2014A&A...563A.121D


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST03:41:39

2014A&A...563A.121D - Astronomy and Astrophysics, volume 563A, 121-121 (2014/3-1)

The TW Hydrae association: trigonometric parallaxes and kinematic analysis.

DUCOURANT C., TEIXEIRA R., GALLI P.A.B., LE CAMPION J.F., KRONE-MARTINS A., ZUCKERMAN B., CHAUVIN G. and SONG I.

Abstract (from CDS):

The nearby TW Hydrae association (TWA) is currently a benchmark for the study of the formation and evolution of young low-mass stars, circumstellar disks, and the imaging detection of planetary companions. For these studies, it is crucial to evaluate the distance to group members in order to access their physical properties. Membership of several stars is strongly debated and age estimates vary from one author to another with doubts about coevality. We revisit the kinematic properties of the TWA in light of new trigonometric parallaxes and proper motions to derive the dynamical age of the association and physical parameters of kinematic members. Using observations performed with the New Technology Telescope (NTT) from ESO we measured trigonometric parallaxes and proper motions for 13 stars in TWA. With the convergent point method we identify a co-moving group with 31 TWA stars. We deduce kinematic distances for seven members of the moving group that lack trigonometric parallaxes. A traceback strategy is applied to the stellar space motions of a selection of 16 of the co-moving objects with accurate and reliable data yielding a dynamical age for the association of t≃7.5 ±0.7Myr. Using our new parallaxes and photometry available in the literature we derive stellar ages and masses from theoretical evolutionary models. With new parallax and proper motion measurements from this work and current astrometric catalogs we provide an improved and accurate database for TWA stars to be used in kinematical analysis. We conclude that the dynamical age obtained via traceback strategy is consistent with previous age estimates for the TWA, and is also compatible with the average ages derived in the present paper from evolutionary models for pre-main-sequence stars.

Abstract Copyright:

Journal keyword(s): parallaxes - proper motions - brown dwarfs - open clusters and associations: individual: TW Hydrae association - stars: pre-main sequence

