~ 1 0
20 [VV2017] 40 X 12 37 15.672 -68 27 28.61   14.05 13.52     ~ 1 0
21 [VV2017] 32 X 12 37 16.285 -68 20 36.14           ~ 1 0
22 [VV2017] 28 XB* 12 37 16.330 -68 25 18.75   17.432 16.164     ~ 1 0
23 [VV2017] 117 X 12 37 18.303 -68 18 22.98           ~ 1 0
24 [VV2017] 80 XB? 12 37 23.355 -68 27 45.23   20.53 19.35     ~ 1 0
25 [VV2017] 66 X 12 37 24.411 -68 28 54.15           ~ 1 0
26 [VV2017] 49 XB* 12 37 25.408 -68 24 43.91   16.913 15.899     ~ 1 0
27 [VV2017] 128 XB* 12 37 27.228 -68 23 16.02   21.68 20.26     ~ 1 0
28 [VV2017] 48 X 12 37 29.197 -68 17 06.75           ~ 1 0
29 [VV2017] 135 X 12 37 31.023 -68 18 41.99           ~ 1 0
30 V* GZ Mus XB* 12 37 31.1667807504 -68 21 28.064598120   18.193 17.078     ~ 12 0
31 [VV2017] 35 X 12 37 32.870 -68 26 48.22           ~ 1 0
32 V* HH Mus EB* 12 37 32.9252618723 -68 22 54.725981328   22.15 20.27     ~ 5 0
33 [VV2017] 11 X 12 37 34.741 -68 14 18.63           ~ 1 0
34 [VV2017] 141 X 12 37 35.415 -68 20 40.29           ~ 1 0
35 [VV2017] 38 CV? 12 37 35.863 -68 14 30.79           ~ 1 0
36 [VV2017] 111 X 12 37 38.931 -68 21 18.84           ~ 1 0
37 [VV2017] 2 X 12 37 40.935 -68 27 30.84           ~ 1 0
38 [VV2017] 56 X 12 37 41.300 -68 21 30.00           ~ 1 0
39 [VV2017] 129 X 12 37 43.728 -68 25 18.98   13.79 13.07     ~ 1 0
40 [VV2017] 74 BS* 12 37 44.188 -68 28 28.64   15.482 14.606     ~ 1 0
41 V* HK Mus XB* 12 37 44.6669163129 -68 25 43.319918526           ~ 7 0
42 [VV2017] 10 X 12 37 44.938 -68 20 32.39   22.28 20.40     ~ 1 0
43 [VV2017] 113 X 12 37 45.921 -68 21 09.49           ~ 1 0
44 [VV2017] 6 X 12 37 50.568 -68 28 07.71           ~ 1 0
45 [VV2017] 47 XB* 12 37 51.129 -68 26 20.28   21.26 19.83     ~ 1 0
46 [VV2017] 12 * 12 37 51.334 -68 25 35.49   18.121 16.739     ~ 1 0
47 V* HN Mus BS* 12 37 51.3853592376 -68 22 34.372054884   16.795 15.803     ~ 14 0
48 [VV2017] 59 X 12 37 52.791 -68 25 59.04     13.75     ~ 1 0
49 [VV2017] 29 X 12 37 53.468 -68 20 00.06     22.5     ~ 1 0
50 [VV2017] 83 X 12 37 55.034 -68 15 42.90           ~ 1 0
51 [VV2017] 79 X 12 37 55.187 -68 25 14.18           ~ 1 0
52 [VV2017] 99 X 12 37 55.683 -68 26 07.58           ~ 1 0
53 V* HT Mus EB* 12 37 57.2670238609 -68 25 02.179209424   20.08 12.90     ~ 7 0
54 [VV2017] 13 XB* 12 37 57.7239545256 -68 24 21.846967560   16.946 16.042     ~ 6 0
55 [VV2017] 70 CV? 12 37 58.441 -68 23 01.55   23.2 22.3     ~ 1 0
56 [VV2017] 21 X 12 37 58.732 -68 30 58.09           ~ 1 0
