2006A&A...459..511B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET10:24:49

2006A&A...459..511B - Astronomy and Astrophysics, volume 459, 511-518 (2006/11-4)

On the age of the TW Hydrae association and 2M1207334-393254.

BARRADO Y NAVASCUES D.

Abstract (from CDS):

We have estimated the age of the young moving group TW Hydrae Association, a cohort of a few dozen stars and brown dwarfs located near the Sun which share the same kinematic properties and, presumably, the same origin and age. The chronology has been determined by analyzing different properties (magnitudes, colors, activity, lithium) of its members and comparing them with several well-known star forming regions and open clusters, as well as theoretical models. In addition, by using medium-resolution optical spectra of two M8 members of the association (2M1139 and 2M1207 - an accreting brown dwarf with a planetary mass companion), we have derived spectral types and measured Hα and lithium equivalent widths. We have also estimated their effective temperature and gravity, which were used to produce an independent age estimation for these two brown dwarfs. We have also collected spectra of 2M1315, a candidate member with a L5 spectral type and measured its Hα equivalent width. Our age estimate for the association, 10+10–7Myr, agrees with previous values cited in the literature. In the case of the two brown dwarfs, we have derived an age of 15+15–10Myr, which also agree with our estimate for the whole group. We compared our results with recent articles published on the same subject using other techniques, and discuss the limits of the age-dating techniques.

Abstract Copyright:

Journal keyword(s): Galaxy: open clusters and associations: individual: TW Hydrae Association - stars: low-mass, brown dwarfs - stars: pre-main-sequence - stars: planetary systems - Galaxy: open clusters and associations: general - stars: general

