Table 3
Proper motions between the epochs indicated as the last two digits of the year.
| Source | Epochs | ⟨ xẏ ⟩ | ⟨ ȧ ⟩ |
|
⟨ Va ⟩ | |
| (mas yr-1) | (mas yr-1) | (mas yr-1) | (km s-1) | |||
|
|
||||||
| VX Sgr | 94–99 | 2.3 ± 0.1 | 1.4 ± 0.1 | − 0.1 ± 0.1 | 12.0 ± 0.2 | |
| S Per | 94–99 | 0.9 ± 0.1 | 0.5 ± 0.1 | 0.0 ± 0.1 | 4.9 ± 0.1 | |
| U Ori | 00–01 | 5.0 ± 0.1 | 0.7 ± 0.1 | − 0.5 ± 0.1 | 0.9 ± 0.1 | |
| U Her | 00–01 | 2.1 ± 0.1 | 1.4 ± 0.1 | − 0.1 ± 0.1 | 1.7 ± 0.1 | |
| IK Tau | 00–01 | 5.2 ± 0.1 | 4.6 ± 0.1 | − 0.5 ± 0.1 | 6.0 ± 0.1 | |
| RT Vir | 96(11) | 16.0 ± 0.3 | 11.1 ± 0.3 | 0.7 ± 0.4 | 6.3 ± 0.1 | |
| RT Vir | 96(55) | 24.3 ± 0.2 | 16.0 ± 0.2 | − 0.2 ± 0.2 | 8.0 ± 0.1 | |
| W Hya | 99–00 | 10.6 ± 1.0 | 1.3 ± 1.0 | 0.1 ± 1.0 | 0.6 ± 0.4 | |
| W Hya | 00–01 | 11.1 ± 0.8 | 1.9 ± 1.0 | − 1.4 ± 1.0 | 0.8 ± 0.6 | |
| W Hya | 01–02 | 6.6 ± 0.5 | 6.3 ± 0.6 | 1.7 ± 0.6 | 3.2 ± 0.3 | |
| W Hya | 99–00–01 | 6.3 ± 2.1 | 6.3 ± 2.0 | − 0.3 ± 0.7 | 3.0 ± 1.0 | |
| W Hya | 00–01–02 | 6.2 ± 0.3 | 6.2 ± 0.3 | 0.1 ± 0.1 | 2.9 ± 0.2 | |
Notes. The error-weighted means of total proper motion ( ⟨ xẏ ⟩ ), its radial and tangential components ( ⟨ ȧ ⟩ and ) and the radial velocity ( ⟨ Va ⟩ ) are given, with formal uncertainties. All measurements are relative to the aligned centres of expansion, i.e. ignoring the systemic, bulk motion. The number of matches between two epochs, Nprev, was given in Table 2. For W Hya, 2 features were matched at three epochs from 1999–2000–2001 and 4 from three epochs 2000–2001–2002. RT Vir was observed 6 times in ten weeks; the first line gives the means for the 11 features seen at all epochs and the second line gives means for all 55 matches at any epochs. See Sect. 3.2 for more details.
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