2009A&A...503..281T


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET22:05:07

2009A&A...503..281T - Astronomy and Astrophysics, volume 503, 281-285 (2009/8-3)

Kinematic analysis and membership status of TWA 22 AB.

TEIXEIRA R., DUCOURANT C., CHAUVIN G., KRONE-MARTINS A., BONNEFOY M. and SONG I.

Abstract (from CDS):

TWA22 was initially regarded as a member of the TW Hydrae association (TWA). In addition to being one of the youngest (≃8Myr) and nearest (≃20pc) stars to Earth, TWA22 has proven to be very interesting after being resolved as a tight, very low-mass binary. This binary can serve as a very useful dynamical calibrator for pre-main sequence evolutionary models. However, its membership in the TWA has been recently questioned despite due to the lack of accurate kinematic measurements. Based on proper motion, radial velocity, and trigonometric parallax measurements, we aim here to re-analyze the membership of TWA22 to young, nearby associations. Using the ESO NTT/SUSI2 telescope, we observed TWA22AB during 5 different observing runs over 1.2 years to measure its trigonometric parallax and proper motion. This is a part of a larger project measuring trigonometric parallaxes and proper motions of most known TWA members at a sub-milliarcsec level. HARPS at the ESO 3.6m telescope was also used to measure the system's radial velocity over 2 years. We report an absolute trigonometric parallax of TWA22AB, π=57.0±0.7mas, corresponding to a distance 17.5±0.2pc from Earth. Measured proper motions of TWA 22AB are µαcos(δ)=-175.8±0.8mas/yr and µδ=-21.3±0.8mas/yr. Finally, from HARPS measurements, we obtain a radial velocity Vrad=14.8±2.1km/s. A kinematic analysis of TWA22AB space motion and position implies that a membership of TWA22AB to known young, nearby associations can be excluded except for the β Pictoris and TW Hydrae associations. Membership probabilities based on the system's Galactic space motion and/or the trace-back technique support a higher chance of being a member to the β Pictoris association. Membership of TWA22 in the TWA cannot be fully excluded because of large uncertainties in parallax measurements and radial velocities and to the uncertain internal velocity dispersion of its members.

Abstract Copyright:

Journal keyword(s): astrometry - stars: binaries: close - stars: distances - Galaxy: open clusters and associations: general - solar neighborhood - Galaxy: open clusters and associations: individual: TWA22AB

