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Table 9

Absolute astrometric results.

Object JD−2 446 000 Ref. Separation Sign.a Sign. orb. PAb Sign.a Sign. orb.
 [days]  [arcsec] not Backg. motion [°] not Backg. motion
ρ  ± δ ρ σ ρ,   back σ ρ,   orb PA ± δ PA σ PA,   back σ PA,   orb
RX J0915.5-7609
AB 4172.50000 1 0.111 ± 0.007 16 3.1 292.5 ± 4.3 0.5 7.1
8161.53412 0.1489 ± 0.0031 6.9 1.6 262.763 ± 1.412 5.3 1.5
8881.59508 0.1385 ± 0.0055 c c 259.287 ± 1.920 c c
RX J0919.4-7738
AaB 8515.51911 8.9727 ± 0.1357 194.218 ± 1.400
AbB 8515.51911 8.9351 ± 0.1352 194.858 ± 1.400
(AaAb)Bd 925.53114 2 9.020 ± 0.050 12 0.4 192.350 ± 0.740 7.1 1.3
2348.81400 3 9.0250 ± 0.0051 10 0.5 194.154 ± 0.036 5.7 0.2
5549.68730 4 8.9907 ± 0.0881 4.5 0.2 194.396 ± 0.797 2.6 0.1
8515.51911 8.9567 ± 0.1355 c c 194.487 ± 1.400 c c
AaAb 4172.50000 1 0.109 ± 0.003 43 0.4 173.9 ± 1.2 29 21
8515.51911 0.1070 ± 0.0035 c c 125.175 ± 2.008 c c
RX J0935.0-7804
AB 4173.50000 1 0.360 ± 0.003 21 8.0 353.9 ± 0.2 16 5.5
8161.59183 0.4114 ± 0.0059 9.6 0.8 346.840 ± 1.328 5.0 0.6
8515.10153 0.4146 ± 0.0048 6.2 0.5 346.215 ± 1.009 3.3 0.3
8882.58189 0.4189 ± 0.0067 c c 345.630 ± 1.483 c c
RX J0952.7-7933
AB 4173.50000 1 0.267 ± 0.003 13 2.7 314.6 ± 0.5 12 15
8160.58336 0.2852 ± 0.0043 7.4 0.4 296.912 ± 1.356 4.2 3.6
8514.65391 0.2838 ± 0.0032 6.9 0.2 295.658 ± 1.033 3.8 3.3
8881.63897 0.2818 ± 0.0048 4.8 0.1 293.627 ± 1.498 2.3 2.0
9250.53614 0.2805 ± 0.0047 2.8 0.3 291.421 ± 1.565 1.2 1.0
9553.86365 0.2819 ± 0.0050 0.7 0.1 289.616 ± 1.633 0.2 0.2
9645.57285 0.2826 ± 0.0050 c c 289.222 ± 1.653 c c
RX J1014.2-7636
AB 4174.50000 1 0.091 ± 0.007 22 19 259.6 ± 6.5 5.8 4.4
9250.56298 0.2392 ± 0.0041 14 1.9 291.248 ± 1.571 1.0 0.9
9645.60036 0.2510 ± 0.0045 c c 289.085 ± 1.654 c c
SZ Cha
AB 3476.50000 5 5.3 ± 0.2 2.0 0.8 121 ± 2 1.6 0.9
5101.55583 6 5.118 ± 0.012 2.0 0.0 123.00 ± 0.15 1.0 0.2
7782.64912 5.1151 ± 0.0685 0.5 0.0 123.264 ± 1.236 0.2 0.0
7821.89696 6 5.122 ± 0.0146 0.7 0.0 122.9 ± 0.6 0.4 0.2
8881.66756 5.1189 ± 0.0819 c c 123.258 ± 1.481 c c
Ced 110 IRS 2
AB 7782.61949 0.1481 ± 0.0027 8.7 1.1 128.196 ± 1.428 0.3 2.6
7819.92133 6 0.140 ± 0.0063 4.7 0.4 126.1 ± 2.8 0.6 1.2
8515.61187 0.1427 ± 0.0039 c c 121.952 ± 1.888 c c
Cha Hα 2
AB 5843.40756 7,8 0.21 ± 0.05 0.1 1.0 37.6 ± 6.4 2.9 0.6
7454.63563 7,9 0.1652 ± 0.0037 1.0 1.3 40.121 ± 1.871 2.1 0.5
7782.68981 7 0.1667 ± 0.0031 1.5 1.9 40.875 ± 1.436 2.0 0.2
8160.71934 7 0.1591 ± 0.0026 c c 41.250 ± 1.402 c c
VW Cha
AB 7783.90711 0.6491 ± 0.0087 178.929 ± 1.236
AC 7783.90711 0.7153 ± 0.0096 185.324 ± 1.236
A(BC)e 2630.83699 10 0.69 ± 0.01 1.6 1.3 178.7 ± 3.2 6.9 0.8
3468.50000 5 0.66 ± 0.03 1.7 0.4 184 ± 2 6.5 1.1
3490.53749 11 0.72 ± 0.03 0.6 1.5 178.6 ± 1.0 9.8 1.8
5230.38638 12,13 0.6592 ± 0.0253 1.2 0.6 178.001 ± 0.405 10 2.6
5615.50000 14 0.683 ± 0.008 0.5 0.9 179.4 ± 0.7 8.4 1.4
6690.70028 15 0.6770 ± 0.0011 0.2 0.5 180.076 ± 0.483 5.5 1.0
