Table 3
Selected astrometric data for the 34 TWA stars (and stellar systems).
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | |
| Star | α | δ | σ α | σ δ | μαcosδ | μ δ | Ref. | V r | Ref. | π | Ref. | CP | Traceback | |
| (h:m:s) | (°′′′) | (mas) | (mas) | (mas/yr) | (mas/yr) | (km s-1) | (mas) | Member. | Age deter. | |||||
|
|
||||||||||||||
| TWA 1 | 11 01 51.905 | –34 42 17.03 | 05 | 04 | –73.4 ± 2.3 | –17.5 ± 2.3 | 1 | 12.66 ± 0.22 | 7 | 18.6 ± 2.1 | 12 | Y | + | |
| TWA 2 | 11 09 13.798 | –30 01 39.88 | 16 | 13 | –88.4 ± 1.0 | –21.2 ± 0.8 | 2 | 10.58 ± 0.51 | 8 | 24.0 ± 4.8 | 3 | Y | + | |
| TWA 3 | 11 10 27.894 | –37 31 51.97 | 14 | 15 | –105.9 ± 0.9 | –17.3 ± 1.0 | 2 | 9.52 ± 0.86 | 8 | 28.3 ± 1.6* | 3 | Y | + | |
| TWA 4 | 11 22 05.288 | –24 46 39.74 | 04 | 18 | –91.7 ± 1.6 | –31.1 ± 1.4 | 1 | 9.20 ± 0.10 | 7 | 22.3 ± 2.3 | 12 | Y | + | |
| TWA 5 | 11 31 55.260 | –34 36 27.25 | 10 | 12 | –79.6 ± 0.8 | –22.6 ± 0.9 | 2 | 13.30 ± 2.00 | 8 | 20.5 ± 2.4 | 3 | Y | r | |
| TWA 6 | 10 18 28.701 | –31 50 02.86 | 14 | 12 | –55.0 ± 1.2 | –19.8 ± 1.0 | 2 | 16.90 ± 5.00 | 15 | 14.9 ± 4.4* | 3 | Y | r | |
| TWA 7 | 10 42 30.100 | –33 40 16.28 | 128 | 63 | –114.4 ± 0.8 | –19.1 ± 0.8 | 3 | 12.21 ± 0.24 | 8 | 29.0 ±2.1 | 3 | Y | + | |
| TWA 8A | 11 32 41.263 | –26 51 55.99 | 09 | 09 | –90.6 ± 0.9 | –32.1 ± 0.8 | 4 | 8.34 ± 0.48 | 8 | 23.4 ± 2.0 | 3 | Y | + | |
| TWA 8B | 11 32 41.172 | –26 52 09.13 | 33 | 78 | –93.2 ± 1.3 | –27.5 ± 1.2 | 4 | 8.93 ± 0.27 | 8 | 25.9 ± 2.0 | 3 | Y | + | |
| TWA 9A | 11 48 24.229 | –37 28 49.11 | 06 | 03 | –55.4 ± 2.3 | –17.7 ± 2.3 | 1 | 9.46 ± 0.38 | 7 | 21.4 ± 2.5 | 12 | Y | r | |
| TWA 9B | 11 48 23.732 | –37 28 48.50 | 27 | 27 | –51.0 ± 0.6 | –18.1 ± 0.6 | 3 | 11.30 ± 2.00 | 15 | 19.2 ± 1.1 | 3 | Y | r | |
| TWA 10 | 12 35 04.254 | –41 36 38.64 | 16 | 14 | –64.6 ± 0.4 | –30.3 ± 0.4 | 3 | 6.75 ± 0.40 | 8 | 16.2 ± 1.0 | 3 | Y? | – | |
| TWA 11A | 12 36 01.031 | –39 52 10.23 | 02 | 02 | –53.3 ± 1.3 | –21.2 ± 1.1 | 1 | 9.40 ± 2.30 | 7 | 13.7 ± 0.3 | 12 | Y | + | |
| TWA 11B | 12 36 01.031 | –39 52 10.23 | 02 | 02 | .......... | .......... | – | 9.00 ± 1.00 | 7 | .......... | – | Y | – | |
| TWA 11C | 12 35 48.939 | –39 50 24.50 | 26 | 26 | –48.6 ± 1.7 | –21.3 ± 1.6 | 2 | .......... | – | 14.5 ± 0.5 | 5 | Y | – | |
