2013ApJ...762..118W


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST16:18:40

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 - 2020
#notes
1 HD 298936 PM* 10 13 14.7723998693 -52 30 54.000802418   10.81 9.763   8.687 K3Ve 51 0
2 TWA 22 LXB 10 17 26.8983656044 -53 54 26.459439803   15.69 13.96 13.72   M5 70 0
3 V* BX Ant TT* 10 18 28.6989165716 -31 50 02.826261802   13.39 11.454 11.382 9.325 M0Ve 103 0
4 V* CE Ant TT* 10 42 30.1021269333 -33 40 16.226774953   12.21 10.91   9.10 M2Ve 152 1
5 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1554 1
6 NAME TW Hya Association As* 11 01.9 -34 42           ~ 826 0
7 TWA 28 LM* 11 02 09.8372483500 -34 30 35.573128437     21.46 19.14 17.90 M8.3 63 0
8 CD-29 8887 TT* 11 09 13.8074415397 -30 01 40.070212113   12.95 11.119 10.642 8.875 M2Ve 111 0
9 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 200 0
10 V* V1215 Cen TT* 11 13 26.2208332352 -45 23 42.719174706     12.478   10.483 K8IVe 68 0
11 V* V1217 Cen BY* 11 21 05.4812165874 -38 45 16.521880972   14.04 12.58 12.34 10.515 M1Ve 64 0
12 CD-34 7390A TT* 11 21 17.2193442623 -34 46 45.500772910   12.88 11.46 11.43 9.57 M1Ve 83 0
13 CD-34 7390 ** 11 21 17.24 -34 46 45.5     11.080   9.038 M1Ve+M1Ve 56 0
14 CD-34 7390B TT* 11 21 17.4429759333 -34 46 49.774537089   13.43 11.96 11.31 9.88 M1Ve 57 0
15 HD 98800A SB* 11 22 05.286726 -24 46 39.77766   10.63 9.46     ~ 24 0
16 HD 98800B SB* 11 22 05.288454 -24 46 39.04974   11.18 9.92     ~ 111 1
17 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 333 0
18 CD-33 7795B LM* 11 31 55.2500 -34 36 25.200     20.40   15.8 M8.5/9e 118 0
19 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0
20 TWA 30 Y*O 11 32 18.3109439046 -30 19 51.860228754   15.82 14.20 14.44 11.30 M5V 55 0
21 TWA 26 LM* 11 39 51.1435262748 -31 59 21.473337261         15.83 M8e 97 0
22 CD-36 7429B TT* 11 48 23.7347470027 -37 28 48.519698919   15.43 14.00   11.45 M1V 66 0
23 CD-36 7429A TT* 11 48 24.2226856081 -37 28 49.112368947   12.54 11.17 10.92 9.552 K5V 107 0
24 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 93 0
25 TWA 31 PM* 12 07 10.8878369580 -32 30 53.757769890   18.5   16.4   M4.2 22 0
26 TWA 23 TT* 12 07 27.3753633293 -32 47 00.253618251   14.157 12.7     M2.5Ve 56 0
27 TWA 27 LM* 12 07 33.4676156527 -39 32 54.016042897     19.95 17.99 15.88 M8IVe 311 0
28 V* V1249 Cen TT* 12 15 30.7203284919 -39 48 42.605543199   13.09 11.160 10.919 9.50 M0.5 84 0
29 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 361 1
30 TWA 32 ** 12 26 51.366576 -33 16 12.54324   17.21 16.00 15.73   M6.3 26 0
31 TWA 20 Ro* 12 31 38.0691558062 -45 58 59.456934871   14.10 13.240   10.682 M3IVe 43 0
32 V* V1250 Cen TT* 12 34 20.4718890806 -48 15 19.545698484   13.3 12.2   11.80 M3 34 0
33 V* V1251 Cen TT* 12 34 20.6481566533 -48 15 13.530604360   13.3 12.2   11.90 M3.5 39 0
34 1RXS J123420.1-481514 ** 12 34 20.65 -48 15 13.6           ~ 13 0
35 TWA 16 ** 12 34 56.302608 -45 38 07.63332   14.05 12.58 12.21 10.310 M2.5 52 0
36 V* V1252 Cen TT* 12 35 04.2562814903 -41 36 38.620524379   14.39 13.045   10.506 M2Ve 69 0
37 TWA 11C PM* 12 35 48.9385574403 -39 50 24.567547160   15.94 14.43 14.07   ~ 27 0
38 HD 109573B PM* 12 36 00.5493890939 -39 52 15.696207303         10.78 M2.5 74 0
39 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 560 1
40 TWA 29 LM* 12 45 14.1609543807 -44 29 07.737190128         18.0 M9.5p 42 0
41 V* V1267 Cen TT* 13 20 45.3877589173 -46 11 37.712461035   14.0 12.7   10.78 K5IVe 37 0
42 V* V1268 Cen TT* 13 21 37.2196798397 -44 21 51.945677621     12.952   10.965 M0.5 39 0
43 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 366 1
44 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1140 1

    Equat.    Gal    SGal    Ecl

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2020.10.21-16:18:40

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