2013ApJ...762..118W

Query : 2013ApJ...762..118W

2013ApJ...762..118W - Astrophys. J., 762, 118 (2013/January-2)

Distance and kinematics of the TW Hydrae association from parallaxes.

WEINBERGER A.J., ANGLADA-ESCUDE G. and BOSS A.P.

Abstract (from CDS):

From common proper motion and signatures of youth, researchers have identified about 30 members of a putative TW Hydrae Association. Only four of these had parallactic distances from Hipparcos. We have measured parallaxes and proper motions for 14 primary members. We combine these with literature values of radial velocities to show that the Galactic space motions of the stars, with the exception of TWA 9 and 22, are parallel and do not indicate convergence at a common formation point sometime in the last few million years. The space motions of TWA 9 and 22 do not agree with the others and indicate that they are not TWA members. The median parallax is 18 mas or 56 pc. We further analyze the stars' absolute magnitudes on pre-main-sequence evolutionary tracks and find a range of ages with a median of 10.1 Myr and no correlation between age and Galactic location. The TWA stars may have formed from an extended and filamentary molecular cloud but are not necessarily precisely coeval.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: TW Hydrae - stars: distances - stars: kinematics and dynamics - stars: pre-main sequence

Errata: erratum vol. 767, art. 96 (2013)

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 298936 PM* 10 13 14.7724609728 -52 30 54.001503468   10.81 9.763   8.687 K3Ve 69 0
2 TWA 22 ** 10 17 26.8927745040 -53 54 26.387425044   15.686 13.960 13.724   M5 93 0
3 V* BX Ant TT* 10 18 28.6987521312 -31 50 02.830052544   13.39 11.454 11.382 9.325 M0Ve 130 0
4 V* CE Ant TT* 10 42 30.1018928760 -33 40 16.229805204   12.21 10.91   9.10 M2Ve 252 1
5 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
6 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
7 TWA 28 LM* 11 02 09.8378779824 -34 30 35.562199176     21.46 19.14 17.90 M8.3 91 0
8 CD-29 8887 TT* 11 09 13.7928873024 -30 01 39.968872752   12.95 11.119 10.642 8.875 M2Ve 141 0
9 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 218 0
10 V* V1215 Cen TT* 11 13 26.2208680752 -45 23 42.720964188     12.478   10.483 K8IVe 89 0
11 V* V1217 Cen Or* 11 21 05.4814169256 -38 45 16.522915140   14.04 12.58 12.34 10.515 M1Ve 86 0
12 CD-34 7390A TT* 11 21 17.2193334624 -34 46 45.503251608   12.88 11.46 11.43 9.57 M1Ve 111 0
13 CD-34 7390 ** 11 21 17.24 -34 46 45.5     11.080   9.038 M1Ve+M1Ve 65 0
14 CD-34 7390B TT* 11 21 17.4430606440 -34 46 49.775810700   13.43 11.96 11.31 9.88 M1Ve 84 0
15 HD 98800A Or* 11 22 05.2837180661 -24 46 39.857899212   10.63 9.46     ~ 36 0
16 HD 98800B SB* 11 22 05.2890267409 -24 46 38.767455498   11.18 9.92     ~ 144 1
17 HD 98800 TT* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 401 0
18 CD-33 7795B LM* 11 31 55.2565351569 -34 36 25.242585993     20.40   15.8 M8.5/9e 131 0
19 CD-33 7795 TT* 11 31 55.2608963280 -34 36 27.203892120   12.97 11.524 11.150 9.150 M2Ve 205 0
20 TWA 30 Y*O 11 32 18.3115839696 -30 19 51.857770620       14.205 11.30 M5V 75 0
21 TWA 26 LM* 11 39 51.1378374696 -31 59 21.443660124         15.83 M8e 125 0
22 CD-36 7429B TT* 11 48 23.7348035520 -37 28 48.520414812   15.43 14.00   11.45 M1V 93 0
23 CD-36 7429A TT* 11 48 24.2227406904 -37 28 49.114270524   12.54 11.17 10.92 9.552 K5V 145 0
24 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 98 0
25 TWA 31 PM* 12 07 10.8883274664 -32 30 53.755860744   18.5   16.4   M4.2 28 0
26 TWA 23 TT* 12 07 27.3763935312 -32 47 00.242923776   14.157 12.638 12.273   M2.5Ve 75 0
27 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 376 0
28 V* V1249 Cen TT* 12 15 30.7203201048 -39 48 42.606684144   13.09 11.160 10.919 9.50 M0.5 139 0
29 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
30 TWA 32 ** 12 26 51.366576 -33 16 12.54324   17.21 16.00 15.73   M6.3 32 0
31 TWA 20 Or* 12 31 38.0691576600 -45 58 59.457923688   14.10 13.240   10.682 M3IVe 58 0
32 V* V1250 Cen TT* 12 34 20.4720080040 -48 15 19.545583716   13.3 12.2   11.80 M3 44 0
33 V* V1251 Cen TT* 12 34 20.6481372456 -48 15 13.531352148   13.3 12.2   11.90 M3.5 50 0
34 1RXS J123420.1-481514 ** 12 34 20.65 -48 15 13.6           M3.0 16 0
35 TWA 16 ** 12 34 56.302608 -45 38 07.63332   14.05 12.58 12.21 10.310 M2.5 56 0
36 V* V1252 Cen TT* 12 35 04.2560376888 -41 36 38.616010560   14.39 13.045   10.506 M2Ve 90 0
37 TWA 11C Y*? 12 35 48.9396090720 -39 50 24.567159768   15.94 14.43 14.07   ~ 38 0
38 HD 109573B Or* 12 36 00.5491381248 -39 52 15.693558816         10.78 M2.5 91 0
39 HD 109573 TT* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774   5.81 A0V 684 1
40 TWA 29 BD* 12 45 14.1607780560 -44 29 07.728263340         18.0 L1.0 60 0
41 V* V1267 Cen TT* 13 20 45.3877266600 -46 11 37.711450572   14.0 12.7   10.78 K5IVe 49 0
42 V* V1268 Cen TT* 13 21 37.2192317688 -44 21 51.861714228     12.952   10.965 M0.5 45 0
43 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
44 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1

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