57 [VV2017] 137 X 12 37 58.881 -68 24 07.59   23.75 21.65     ~ 1 0
58 [VV2017] 51 XB* 12 37 59.0605874808 -68 25 10.171301916   18.674 17.558     ~ 6 0
59 [VV2017] 9 * 12 37 59.125 -68 16 09.34   16.608 15.458     ~ 1 0
60 Cl* Collinder 261 SBR 11 * 12 37 59.7130932984 -68 23 49.784777520   15.438 14.145   12.654 ~ 17 0
61 [VV2017] 78 XB* 12 37 59.7574799064 -68 23 03.250339260   18.238 17.134     ~ 6 0
62 V* HW Mus EB* 12 38 00.0102252504 -68 22 34.659655752   18.96 17.810     ~ 5 0
63 [VV2017] 112 XB* 12 38 00.215 -68 25 11.28   21.07 19.55     ~ 1 0
64 [VV2017] 61 XB* 12 38 00.537 -68 27 10.22   19.67 18.38     ~ 1 0
65 2MASS J12380064-6821597 XB* 12 38 00.6471196584 -68 21 59.633690436   17.547 16.440     ~ 9 0
66 [VV2017] 148 XB* 12 38 00.872 -68 22 26.12   21.4 19.81     ~ 1 0
67 [VV2017] 65 X 12 38 02.684 -68 30 00.59   22.8       ~ 1 0
68 Cl Collinder 261 OpC 12 38 04.7 -68 22 40     10.7     ~ 216 0
69 [VV2017] 33 X 12 38 04.730 -68 23 34.13           ~ 1 0
70 [VV2017] 142 XB* 12 38 05.161 -68 25 31.74   18.952 17.842     ~ 1 0
71 [VV2017] 139 XB* 12 38 05.546 -68 21 00.65   20.18 19.04     ~ 1 0
72 [VV2017] 39 X 12 38 05.594 -68 26 23.45           ~ 1 0
73 [VV2017] 124 XB* 12 38 05.944 -68 22 55.78   20.26 19.06     ~ 1 0
74 [VV2017] 108 X 12 38 06.597 -68 26 16.79           ~ 1 0
75 [VV2017] 143 XB* 12 38 06.761 -68 19 14.05   22.48 20.96     ~ 1 0
76 [VV2017] 125 XB? 12 38 08.4614738688 -68 19 37.262560980   18.376 17.286     ~ 5 0
77 [VV2017] 50 X 12 38 08.909 -68 16 13.66           ~ 1 0
78 [VV2017] 121 X 12 38 09.295 -68 14 38.43           ~ 1 0
79 [VV2017] 81 XB* 12 38 09.876 -68 20 32.92           ~ 1 0
80 [VV2017] 102 * 12 38 10.5206014416 -68 21 05.357562912           ~ 6 0
81 [VV2017] 54 CV? 12 38 10.720 -68 27 50.82   22.6 21.20     ~ 1 0
82 [VV2017] 109 X 12 38 11.408 -68 13 08.89           ~ 1 0
83 V* IK Mus XB* 12 38 11.6153067216 -68 24 10.286091144   18.472 17.331     ~ 12 0
84 [VV2017] 82 XB* 12 38 11.653 -68 25 22.98   20.45 19.19     ~ 1 0
85 V* IL Mus XB* 12 38 11.9153344056 -68 19 33.867400980   19.682 18.962     ~ 8 0
86 V* IM Mus EB* 12 38 12.1300928592 -68 17 12.254061732   19.386 18.221     ~ 10 0
87 [VV2017] 140 X 12 38 12.387 -68 24 41.26           ~ 1 0
88 [VV2017] 118 * 12 38 12.5718101352 -68 23 03.263424576           ~ 6 0
89 V* IO Mus EB* 12 38 13.5149932824 -68 22 14.240260632           ~ 11 0
90 [VV2017] 84 X 12 38 13.635 -68 26 37.85           ~ 1 0
