2003ApJ...599..342S


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET13:09:08

2003ApJ...599..342S - Astrophys. J., 599, 342-350 (2003/December-2)

New members of the TW Hydrae association, β Pictoris moving group, and Tucana/Horologium association.

SONG I., ZUCKERMAN B. and BESSELL M.S.

Abstract (from CDS):

We have identified five new members of the TW Hydrae association (TWA), 11 new members of the β Pic moving group, and 11 new Tucana/Horologium association members. These are the three youngest (≲30 Myr) known kinematic stellar groups near the Earth. Newly identified β Pic group members are located mostly in the northern hemisphere, and they have a slightly different U-component of Galactic velocity compared to that of previously known members. Tracing the motion of β Pic members backward in time for 12 Myr indicates that they might have formed in a small region with an initial velocity dispersion of ∼8 km/s. A couple of mid-M spectral type β Pic members show emission features [He I λ5876+λ6678) and Na D λ5890+λ5896)] seen among earlier spectral type stars in the TWA and β Pic groups. To derive the distances of the non-Hipparcos members of these groups, we have constructed a V-K versus MKcolor-magnitude diagram that is very useful in separating young K/M stars from older main-sequence counterparts and constraining theoretical pre-main-sequence evolutionary tracks. All newly identified K- and M-type members of the three groups show saturated X-ray activity (LX/Lbol∼10–3). One newly identified TWA member, SSS 101727-5354, is estimated to be only 22 pc away from Earth. Its extreme youth, late spectral type (∼M5), and proximity to Earth make SSS 101727-5354 perhaps the best target for direct imaging detection of cooling planets.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: TW Hydrae - open clusters and associations: individual (β Pictoris, Tucana) - Stars: Evolution - Stars: Kinematics - Stars: Pre-Main-Sequence

Nomenclature: Table 1: TWA NN (Nos 21-25) added.

Errata: erratum vol. 603, p. 804 (2004)

CDS comments: Table 1: TWA numbers should have been applied only to TWA members, not to beta Pictoris moving group and Tucana-Horologium association stars.