Simbad objects: 56

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Number of rows : 56

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME THA As* 00 00 -62.0           ~ 359 0
2 HD 105 PM* 00 05 52.5449273706 -41 45 11.046016405   8.13 7.53     G0V 155 0
3 HD 987 Ro* 00 13 53.0105874824 -74 41 17.851248731   9.48 8.724   7.933 G8V 82 0
4 HD 1466 PM* 00 18 26.1235227218 -63 28 38.981281995   8.00 7.46     F8V 94 0
5 * bet01 Tuc ** 00 31 32.6680740 -62 57 29.587487   4.249 4.289     B9.5Va 106 0
6 * bet02 Tuc ** 00 31 33.4223046159 -62 57 56.133914894   4.649 4.514     A3IV 93 0
7 * bet03 Tuc ** 00 32 43.9055907013 -63 01 53.397968811 5.15 5.13 5.09     A0V 114 0
8 HD 3221 Ro* 00 34 51.2019905484 -61 54 58.129778039   10.83 9.604   8.238 K4Ve 69 0
9 V* DK Cet Ro* 01 57 48.9776543901 -21 54 05.343324011   8.73 8.057   7.343 G4V 119 1
10 HD 14082B BY* 02 17 24.7368500111 +28 44 30.410626137   8.33 7.74     G2V 92 0
11 HD 14082 BY* 02 17 25.2869009788 +28 44 42.143559499   7.545 7.031 8.04   F5V 107 0
12 BD+30 397 Ro* 02 27 29.2541412466 +30 58 24.594383708   11.3 10.12 9.32 8.78 K7V 87 1
13 * eps Hyi PM* 02 39 35.3612092 -68 16 01.010320 3.91 4.047 4.096     B9Va 109 0
14 BD+05 378 Ro* 02 41 25.8882107790 +05 59 18.394803825   11.58 10.271   8.807 K6Ve 94 1
15 HD 22705 ** 03 36 53.4042467439 -49 57 28.854992249   8.22 7.62   6.96 G2V 62 0
16 * 51 Eri PM* 04 37 36.1323118067 -02 28 24.778826936   5.486 5.209     F0IV 175 0
17 GJ 3305 TT* 04 37 37.4507041928 -02 29 28.869007822   12.04 10.59   8.59 M1.1V 107 0
18 HD 30051 PM* 04 43 17.2029571220 -23 37 42.250373187   7.51 7.11     F2/3IV/V 44 1
19 V* V1005 Ori BY* 04 59 34.8341800543 +01 47 00.672080375   11.48 10.107 9.603 8.239 M0Ve 306 0
20 CD-57 1054 PM* 05 00 47.1300124315 -57 15 25.453371912   11.36 9.977 9.889 8.177 M0Ve 92 0
21 LP 476-207 ** 05 01 58.79419 +09 58 59.2855   12.93 11.53 10.33 8.708 M3.5V 102 0
22 V* AF Lep RS* 05 27 04.7631691589 -11 54 03.466187467   6.832 6.295     F8V(n)k: 211 0
23 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1678 1
24 V* AO Men Ro* 06 18 28.2084971476 -72 02 41.446399943   11.06 9.809 9.299 8.456 K4Ve 116 0
25 TWA 22 LXB 10 17 26.8983656044 -53 54 26.459439803   15.69 13.96 13.72   M5 70 0
26 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1571 1
27 NAME TW Hya Association As* 11 01.9 -34 42           ~ 830 0
28 TWA 28 LM* 11 02 09.8372483500 -34 30 35.573128437     21.46 19.14 17.90 M8.3 63 0
29 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 333 0
30 HD 102458 Y*O 11 47 24.5436617458 -49 53 03.018055867   9.70 9.07   8.40 G4V 80 0
31 CD-36 7429A TT* 11 48 24.2226856081 -37 28 49.112368947   12.54 11.17 10.92 9.552 K5V 108 0
32 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 93 0
33 TWA 27 LM* 12 07 33.4676156527 -39 32 54.016042897     19.95 17.99 15.88 M8IVe 312 0
34 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 560 1
35 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 582 0
36 HD 139084B PM* 15 38 56.7796538592 -57 42 18.956312475     14.80 14.88 11.73 M5Ve 23 1
37 HD 139084 Ro* 15 38 57.5579600831 -57 42 27.297738209   8.78 7.977   7.106 K0V 144 0
38 HD 155555 RS* 17 17 25.5047544575 -66 57 03.732827572 7.795 7.499 6.723   6.39 K1Vp 252 2
39 HD 155555C Y*? 17 17 31.2880553026 -66 57 05.472249501   14.36 12.82 12.33   M3Ve 61 1
40 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11835 0
41 HD 164249 PM* 18 03 03.4097129717 -51 38 56.434160321   7.438 7.007 7.90   F6V 96 0
42 HD 164249B PM* 18 03 04.1014030680 -51 38 56.191888973     12.50     M2Ve 14 0
43 HD 168210 EB* 18 19 52.2107643808 -29 16 32.832099665   9.44 8.844 8.505 8.132 G5V 36 0
44 HD 172555 PM* 18 45 26.9004853 -64 52 16.539796   4.967 4.767     A7V 239 0
45 CD-64 1208 ** 18 45 36.903120 -64 51 47.31228   10.52 9.433 9.69   K5Ve 59 0
46 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 291 0
47 * eta Tel PM* 19 22 51.2064652963 -54 25 26.152538950   5.035 5.020   4.99 A0V+M7/8V 192 0
48 HD 181327 PM* 19 22 58.9434412361 -54 32 16.979671096   7.50 7.04   6.49 F6V 234 0
49 * alf Pav SB* 20 25 38.85705 -56 44 06.3230 1.03 1.791 1.918     B2IV 273 0
50 V* AT Mic Er* 20 41 51.15925 -32 26 06.8283 12.753 11.909 10.343 9.098 7.383 M4.5Ve+M4.5Ve 330 0
51 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 912 0
52 HD 202917 Ro* 21 20 49.9575453387 -53 02 03.157635940   9.32 8.67   7.882 G7V 142 0
53 HD 207575 PM* 21 52 09.7248951966 -62 03 08.508117999   7.72 7.23     F6V 64 0
54 HD 207964 ** 21 55 11.39417 -61 53 11.7947   6.37 5.96     F0(V)+F5(V) 79 1
55 V* WW PsA BY* 22 44 57.9628865248 -33 15 01.745813330 14.583 13.627 12.111 10.916 9.109 M4IVe 95 1
56 HD 222259 RS* 23 39 39.48044 -69 11 44.7051   9.19 8.226   7.352 G6V+K3Ve 80 0

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2020.11.30-22:05:07

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