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Table 1
Proper motions in the jet of HL Tau.
| Knot | Δα(arcsec) | Δδ(arcsec) | Vt (km s-1) | PA (deg) |
|
|
||||
| full velocity range | ||||
| A | 13.6 | 10.9 | 60 ± 40 | 45 ± 19 |
| high radial velocity structures | ||||
| B | 16.4 | 14.7 | 162 ± 40 | 47 ± 12 |
| C | 20.3 | 18.6 | 157 ± 40 | 46 ± 15 |
| D | 24.9 | 27.7 | 155 ± 40 | 47 ± 19 |
| E | 34.7 | 34.6 | 150 ± 40 | 47 ± 19 |
| low radial velocity structures | ||||
| B | 17.1 | 13.7 | 154 ± 50 | 44 ± 15 |
| C | 19.8 | 17.1 | 167 ± 50 | 35 ± 24 |
| D | 27.6 | 26.6 | 161 ± 50 | 36 ± 17 |
Notes. Column 1: Knot (nomenclature from Mundt et al. 1990); Cols. 2 and 3: right ascension and declination offsets from the position of HL Tau; Col. 4: proper motion velocity, assuming a distance of 140 pc; Col. 5: position angle.
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