91 [VV2017] 150 X 12 38 13.749 -68 26 08.30   17.819 16.712     ~ 1 0
92 [VV2017] 130 BS* 12 38 14.289 -68 20 02.68   16.22 15.303     ~ 1 0
93 [VV2017] 151 CV? 12 38 15.318 -68 19 41.75   20.23 19.16     ~ 1 0
94 [VV2017] 85 XB* 12 38 15.413 -68 24 27.36   20.06 18.83     ~ 1 0
95 [VV2017] 110 X 12 38 15.900 -68 21 34.79           ~ 1 0
96 [VV2017] 147 XB* 12 38 16.3620717048 -68 22 13.201107168   17.436 16.454     ~ 7 0
97 V* IP Mus BS* 12 38 16.5589098960 -68 25 18.946431444   15.187 14.361     ~ 15 0
98 V* IQ Mus BS* 12 38 16.7179306080 -68 24 36.080954964   16.605 15.781     ~ 16 0
99 [VV2017] 19 X 12 38 17.199 -68 20 39.94           ~ 1 0
100 [VV2017] 90 X 12 38 17.989 -68 24 17.86           ~ 1 0
101 [VV2017] 146 X 12 38 19.503 -68 18 30.07           ~ 1 0
102 [VV2017] 71 X 12 38 19.901 -68 19 08.44           ~ 1 0
103 [VV2017] 20 CV? 12 38 21.337 -68 13 12.29   22.39 21.79     ~ 1 0
104 [VV2017] 17 X 12 38 21.727 -68 28 20.73   22.9 22.4     ~ 1 0
105 [VV2017] 134 XB* 12 38 22.154 -68 25 57.87   22.15 20.54     ~ 1 0
106 [VV2017] 1 X 12 38 23.352 -68 22 06.93           ~ 1 0
107 [VV2017] 88 XB* 12 38 23.432 -68 17 07.00   21.39 19.90     ~ 1 0
108 [VV2017] 31 * 12 38 23.4500057976 -68 28 20.955416340   18.431 17.107     ~ 6 0
109 [VV2017] 103 XB* 12 38 23.821 -68 23 30.98   19.834 18.714     ~ 1 0
110 [VV2017] 115 XB? 12 38 26.0194497672 -68 25 34.027679640   20.96 19.70     ~ 2 0
111 [VV2017] 114 X 12 38 26.854 -68 18 59.15     21.50     ~ 1 0
112 [VV2017] 98 X 12 38 28.016 -68 24 42.73           ~ 1 0
113 [VV2017] 87 XB* 12 38 28.230 -68 21 16.55   20.98 19.50     ~ 1 0
114 [VV2017] 145 X 12 38 28.508 -68 26 24.46           ~ 1 0
115 V* IT Mus AB* 12 38 28.9336802864 -68 19 20.401806036   19.91 18.92     ~ 7 0
116 TYC 9228-1801-1 SB* 12 38 32.4824275608 -68 29 49.373239956   12.23 11.09     ~ 2 0
117 [VV2017] 122 X 12 38 32.582 -68 23 24.78           ~ 1 0
118 [VV2017] 95 X 12 38 32.800 -68 22 02.19   14.464 13.744     ~ 1 0
119 [VV2017] 75 * 12 38 33.4751582160 -68 16 24.575510640           ~ 6 0
120 [VV2017] 104 X 12 38 33.695 -68 20 11.61           ~ 1 0
121 [VV2017] 46 XB* 12 38 35.221 -68 30 46.44           ~ 1 0
122 [VV2017] 53 X 12 38 35.406 -68 14 47.44   23.51 21.51     ~ 1 0
123 TYC 9228-355-1 * 12 38 35.541 -68 26 22.47   13.01 12.68     ~ 1 0
124 [VV2017] 106 X 12 38 36.834 -68 20 13.87           ~ 1 0
125 [VV2017] 30 X 12 38 36.929 -68 27 21.58   13.64 13.11     ~ 1 0