Simbad objects: 57

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Number of rows : 57

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 298936 PM* 10 13 14.7723998693 -52 30 54.000802418   10.81 9.763   8.687 K3Ve 46 0
2 TWA 22 LXB 10 17 26.8983656044 -53 54 26.459439803   15.69 13.96 13.72   M5 65 0
3 V* BX Ant TT* 10 18 28.6989165716 -31 50 02.826261802   13.39 11.454 11.382 9.325 M0Ve 98 0
4 TWA 34 LM* 10 28 45.7990825931 -28 30 37.527196674           M4.9(opt) 22 0
5 V* CE Ant TT* 10 42 30.1021269333 -33 40 16.226774953   12.21 10.91   9.10 M2Ve 141 1
6 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1442 1
7 NAME TW Hya Association As* 11 01.9 -34 42           ~ 795 0
8 TWA 28 BD* 11 02 09.8372483500 -34 30 35.573128437     21.46 19.14 17.90 M9gamma 62 0
9 CD-29 8887 TT* 11 09 13.8074415397 -30 01 40.070212113   12.95 11.119 10.642 8.875 M2Ve 106 0
10 TWA 3B TT* 11 10 27.80 -37 31 53.0   14.59 13.70   8.86 M4Ve 46 0
11 Hen 3-600 TT* 11 10 27.894 -37 31 51.97   13.53 12.05 11.61 9.29 M4Ve+M4Ve 195 0
12 TWA 3A TT* 11 10 28.00 -37 31 51.0   14.04 12.57   9.10 M4Ve 181 0
13 V* V1215 Cen TT* 11 13 26.2208332352 -45 23 42.719174706     12.478   10.483 K8IVe 66 0
14 V* V1217 Cen TT* 11 21 05.4812165874 -38 45 16.521880972   14.38 12.85 11.93 10.515 M1Ve 60 0
15 CD-34 7390A TT* 11 21 17.2193442623 -34 46 45.500772910   12.88 11.46 11.43 9.57 M1Ve 78 0
16 CD-34 7390 ** 11 21 17.24 -34 46 45.5     11.080   9.038 M1Ve+M1Ve 55 0
17 CD-34 7390B TT* 11 21 17.4429759333 -34 46 49.774537089   13.43 11.96 11.31 9.88 M1Ve 54 0
18 HD 98800A SB* 11 22 05.287 -24 46 39.78           ~ 23 0
19 HD 98800B SB* 11 22 05.288 -24 46 39.05           ~ 105 1
20 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.27 8.912 9.257 7.386 K5V(e) 319 0
21 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 165 0
22 CD-33 7795B BD* 11 31 55.4 -34 36 29     20.40   15.8 ~ 115 0
23 TWA 30B LM* 11 32 18.2184758367 -30 18 31.652412622         16.68 M4 28 0
24 TWA 30 Y*O 11 32 18.3109439046 -30 19 51.860228754   15.82 14.20 14.44 11.30 M5V 50 0
25 CD-26 8623B TT* 11 32 41.1729967174 -26 52 09.110626414   16.70 15.22 13.68 11.76 M5.5 62 0
26 CD-26 8623 TT* 11 32 41.2659398509 -26 51 55.961617611   13.69 12.23 11.14 9.637 M3Ve 81 0
27 TWA 33 PM* 11 39 33.8249188234 -30 40 00.366404047           M4.7(opt) 18 0
28 TWA 26 BD* 11 39 51.1435262748 -31 59 21.473337261         15.83 M9: 93 0
29 TWA 19B Em* 11 47 20.5878427409 -49 53 04.418207096   13.82 12.30   10.21 K7e 25 0
30 HD 102458 Y*O 11 47 24.5436617458 -49 53 03.018055867   9.70 9.07   8.40 G4V 74 0
31 CD-36 7429B TT* 11 48 23.7347470027 -37 28 48.519698919   15.43 14.00   11.45 M1V 61 0
32 CD-36 7429A TT* 11 48 24.2226856081 -37 28 49.112368947   12.54 11.17 10.92 9.552 K5V 101 0
33 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 91 0
34 TWA 31 PM* 12 07 10.8878369580 -32 30 53.757769890   18.5   16.4   M4.2 20 0
35 TWA 23 TT* 12 07 27.3753633293 -32 47 00.253618251   14.157 12.7     M2.5Ve 52 0
36 TWA 27 BD* 12 07 33.467 -39 32 54.00     19.95 17.99 15.88 M8Ve 303 1
37 TWA 27B BD* 12 07 33.50 -39 32 54.4           L5 226 1
38 CD-58 4411 pr* 12 09 41.8591 -58 54 45.066   11.17 10.09     K1Ve 28 0
39 V* V1249 Cen TT* 12 15 30.7203284919 -39 48 42.605543199   13.09 11.160 10.919 9.50 M0.5 77 0
40 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 334 1
41 TWA 32 ** 12 26 51.366576 -33 16 12.54324   17.21 16.00 15.73   M6.3 23 0
42 TWA 20 Ro* 12 31 38.0691558062 -45 58 59.456934871   14.10 13.240   10.682 M3IVe 41 0
43 TWA 15 ** 12 34 20.1 -48 15 14     14.0     M2 13 1
44 V* V1250 Cen TT* 12 34 20.4718890806 -48 15 19.545698484   13.3 12.2   11.80 M3 32 0
45 V* V1251 Cen TT* 12 34 20.6481566533 -48 15 13.530604360   13.3 12.2   11.90 M3.5 37 0
46 TWA 16 ** 12 34 56.302608 -45 38 07.63332   14.05 12.58 12.21 10.310 M2.5 50 0
47 V* V1252 Cen TT* 12 35 04.2562814903 -41 36 38.620524379   14.39 13.045   10.506 M2Ve 67 0
48 TWA 11C PM* 12 35 48.9385574403 -39 50 24.567547160   15.94 14.43 14.07   ~ 24 0
49 HD 109573B PM* 12 36 00.5493890939 -39 52 15.696207303         10.78 M2.5 73 0
50 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 535 1
51 TWA 29 BD? 12 45 14.1609543807 -44 29 07.737190128         18.0 M9.5p 39 0
52 V* V1267 Cen TT* 13 20 45.3877589173 -46 11 37.712461035   14.0 12.7   10.78 K5IVe 36 0
53 V* V1268 Cen TT* 13 21 37.2196798397 -44 21 51.945677621     12.952   10.965 M0.5 39 0
54 HD 139084 BY* 15 38 57.5579600831 -57 42 27.297738209   8.78 7.977   7.106 K0V 139 0
55 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1078 1
56 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 10997 0
57 V* NX Aqr BY* 23 24 06.3371228961 -07 33 02.727855753   8.32 7.61     G5V 40 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-03:41:39

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