CDS

2002A&A...385..862S

Query : 2002A&A...385..862S

2002A&A...385..862S - Astronomy and Astrophysics, volume 385, 862-866 (2002/4-3)

Additional TWA members? Spectroscopic verification of kinematically selected TWA candidates.

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

Abstract (from CDS):

We present spectroscopic measurements of the 23 new candidate members of the TW Hydrae Association from Makarov & Fabricius (2001A&A...368..866M). Based on Hα and Li 6708Å strengths together with location on a color-magnitude diagram for Hipparcos TWA candidates, we found only three possible new members (TYC 7760-0835-1, TYC 8238-1462-1, and TYC 8234-2856-1) in addition to the already known member, TWA 19. This eliminated most of the candidates more distant than 100 pc. Three Tycho stars, almost certainly members of the Lower Centaurus Crux association, are the most distant members of the TWA. A claim of isotropic expansion of TWA has to be re-evaluated based on our new results. Generally, one cannot identify new members of a diffuse nearby stellar group based solely on kinematic data. To eliminate interlopers with similar kinematics, spectroscopic verification is essential.

Abstract Copyright: ∼

Journal keyword(s): galaxy: open clusters and associations: individual: TWA - stars: kinematics - stars: planetary systems - techniques: spectroscopic

Nomenclature: Table 1: Song N (Nos 1-3).

CDS comments: The 3 last possible TWA members in table 1 (here designated as TYC 7760-0835-1, TYC 8238-1462-1, TYC 8234-2856-1) are designated as SONG 1, SONG 2, SONG 3, in 2003AN....324..516K

Simbad objects: 42

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Number of rows : 42
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023 		#notes
1 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1856 1
2 NGC 2264 OpC 06 40 52.1 +09 52 37           ~ 1760 0
3 HD 82241 ** 09 29 28.5720467760 -44 31 56.476538508   7.467 6.973     F8VFe-0.4 49 1
4 HD 83108 PM* 09 35 11.8237490568 -35 49 25.498456104   6.895 6.470     F5V 38 0
5 * 4 Sex SB* 09 50 30.0821274083 +04 20 37.136042875       6.0   F5V 85 0
6 RX J0958.4+0850 SB* 09 58 27.1773349512 +08 50 43.657430388   10.76 10.065   9.279 ~ 5 0
7 CD-22 7788 SB* 09 59 08.4217379616 -22 39 34.501580064   11.05 9.97     K2Ve 28 0
8 * 14 Sex ** 10 06 47.4247307834 +05 36 41.373901776   7.130 6.187     K1III 43 0
9 CD-25 7777 SB* 10 08 03.5579286264 -26 36 38.535747876   11.91 11.01   10.052 K1:V: 6 0
10 TYC 7178-1493-1 PM* 10 10 46.6734963216 -34 47 53.131638192   12.29 11.53     G8:V: 6 0
11 CD-30 8307 ** 10 16 45.4364 -31 08 43.958   11.789 10.866 11.401   K3:V: 9 0
12 V* BX Ant TT* 10 18 28.6987521312 -31 50 02.830052544   13.39 11.454 11.382 9.325 M0Ve 117 0
13 CD-31 8201 LM* 10 22 04.4790255336 -32 33 26.957520576   11.25 10.129   8.872 K0V:e 13 0
14 BD-09 3055 SB* 10 22 17.98945 -10 32 15.4650   12.15 11.01     K4+Vk 31 0
15 HD 91353 Ro* 10 32 10.1951985192 -39 05 46.545648648   10.23 9.377   8.264 G9III 9 0
16 IC 2602 OpC 10 42 27.1 -64 25 34           ~ 655 0
17 V* CE Ant TT* 10 42 30.1018928760 -33 40 16.229805204   12.21 10.91   9.10 M2Ve 202 1
18 V* V419 Hya BY* 10 43 28.2715703736 -29 03 51.432666948 9.144 8.596 7.719 7.232 6.806 K1V 172 0
19 HD 93528 PM* 10 47 31.1542342536 -22 20 52.917024696   9.19 8.388   7.515 K0V 42 0
20 HD 94765 BY* 10 56 30.7993104072 +07 23 18.507477300 8.944 8.252 7.379 6.815 6.442 K0V 105 0
21 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 1849 1
22 NAME TW Hya Association As* 11 01.9 -34 42           ~ 925 0
23 CD-29 8887 TT* 11 09 13.7928873024 -30 01 39.968872752   12.95 11.119 10.642 8.875 M2Ve 128 0
24 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 211 0
25 TWA 3A TT* 11 10 27.9121410480 -37 31 51.535547940   14.04 12.57   9.10 M4Ve 208 0
26 HD 98800 TT* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 372 0
27 HD 99627 * 11 27 29.3802896784 -39 52 35.444378964   7.38 7.32     A0V 21 0
28 CD-33 7795 TT* 11 31 55.2608963280 -34 36 27.203892120   12.97 11.524 11.150 9.150 M2Ve 190 0
29 V* V752 Cen EB* 11 42 48.0813368784 -35 48 57.505663584   9.88 9.30 9.697   F7/G0(V) 81 0
30 HD 102077 BY* 11 44 38.4210169656 -49 25 02.404105608   10.04 8.917   7.831 K1V 96 0
31 TWA 19B Em* 11 47 20.5931919840 -49 53 04.336507860   13.82 12.30   10.21 K7e 30 0
32 HD 102458 Y*O 11 47 24.5438206248 -49 53 03.018484572   9.70 9.07   8.40 G4V 92 0
33 CD-36 7429A TT* 11 48 24.2227406904 -37 28 49.114270524   12.54 11.17 10.92 9.552 K5V 126 0
34 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 98 0
35 HD 105690 PM* 12 10 06.4712050176 -49 10 50.657624976   8.86 8.199   7.414 G5V 63 0
36 CD-40 7164 * 12 13 06.9634880688 -40 56 31.595580312   10.35 9.80     G 11 0
37 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 458 1
38 CD-49 7027 Y*O 12 21 55.6590902616 -49 46 12.443074608   10.81 10.001   9.050 G9V 30 0
39 CD-47 7559 Y*O 12 22 04.2988090656 -48 41 24.953627940   11.34 10.618   9.562 K1Ve 25 0
40 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 427 2
41 HD 109573 PM* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774 7.25 5.81 A0V 618 1
42 HD 141569 Y*O 15 49 57.7482550392 -03 55 16.341617064 7.22 7.20 7.12 7.00 7.04 A2VekB9mB9(_lB) 523 0

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2023.09.24-09:47:24

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