| TWA 12 | 11 21 05.484 | –38 45 16.51 | 16 | 17 | –66.6 ± 1.5 | –11.7 ± 1.5 | 2 | 13.12 ± 1.59 | 8 | 15.4 ± 1.7 | 3 | Y | + | |
| TWA 13A | 11 21 17.219 | –34 46 45.47 | 13 | 16 | –66.4 ± 2.4 | –12.5 ± 1.8 | 5 | 11.67 ± 0.64 | 7 | 18.0 ± 0.7 | 5 | Y | + | |
| TWA 13B | 11 21 17.446 | –34 46 49.83 | 13 | 16 | –68.0 ± 3.1 | –11.0 ± 2.7 | 5 | 12.57 ± 0.50 | 7 | 16.8 ± 0.7 | 5 | Y | + | |
| TWA 14 | 11 13 26.221 | –45 23 42.75 | 14 | 14 | –43.9 ± 1.4 | –7.4 ± 1.4 | 2 | 15.83 ± 2.00 | 8 | 10.4 ± 1.2 | 5 | Y | + | |
| TWA 15A | 12 34 20.649 | –48 15 13.48 | 17 | 17 | –37.5 ± 2.4 | –10.4 ± 2.0 | 5 | 11.20 ± 2.00 | 15 | 9.1 ± 1.7 | 5 | Y | + | |
| TWA 15B | 12 34 20.473 | –48 15 19.59 | 22 | 17 | –36.5 ± 2.9 | –9.9 ± 2.8 | 5 | 10.03 ± 1.66 | 8 | 8.6 ± 1.6 | 5 | Y | + | |
| TWA 16 | 12 34 56.303 | –45 38 07.63 | 18 | 11 | –47.5 ± 1.3 | –20.2 ± 0.8 | 2 | 9.01 ± 0.42 | 8 | 12.8 ± 0.5 | 5 | Y? | – | |
| TWA 17 | 13 20 45.388 | –46 11 37.72 | 16 | 10 | –31.3 ± 1.1 | –17.7 ± 1.0 | 2 | 4.60 ± 6.00 | 15 | .......... | – | N | – | |
| TWA 18 | 13 21 37.225 | –44 21 51.84 | 14 | 14 | –32.1 ± 1.1 | –20.4 ± 1.1 | 2 | 6.90 ± 3.00 | 15 | .......... | – | N | – | |
| TWA 19A | 11 47 24.545 | –49 53 03.01 | 03 | 03 | –33.7 ± 1.1 | –9.1 ± 1.1 | 1 | 11.50 ± 3.80 | 7 | 10.9 ± 1.3 | 12 | N | – | |
| TWA 19B | 11 47 20.642 | –49 53 04.31 | 44 | 47 | –21.6 ± 1.7 | –23.4 ± 1.6 | 4 | 15.20 ± 2.00 | 15 | .......... | – | N | – | |
| TWA 20 | 12 31 38.068 | –45 58 59.47 | 12 | 12 | –63.5 ± 1.1 | –27.8 ± 1.1 | 2 | 8.10 ± 4.00 | 15 | 12.9 ± 0.6 | 5 | Y? | – | |
| TWA 21 | 10 13 14.774 | –52 30 53.95 | 16 | 10 | –60.9 ± 1.5 | 13.9 ± 0.8 | 2 | 17.50 ± 0.80 | 10 | 19.8 ± 1.4 | 3 | Y | r | |
| TWA 22 | 10 17 26.905 | –53 54 26.42 | 18 | 18 | –175.8 ± 0.8 | –21.3 ± 0.8 | 13 | 13.57 ± 0.26 | 8 | 57.0 ± 0.7 | 13 | N | – | |
| TWA 23 | 12 07 27.377 | –32 47 00.25 | 18 | 15 | –75.8 ± 0.9 | –25.7 ± 0.9 | 3 | 8.52 ± 1.20 | 8 | 20.6 ± 1.8 | 3 | Y | + | |
| TWA 24 | 12 09 41.861 | –58 54 45.08 | 12 | 18 | –35.2 ± 1.8 | –14.9 ± 2.1 | 2 | 11.90 ± 0.90 | 10 | .......... | – | N | – | |
| TWA 25 | 12 15 30.723 | –39 48 42.59 | 12 | 13 | –73.2 ± 0.8 | –27.7 ± 0.8 | 2 | 9.20 ± 2.10 | 10 | 18.5 ± 1.2 | 5 | Y? | – | |
| TWA 26 | 11 39 51.140 | –31 59 21.50 | 60 | 60 | –93.3 ± 0.5 | –27.5 ± 0.5 | 3 | 11.60 ± 2.00 | 14 | 26.2 ± 1.1 | 3 | Y | r | |