Simbad objects: 67

goto Full paper

goto View the reference in ADS

Number of rows : 67

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 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 769 0
2 LP 944-20 LM* 03 39 35.2525168530 -35 25 43.628465433     18.69 16.39 13.288 M9.5Ve 266 0
3 IC 348 OpC 03 44 34 +32 09.8           ~ 1247 1
4 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3062 0
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2038 1
6 Cl Collinder 69 OpC 05 35 06 +09 56.0     2.8     ~ 240 0
7 * lam Ori A Em* 05 35 08.2792540686 +09 56 02.955355445 2.17 3.48 3.47     O8III((f)) 488 0
8 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 498 0
9 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1695 1
10 NGC 2168 OpC 06 08 54 +24 20.0           ~ 473 0
11 NAME Taurus Cluster Cl* 06 10.1 +09 05           ~ 65 0
12 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 326 0
13 IC 2391 OpC 08 40 32 -53 02.0           ~ 732 0
14 HD 298936 PM* 10 13 14.7723998693 -52 30 54.000802418   10.81 9.763   8.687 K3Ve 52 0
15 TWA 22 LXB 10 17 26.8983656044 -53 54 26.459439803   15.69 13.96 13.72   M5 71 0
16 V* BX Ant TT* 10 18 28.6989165716 -31 50 02.826261802   13.39 11.454 11.382 9.325 M0Ve 104 0
17 BD-09 3055 SB* 10 22 17.98945 -10 32 15.4650   12.15 11.01     K4+Vk 24 0
18 V* CE Ant TT* 10 42 30.1021269333 -33 40 16.226774953   12.21 10.91   9.10 M2Ve 157 1
19 IC 2602 OpC 10 42 58 -64 24.0           ~ 570 0
20 HD 94765 BY* 10 56 30.7993244117 +07 23 18.508791002 8.944 8.252 7.379 6.815 6.442 K0V 89 0
21 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1597 1
22 NAME TW Hya Association As* 11 01.9 -34 42           ~ 840 0
23 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1011 1
24 CD-29 8887 TT* 11 09 13.8074415397 -30 01 40.070212113   12.95 11.119 10.642 8.875 M2Ve 113 0
25 TWA 3B TT* 11 10 27.8410112470 -37 31 52.748874445   14.59 13.70   8.86 M4Ve 50 0
26 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 201 0
27 TWA 3A TT* 11 10 27.9117558304 -37 31 51.529219753   14.04 12.57   9.10 M4Ve 193 0
28 V* V1215 Cen TT* 11 13 26.2208332352 -45 23 42.719174706     12.478   10.483 K8IVe 71 0
29 V* V1217 Cen BY* 11 21 05.4812165874 -38 45 16.521880972   14.04 12.58 12.34 10.515 M1Ve 65 0
30 CD-34 7390A TT* 11 21 17.2193442623 -34 46 45.500772910   12.88 11.46 11.43 9.57 M1Ve 86 0
31 CD-34 7390 ** 11 21 17.24 -34 46 45.5     11.080   9.038 M1Ve+M1Ve 56 0
32 CD-34 7390B TT* 11 21 17.4429759333 -34 46 49.774537089   13.43 11.96 11.31 9.88 M1Ve 60 0
33 LP 732-94 LM* 11 21 49.1720839605 -13 13 08.728765179     19.57     M8.5V 124 0
34 HD 98800B SB* 11 22 05.288454 -24 46 39.04974   11.18 9.92     ~ 113 1
35 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 335 0
36 CD-33 7795B LM* 11 31 55.2500 -34 36 25.200     20.40   15.8 M8.5/9e 119 0
37 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 178 0
38 CD-26 8623B TT* 11 32 41.1729967174 -26 52 09.110626414   16.70 15.22 13.68 11.76 M5.5 68 0
39 CD-26 8623 TT* 11 32 41.2659398509 -26 51 55.961617611   13.69 12.23 11.14 9.637 M3Ve 89 0
40 TWA 26 LM* 11 39 51.1435262748 -31 59 21.473337261         15.83 M8e 99 0
41 TWA 19B Em* 11 47 20.5878427409 -49 53 04.418207096   13.82 12.30   10.21 K7e 25 0
42 HD 102458 Y*O 11 47 24.5436617458 -49 53 03.018055867   9.70 9.07   8.40 G4V 81 0
43 CD-36 7429B TT* 11 48 23.7347470027 -37 28 48.519698919   15.43 14.00   11.45 M1V 68 0
44 CD-36 7429A TT* 11 48 24.2226856081 -37 28 49.112368947   12.54 11.17 10.92 9.552 K5V 110 0
45 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 93 0
46 TWA 23 TT* 12 07 27.3753633293 -32 47 00.253618251   14.157 12.7     M2.5Ve 58 0
47 TWA 27 LM* 12 07 33.4676156527 -39 32 54.016042897     19.95 17.99 15.88 M8IVe 314 0
48 CD-58 4411 Y*O 12 09 41.8588357192 -58 54 45.059820367   11.29 10.33 10.12   K1Ve 32 0
49 V* V1249 Cen TT* 12 15 30.7203284919 -39 48 42.605543199   13.09 11.160 10.919 9.50 M0.5 89 0
50 V* V1250 Cen TT* 12 34 20.4718890806 -48 15 19.545698484   13.3 12.2   11.80 M3 36 0
51 V* V1251 Cen TT* 12 34 20.6481566532 -48 15 13.530604360   13.3 12.2   11.90 M3.5 41 0
52 1RXS J123420.1-481514 ** 12 34 20.65 -48 15 13.6           ~ 13 0
53 TWA 16 ** 12 34 56.302608 -45 38 07.63332   14.05 12.58 12.21 10.310 M2.5 52 0
54 V* V1252 Cen TT* 12 35 04.2562814902 -41 36 38.620524379   14.39 13.045   10.506 M2Ve 70 0
55 HD 109573B Y*? 12 36 00.5493890939 -39 52 15.696207303         10.78 M2.5 75 0
56 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 564 1
57 V* RT Vir AB* 13 02 37.9836301550 +05 11 08.360733054 10.07 9.07 7.41     M8III 301 0
58 2MASS J13153094-2649513 BD* 13 15 30.8602676392 -26 49 51.844923573           L5e 39 1
59 V* V1267 Cen TT* 13 20 45.3877589173 -46 11 37.712461035   14.0 12.7   10.78 K5IVe 38 0
60 RX J132047.9-461149 X 13 20 48.0 -46 11 49           ~ 4 1
61 V* V1268 Cen TT* 13 21 37.2196798397 -44 21 51.945677621     12.952   10.965 M0.5 40 0
62 V* CP Vir LP* 13 56 59.5288072130 +06 34 28.808443176   10.05 8.72     M7 16 0
63 G 200-14 PM* 14 00 26.5759826059 +47 39 58.737700385   16.3   14.4   M7V 15 0
64 V* RS Vir Mi* 14 27 16.3931666073 +04 40 41.085779853   10.27 7.00     M8 201 0
65 NAME Upper Sco Association As* 16 12 -23.4           ~ 1086 1
66 2MASS J19013357-3700304 Y*O 19 01 33.5769494372 -37 00 30.475478822           M6.5 44 0
67 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1135 3

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2006A&A...459..511B and select 'bookmark this link' or equivalent in the popup menu


2021.03.03-10:24:49

© Université de Strasbourg/CNRS

    • Contact