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Home All issues Volume 500 / No 2 (June III 2009) A&A, 500 2 (2009) L13-L16 Full HTML
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Table 1:

List of candidate binary clusters (WEBDA).
Pair # Cluster 1 Cluster 2 $\tau_1$ $\tau_2$ $\Delta t$ S d $V_{\rm r}$ 1 pm RA 1 pm dec 1 $V_{\rm r}$ 2 pm RA 2 pm dec 2
      (Myr) (Myr) (Myr) (pc) (pc) (km s-1) (mas yr-1) (mas yr-1) (km s-1) (mas yr-1) (mas yr-1)
1 ASCC 100 ASCC 101 102 331 229 23 350 -22.89 2.29 -1.51 - 0.81 1.87
2 Collinder 70 NGC 1981 5 32 26 24 391 19.49 0.36 -0.68 27.94 1.01 1.14
3 NGC 1976 NGC 1981 13 32 19 7 400 - 1.67 -0.3 27.94 1.01 1.14
4 ASCC 20 ASCC 16 22 8 14 13 460 17.62 -0.09 0.51 0.75 0.75 -0.18
5 NGC 6405 ASCC 90 94 646 551 26 500 10.4 -2.19 -5.4 - -2.49 -3.64
6 ASCC 21 ASCC 18 13 13 0 25 500 19.9 0.52 -0.62 13.39 0.89 -0.02
7 Loden 1171 Loden 1194 282 339 57 14 500 - -13.46 -5.75 - -10.07 -3.29
8 Loden 46 ASCC 34 1071 398 673 29 540 - -14.11 2.98 - -2.36 -1.87
9 Loden 46 NGC 3228 1071 85 986 30 544 - -14.11 2.98 - -15.64 -0.05
10 NGC 6469 Ruprecht 139 229 1122 893 21 550 - 3.04 -1.2 - -1.1 -2.19
11 Johansson 1 Alessi 8 199 83 116 29 575 - - - - -6.05 -7.01
12 Ruprecht 139 Bochum 14 1122 10 1112 28 578 - -1.1 -2.19 - - -
13 Loden 565 ASCC 68 112 447 334 7 650 10.1 -3.14 -0.96 - -4.81 3.71
14 BH 91 Ruprecht 89 162 955 793 23 740 - -6.25 4.22 - -6.82 4.36
15 ASCC 4 NGC 189 219 10 209 22 752 -9.55 0.11 -1.48 - - -
16 NGC 1746 NGC 1758 155 398 243 2 760 2.0 -1.87 -3.07 - -1.44 -3.5
17 Basel 5 NGC 6425 741 22 719 28 778 - - - - 3.11 -2.79
18 Collinder 197 ASCC 50 13 30 17 20 838 33.1 -9.8 7.4 17.13 -6.39 3.85
19 NGC 6250 Lynga 14 26 5 21 21 865 - -0.19 -3.3 - - -
20 Ruprech 91 ESO 128-16 427 832 405 17 900 7.3 -11.1 3.11 - -2.57 6.1
21 NGC 2447 NGC 2448 387 15 372 15 1037 21.7 -4.85 4.47 15.0 -3.8 4.69
22 Ruprecht 172 Biurakan 2 813 10 803 11 1106 - -0.42 -3.97 - -2.52 -6.53
23 NGC 6242 Trumpler 24 41 8 32 25 1138 - 0 1.65 -4 -0.87 -1.27
24 NGC 2302 NGC 2306 70 708 638 22 1182 - - - - -0.98 1.91
25 ASCC 6 Stock 4 148 501 353 21 1200 -20.0 -1.02 -1.18 - 1.47 1.18
26 NGC 6613 NGC 6618 17 1 16 22 1296 -14.0 -1.02 -1.33 - 1.79 -1.96
27 Basel 8 NGC 2251 126 267 141 7 1329 - - - 24.7 - -
28 Markarian 38 Collinder 469 8 63 55 22 1471 -18.0 0.07 -2.2 - - -
29 Trumpler 22 NGC 5617 89 82 7 21 1516 - - - - -2.04 -2.32
30 NGC 6871 Biurakan 1 9 18 9 27 1574 -7.7 -2.89 -5.65 -8.48 -3.51 -6.24
31 Carraro 1 Loden 165 3020 3020 0 10 1900 - - - - - -
32 NGC 659 NGC 663 35 16 19 25 1938 - -2.67 1.07 -32.0 -1.49 -2.3
33 Ruprecht 151 NGC 2428 309 479 170 19 2100 - -4.3 2.1 - -2.02 1.12
34 NGC 3324 NGC 3293 6 10 5 21 2327 - -7.46 3.11 -13.0 -7.53 3.1
$\tau_i$: cluster age in Myr (i = 1, 2); $\Delta t = \tau_1 - \tau_2$: age difference in Myr; S: cluster pair spatial separation in pc; d: heliocentric distance to the closest member of the pair in pc; $V_{\rm r} i$: average radial velocity in km s-1; pm RA i: average proper motion in RA ( ${=}\mu_{\alpha}\cos\delta$) mas yr-1; pm dec i: average proper motion in Dec ( ${=}\mu_{\delta}$) mas yr-1.

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