7783.90711 0.6722 ± 0.0090 f f 181.404 ± 1.236 f f
7821.93038 6 0.6749 ± 0.0025 0.2 0.3 181.148 ± 0.581 0.2 0.2
BC 5615.50000 14 0.100 ± 0.006 9.3 0.1 233.3 ± 3.3 2.8 0.6
6690.70028 15 0.113 ± 0.001 6.7 7.1 232.9 ± 0.5 3.1 1.3
7783.90711 0.1008 ± 0.0014 f f 231.136 ± 1.238 f f
7821.93038 6 0.100 ± 0.0012 0.4 0.4 231.0 ± 0.8 0.3 0.1
RX J1109.4-7627
AB 7820.51080 16 0.0806 ± 0.0018 0.8 2.3 85.733 ± 1.376 3.4 10.1
8882.81186 0.0792 ± 0.0020 3.1 1.8 70.222 ± 1.708 2.1 3.2
9251.69870 0.0736 ± 0.0024 c c 62.006 ± 1.914 c c
HD 97300
AB 3468.50000 5 0.84 ± 0.04 1.9 1.4 327 ± 2 5.9 0.2
7820.90105 16 0.7855 ± 0.0106 0.8 0.2 326.994 ± 1.246 1.5 0.3
8160.60766 0.7827 ± 0.0112 0.4 0.0 326.908 ± 1.320 0.8 0.2
8516.71442 0.7819 ± 0.0118 c c 326.489 ± 1.250 c c
WX Cha
AB 3473.50000 5 0.79 ± 0.04 5.1 1.0 55 ± 2 6.1 1.0
7819.89102 16 0.7464 ± 0.0106 3.2 0.0 52.169 ± 1.275 1.5 0.2
8881.91858 0.7467 ± 0.0120 c c 52.502 ± 1.482 c c
WY Cha
AB 7819.63848 16 0.1241 ± 0.0033 7.5 0.4 241.737 ± 1.474 2.8 0.5
8516.70106 0.1227 ± 0.0019 c c 240.775 ± 1.407 c c
HJM C 7-11
AB 3476.50000 5 1.2g ± 0.1 5.2 10g 336 ± 5 7.1 0.8
7819.57870 16 0.1772 ± 0.0041 6.3 0.6 334.781 ± 1.440 7.7 1.4
8161.78979 0.1774 ± 0.0044 4.9 0.6 333.033 ± 1.788 5.6 0.5
8515.79485 0.1748 ± 0.0032 3.8 0.1 332.639 ± 1.542 4.1 0.4
8881.70578 0.1744 ± 0.0029 c c 331.856 ± 1.491 c c
Sz 41
AB 3476.50000 5 1.5 ± 0.8 0.4 0.6 150 ± 20 1.4 0.6
6661.86278 15 1.974 ± 0.002 2.6 0.1 162.4 ± 0.5 3.7 0.3
7819.54463 16 1.9720 ± 0.0266 1.2 0.1 162.737 ± 1.245 1.8 0.1
8619.97904 12 1.9623 ± 0.0169 0.1 0.4 162.200 ± 0.193 1.4 0.4
8881.88546 1.9760 ± 0.0316 0.3 0.0 162.685 ± 1.482 0.5 0.1
9250.08623 1.9767 ± 0.0334 c c 162.862 ± 1.564 c c
HM Anon
AB 3470.50000 5 0.27 ± 0.03 9.6 0.9 236 ± 5 6.2 2.3
7820.86777 16 0.2469 ± 0.0033 9.1 1.0 246.743 ± 1.245 4.8 0.6
8234.48285 16 0.2455 ± 0.0036 6.0 0.7 247.312 ± 1.338 2.5 0.3
8515.69528 0.2440 ± 0.0037 3.9 0.4 247.635 ± 1.401 1.9 0.2
8882.87337 0.2419 ± 0.0039 c c 247.991 ± 1.483 c c

Notes.

(a)

Assuming the fainter component is a non-moving background star.

(b)

Position angle (PA) is measured from N over E to S.

(c)

Significances are given relative to the last epoch.

(d)

Results of component A relative to the centre of brightness (brightness ratio  ~ 1.37 at Ks band).

(e)

Results of component A relative to the centre of brightness (brightness ratio  ~ 1.75 at Ks band as well as to the centre of mass (masses from apparent magnitudes, Table 7, and distance of Chamaeleon cloud of 165  ±  30 pc, using the models of Baraffe et al. (1998), giving for B 0.37 M⊙ and for C 0.21 M⊙ at 1 Myr, resulting in approximately the same ratio of  ~ 1.76 as the brightnesses) of components B and C.

(f)

Significances are given relative to the second to last epoch.

(g)

Included as given in Ghez et al. (1997), this might be a typo, being actually 0.2 arcsec.

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