126 [VV2017] 107 X 12 38 39.256 -68 20 14.33           ~ 1 0
127 [VV2017] 76 X 12 38 39.395 -68 26 09.97           ~ 1 0
128 [VV2017] 8 CV? 12 38 39.745 -68 17 26.43   21.87 21.10     ~ 1 0
129 [VV2017] 101 X 12 38 39.946 -68 28 11.40           ~ 1 0
130 [VV2017] 116 X 12 38 41.324 -68 24 47.30           ~ 1 0
131 [VV2017] 105 X 12 38 41.717 -68 21 04.69           ~ 1 0
132 [VV2017] 22 CV? 12 38 42.061 -68 13 26.94   23.3       ~ 1 0
133 V* IW Mus XB* 12 38 42.37 -68 22 03.6   17.904 16.915     ~ 6 0
134 [VV2017] 91 X 12 38 44.754 -68 26 06.97   22.63 20.63     ~ 1 0
135 [VV2017] 132 BS* 12 38 45.287 -68 23 36.05   15.839 14.842     ~ 1 0
136 [VV2017] 42 X 12 38 46.806 -68 26 50.41           ~ 1 0
137 V* KK Mus EB* 12 38 50.3588010024 -68 16 40.194566220   17.495 16.452     ~ 6 0
138 [VV2017] 3 X 12 38 54.090 -68 15 56.57           ~ 1 0
139 [VV2017] 72 X 12 38 58.302 -68 27 03.40           ~ 1 0
140 [VV2017] 34 X 12 38 58.398 -68 17 43.76           ~ 1 0
141 [VV2017] 73 BS* 12 38 59.853 -68 23 07.41   14.921 14.028     ~ 1 0
142 [VV2017] 4 CV? 12 39 02.876 -68 22 28.51   22.92 21.65     ~ 1 0
143 [VV2017] 67 BS* 12 39 08.748 -68 24 05.49   17.312 16.520     ~ 1 0
144 [VV2017] 62 XB? 12 39 11.081 -68 17 05.55           ~ 1 0
145 [VV2017] 58 * 12 39 12.640 -68 27 37.39   19.166 17.744     ~ 1 0
146 [VV2017] 57 XB? 12 39 13.8179327568 -68 18 35.285961636   18.59 17.563     ~ 3 0
147 [VV2017] 37 X 12 39 14.577 -68 23 16.06           ~ 1 0
148 [VV2017] 25 XB? 12 39 18.650 -68 16 11.32   17.585 16.381     ~ 1 0
149 [VV2017] 96 X 12 39 18.887 -68 25 58.37           ~ 1 0
150 [VV2017] 127 X 12 39 19.128 -68 23 46.88           ~ 1 0
151 [VV2017] 77 X 12 39 20.285 -68 18 04.72   22.87 20.97     ~ 1 0
152 [VV2017] 16 X 12 39 23.522 -68 22 00.16           ~ 1 0
153 [VV2017] 63 X 12 39 26.757 -68 25 08.30     19.95     ~ 1 0
154 [VV2017] 55 * 12 39 28.6507638744 -68 24 53.091029124   18.423 17.623     ~ 6 0
155 [VV2017] 15 X 12 39 31.807 -68 17 30.79   20.52 18.903     ~ 1 0
156 [VV2017] 5 X 12 39 31.989 -68 25 59.37           ~ 1 0
157 [VV2017] 69 X 12 39 33.396 -68 17 58.97     22.7     ~ 1 0
158 [VV2017] 24 CV? 12 39 39.487 -68 18 58.42   21.4 20.37     ~ 1 0
159 [VV2017] 14 X 12 39 53.622 -68 20 51.97           ~ 1 0
160 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
161 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0

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