| TWA 27 | 12 07 33.467 | –39 32 54.00 | 60 | 60 | –64.2 ± 0.4 | –22.6 ± 0.4 | 3 | 11.02 ± 2.00 | 14 | 19.1 ± 0.4 | 3 | Y | r | |
| TWA 28 | 11 02 09.833 | –34 30 35.53 | 60 | 60 | –67.2 ± 0.6 | –14.0 ± 0.6 | 13 | .......... | - | 18.1 ± 0.5 | 13 | Y | – | |
| TWA 29 | 12 45 13.798 | –44 28 47.63 | 44 | 38 | –71.0 ± 7.0 | –23.0 ± 3.0 | 3 | .......... | - | 12.7 ± 2.1 | 5 | Y | – | |
| TWA 30A | 11 32 18.315 | –30 19 51.85 | 20 | 20 | –87.8 ± 1.3 | –25.2 ± 1.3 | 2 | 12.30 ± 1.50 | 11 | 18.0 ± 2.2* | 3 | Y | r | |
| TWA 30B | 11 32 16.921 | –30 18 10.53 | 21 | 21 | –83.0 ± 9.0 | –30.0 ± 9.0 | 11 | 12.00 ± 3.00 | 11 | 17.8 ± 4.8* | 3 | Y | r | |
| TWA 31 | 12 07 16.547 | –32 30 22.36 | 10 | 10 | –42.0 ± 6.0 | –36.0 ± 3.0 | 6 | 10.47 ± 0.41 | 8 | .......... | – | N | – | |
| TWA 32 | 12 26 51.367 | –33 16 12.54 | 32 | 79 | –59.7 ± 2.4 | –22.9 ± 2.2 | 4 | 7.15 ± 0.26 | 8 | 13.0 ± 0.7* | 3 | Y | + | |
| TWA 33 | 11 39 33.846 | –30 40 00.34 | 50 | 45 | –73.3 ± 2.9 | –25.4 ± 2.6 | 4 | .......... | – | 19.0 ± 1.2* | 3 | Y | – | |
| TWA 34 | 10 28 45.790 | –28 30 37.53 | 38 | 35 | –68.6 ± 2.7 | –11.4 ± 2.5 | 4 | .......... | – | 20.0 ± 1.3* | 3 | Y | – | |
Notes. In Cols. 2–5 we provide for each star its position (epoch = 2000.0) from UCAC4 whenever available otherwise from SPM4 or 2MASS. The proper motion, radial velocity, parallax, and the corresponding references are given in Cols. 6–12. Parallaxes with a “*” symbol are kinematic parallaxes derived in Sect. 4.3. Column 13 gives the membership status derived from the CP search method (Y = member, N = non-member, Y? = possible member) as defined in Sect. 4.4. Column 14 summarizes the participation of CP members to the traceback age determination (see Sect. 5.2 for details) (+ = participation, r = rejected, –: not member or lack of data).
Reference. (1) Tycho-2 (Høg et al. 2000); (2) UCAC4 (Zacharias et al. 2013); (3) This paper or Ducourant et al. (2008); (4) SPM4 (Girard et al. 2011); (5) Weinberger et al. (2013); (6) Schneider et al. (2012a); (7) Torres et al. (2003); (8) Shkolnik et al. (2011); (9) Torres et al. (2008); (10) Song et al. (2003); (11) Looper et al. (2010a,b); (12) Hipparcos (van Leeuwen 2007); (13) Teixeira et al. (2008, 2009); (14) Mohanty et al. (2003); (15) Reid (2003).
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