Table 1
Information on the YLAs used in our study.
| Name | Abbreviation | Num. of Members |  |
 |
 |
 |
Ū |  |
 |
|||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CSNYS | TGAS | 6D | 2σ | (pc) | (pc) | (pc) | (pc) | (km s−1) | (km s−1) | (km s−1) | ||
| ϵ Chamaeleontis | ϵ Cha | 43 | 13 | 10 | 10 | 101 ± 2 | –49 | –85 | –22 | –10.1 | –19.3 | –9.7 |
| TW Hydrae | TW Hya | 59 | 7 | 7 | 7 | 66 ± 8 | –16 | –60 | 20 | –10.9 | –20.2 | –5.6 |
| β Pictoris | β Pic | 146 | 32 | 31 | 21 | 40 ± 4 | –17 | –4 | –15 | –9.9 | –16.2 | –9.0 |
| Octans | Oct | 49 | 14 | 14 | 13 | 135 ± 7 | 9 | –100 | –61 | –13.9 | –3.6 | –10.3 |
| Tucana-Horologium | Tuc-Hor | 250 | 52 | 49 | 30 | 47 ± 1 | 0 | –22 | –35 | –9.8 | –20.9 | –1.1 |
| Columba | Col | 98 | 46 | 36 | 24 | 73 ± 5 | 29 | –48 | –37 | –12.8 | –21.8 | –5.5 |
| Carina | Car | 40 | 22 | 22 | 17 | 98 ± 9 | –8 | –94 | –17 | –10.3 | –22.8 | –4.6 |
| Argus | Arg | 142 | 46 | 44 | 25 | 125 ± 6 | –12 | –120 | –16 | –22.6 | –14.1 | –5.3 |
| AB Doradus | AB Dor | 207 | 69 | 61 | 38 | 48 ± 5 | 5 | –14 | –20 | –6.7 | –27.5 | –14.0 |
Notes. Columns indicate: (1) number of stars catalogued as members in the CSNYS (Riedel et al. 2017); (2) number of members with TGAS data; (3) number of stars with full 6D information; (4) number of remaining members after the 2σ cut in velocity space, which is the final set used to compute mean distances and heliocentric spatial and velocity components (Cols. 5 to 11). We compute the mean distance 
(Col. 5) by inverting the parallax andits uncertainty as 
.
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