2003AJ....125..825T

Query : 2003AJ....125..825T

2003AJ....125..825T - Astron. J., 125, 825-841 (2003/February-0)

Radial velocity survey of members and candidate members of the TW Hydrae association.

TORRES G., GUENTHER E.W., MARSCHALL L.A., NEUHAEUSER R., LATHAM D.W. and STEFANIK R.P.

Abstract (from CDS):

We report spectroscopic observations of stars belonging to the young nearby group known as the TW Hydrae association, as well as of a number of potential members of the association identified in kinematic and X-ray surveys. Multiple radial velocity measurements were obtained for each object, several of which turn out to be multiple systems. Orbital solutions are presented for three double-lined binaries, one single-lined binary, and a double-lined triple system, all with short periods. Effective temperatures and projected rotational velocities are presented for each visible object. None of the candidate members of the association in our sample are confirmed as a true member. The large fraction of close binaries among the candidate members has to do with their selection based on X-ray emission from ROSAT, which tends to favor the inclusion of tidally locked systems that are active but not necessarily young.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: Spectroscopic - open clusters and associations: individual (TW Hydrae) - Stars: Kinematics - Stars: Pre-Main-Sequence

Nomenclature: Table 1: TWA NNA (Nos 4A-B, 13A-B) added.

Simbad objects: 41

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Number of rows : 41
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 NAME Tuc Moving Group MGr 00 00 -64.0           ~ 73 0
2 NAME Horologium Association As* 02 10.0 -54 30           ~ 54 0
3 MBM 12 MoC 02 56 50 +19 32.0           ~ 230 1
4 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
5 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 2087 1
6 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
7 * 4 Sex SB* 09 50 30.0821274083 +04 20 37.136042875       6.0   F5V 92 0
8 CD-22 7788 SB* 09 59 08.4217379616 -22 39 34.501580064   11.05 9.97     K2Ve 32 0
9 BD-09 3055 SB* 10 22 17.9942164845 -10 32 15.573361499   12.15 11.01     K4+Vk 33 0
10 V* CE Ant TT* 10 42 30.1018928760 -33 40 16.229805204   12.21 10.91   9.10 M2Ve 252 1
11 RX J1100.0-3813 SB* 11 00 02.4229904952 -38 13 20.399233404   12.55 11.85     ~ 2 0
12 HD 95490 * 11 00 51.2454380904 -35 33 36.267762096   8.86 8.37     F7/8V 9 0
13 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
14 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
15 CD-29 8887 TT* 11 09 13.7928873024 -30 01 39.968872752   12.95 11.119 10.642 8.875 M2Ve 141 0
16 CD-38 6968 PM* 11 09 40.0907929752 -39 06 47.281570596   10.52 9.93     G3 12 0
17 TWA 3B TT* 11 10 27.8406509184 -37 31 52.748684904   14.59 13.70   8.86 M4Ve 63 0
18 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 218 0
19 TWA 3A TT* 11 10 27.9121410480 -37 31 51.535547940   14.04 12.57   9.10 M4Ve 221 0
20 HD 97131 SB* 11 10 34.2447505824 -30 27 18.611386380   9.17 8.80     F2V 32 1
21 CD-37 7097 * 11 12 42.8827669248 -38 31 03.644612004   10.15 9.55     F5 4 0
22 CRTS J111506.7-323247 SB* 11 15 06.8847718968 -32 32 45.891749580   12.55 11.61     ~ 4 0
23 V* V1217 Cen Or* 11 21 05.4814169256 -38 45 16.522915140   14.04 12.58 12.34 10.515 M1Ve 86 0
24 CD-34 7390A TT* 11 21 17.2193334624 -34 46 45.503251608   12.88 11.46 11.43 9.57 M1Ve 111 0
25 CD-34 7390 ** 11 21 17.24 -34 46 45.5     11.080   9.038 M1Ve+M1Ve 65 0
26 CD-34 7390B TT* 11 21 17.4430606440 -34 46 49.775810700   13.43 11.96 11.31 9.88 M1Ve 84 0
27 HD 98800B SB* 11 22 05.2890267409 -24 46 38.767455498   11.18 9.92     ~ 144 1
28 HD 98800 TT* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 401 0
29 CD-33 7795 TT* 11 31 55.2608963280 -34 36 27.203892120   12.97 11.524 11.150 9.150 M2Ve 205 0
30 CD-26 8623 TT* 11 32 41.2658824800 -26 51 55.961893800   13.69 12.23 11.14 9.637 M3Ve 118 0
31 HD 102458 Or* 11 47 24.5438206248 -49 53 03.018484572   9.70 9.07   8.40 G4V 102 0
32 CD-36 7429A TT* 11 48 24.2227406904 -37 28 49.114270524   12.54 11.17 10.92 9.552 K5V 145 0
33 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 98 0
34 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 376 0
35 CD-40 7164 * 12 13 06.9634880688 -40 56 31.595580312   10.35 9.80     G 14 0
36 CD-49 7027 Or* 12 21 55.6590902616 -49 46 12.443074608   10.81 10.001   9.050 G9V 42 0
37 CD-47 7559 Or* 12 22 04.2988090656 -48 41 24.953627940   11.34 10.618   9.562 K1Ve 32 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 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
41 HD 199143 PM* 20 55 47.6748292416 -17 06 51.061731768   7.84 7.32 8.29   F8V 133 0

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