Simbad objects: 73

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Number of rows : 73

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 NAME THA As* 00 00 -62.0           ~ 352 0
2 V* BW Phe Ro* 00 56 55.4578740900 -51 52 31.842227982   10.61 9.053   7.882 K3Ve 33 0
3 V* DK Cet Ro* 01 57 48.9776543901 -21 54 05.343324011   8.73 8.057   7.343 G4V 119 1
4 HD 14082B BY* 02 17 24.7368500111 +28 44 30.410626137   8.33 7.74     G2V 92 0
5 HD 14082 BY* 02 17 25.2869009788 +28 44 42.143559499   7.545 7.031 8.04   F5V 107 0
6 BD+30 397B PM* 02 27 28.0552831577 +30 58 40.360068027   14.05 12.55     M0 35 0
7 BD+30 397 Ro* 02 27 29.2541412466 +30 58 24.594383708   11.3 10.12 9.32 8.78 K7V 87 1
8 BD+05 378 Ro* 02 41 25.8882107790 +05 59 18.394803825   11.58 10.271   8.807 K6Ve 94 1
9 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3026 0
10 BD-15 705 Ro* 04 02 16.4850091343 -15 21 29.807209958   11.19 10.024   8.940 K3/4 31 1
11 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2697 0
12 HD 30051 PM* 04 43 17.2029571220 -23 37 42.250373187   7.51 7.11     F2/3IV/V 44 1
13 LP 476-207 ** 05 01 58.79419 +09 58 59.2855   12.93 11.53 10.33 8.708 M3.5V 102 0
14 V* AS Col RS* 05 20 38.0483050509 -39 45 17.794216843   7.89 7.38   6.81 F6V 63 1
15 V* AF Lep RS* 05 27 04.7631691589 -11 54 03.466187467   6.832 6.295     F8V(n)k: 210 0
16 V* AT Col BY* 05 37 05.2949412158 -39 32 26.475223330   10.45 9.552   8.567 K1V(e) 25 0
17 CD-34 2406 Ro* 05 42 34.220832 -34 15 42.23628   11.40 10.56 10.65 9.669 K0V 15 0
18 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1669 1
19 HD 40216 * 05 55 43.1622157600 -38 06 16.258479150   7.95 7.47     F7V 53 1
20 V* V1358 Ori BY* 06 19 08.0574744469 -03 26 20.358775839   8.52 7.95     G0V 91 1
21 HD 44627 Ro* 06 19 12.9129838711 -58 03 15.524890610   10.01 9.205   8.185 K1V(e) 140 1
22 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1602 1
23 HD 49855 Ro* 06 43 46.2458255126 -71 58 35.392002354   9.63 9.055   8.259 G6V 59 0
24 HD 55279 Ro* 07 00 30.4887886421 -79 41 45.988308717   11.12 10.084   9.014 K2V 45 1
25 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 317 0
26 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 312 0
27 HD 298936 PM* 10 13 14.7723998693 -52 30 54.000802418   10.81 9.763   8.687 K3Ve 51 0
28 TWA 22 LXB 10 17 26.8983656044 -53 54 26.459439803   15.69 13.96 13.72   M5 70 0
29 V* BX Ant TT* 10 18 28.6989165716 -31 50 02.826261802   13.39 11.454 11.382 9.325 M0Ve 103 0
30 V* CE Ant TT* 10 42 30.1021269333 -33 40 16.226774953   12.21 10.91   9.10 M2Ve 152 1
31 IC 2602 OpC 10 42 58 -64 24.0           ~ 557 0
32 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1557 1
33 NAME TW Hya Association As* 11 01.9 -34 42           ~ 829 0
34 CD-29 8887 TT* 11 09 13.8074415397 -30 01 40.070212113   12.95 11.119 10.642 8.875 M2Ve 111 0
35 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 200 0
36 TWA 3A TT* 11 10 27.9117558304 -37 31 51.529219753   14.04 12.57   9.10 M4Ve 187 0
37 V* V1215 Cen TT* 11 13 26.2208332352 -45 23 42.719174706     12.478   10.483 K8IVe 68 0
38 V* V1217 Cen BY* 11 21 05.4812165874 -38 45 16.521880972   14.04 12.58 12.34 10.515 M1Ve 64 0
39 CD-34 7390A TT* 11 21 17.2193442623 -34 46 45.500772910   12.88 11.46 11.43 9.57 M1Ve 84 0
40 CD-34 7390 ** 11 21 17.24 -34 46 45.5     11.080   9.038 M1Ve+M1Ve 56 0
41 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 333 0
42 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0
43 TWA 30 Y*O 11 32 18.3109439046 -30 19 51.860228754   15.82 14.20 14.44 11.30 M5V 55 0
44 CD-26 8623 TT* 11 32 41.2659398509 -26 51 55.961617611   13.69 12.23 11.14 9.637 M3Ve 87 0
45 HD 102458 Y*O 11 47 24.5436617458 -49 53 03.018055867   9.70 9.07   8.40 G4V 80 0
46 CD-36 7429B TT* 11 48 23.7347470027 -37 28 48.519698919   15.43 14.00   11.45 M1V 66 0
47 CD-36 7429A TT* 11 48 24.2226856081 -37 28 49.112368947   12.54 11.17 10.92 9.552 K5V 107 0
48 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 93 0
49 TWA 23 TT* 12 07 27.3753633293 -32 47 00.253618251   14.157 12.7     M2.5Ve 56 0
50 CD-58 4411 pr* 12 09 41.8588357192 -58 54 45.059820367   11.29 10.33 10.12   K1Ve 31 0
51 V* V1249 Cen TT* 12 15 30.7203284919 -39 48 42.605543199   13.09 11.160 10.919 9.50 M0.5 84 0
52 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 361 1
53 V* V1251 Cen TT* 12 34 20.6481566532 -48 15 13.530604360   13.3 12.2   11.90 M3.5 39 0
54 TWA 16 ** 12 34 56.302608 -45 38 07.63332   14.05 12.58 12.21 10.310 M2.5 52 0
55 V* V1252 Cen TT* 12 35 04.2562814902 -41 36 38.620524379   14.39 13.045   10.506 M2Ve 69 0
56 HD 109573B PM* 12 36 00.5493890939 -39 52 15.696207303         10.78 M2.5 74 0
57 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 560 1
58 V* V1267 Cen TT* 13 20 45.3877589173 -46 11 37.712461035   14.0 12.7   10.78 K5IVe 37 0
59 V* V1268 Cen TT* 13 21 37.2196798397 -44 21 51.945677621     12.952   10.965 M0.5 39 0
60 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 575 0
61 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 367 1
62 HD 139084B PM* 15 38 56.7796538592 -57 42 18.956312475     14.80 14.88 11.73 M5Ve 23 1
63 HD 139084 Ro* 15 38 57.5579600831 -57 42 27.297738209   8.78 7.977   7.106 K0V 144 0
64 HD 325367 Or* 16 03 05.4914377137 -40 18 25.426543472   11.40 8.50     M0 283 0
65 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1143 1
66 * d Sco PM* 16 18 17.9001656 -28 36 50.476788   4.804 4.782     A1Va 149 0
67 CD-43 12272 ** 18 06 49.89312 -43 25 30.7964   5.17 4.95     A6V+A7V 41 0
68 * eta Tel PM* 19 22 51.2064652963 -54 25 26.152538950   5.035 5.020   4.99 A0V+M7/8V 191 0
69 HD 186602 ** 19 49 07.30141 -61 48 54.0645   7.75 7.26     F7/8V 40 0
70 V* V390 Pav Ro* 21 21 24.4938524191 -66 54 57.380011235   9.95 8.766   7.515 K2V 52 0
71 HD 207129 PM* 21 48 15.7510673466 -47 18 13.020109072   6.18 5.58     G2V 291 0
72 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
73 V* TX PsA Er* 22 45 00.0639785115 -33 15 26.096344309   14.93 13.36 12.095 10.379 M5IVe 62 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-13:09:08

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