2009A&A...501..965V

Query : 2009A&A...501..965V

2009A&A...501..965V - Astronomy and Astrophysics, volume 501965-971 (2009/7-3)

Search for associations containing young stars (SACY). II. Chemical abundances of stars in 11 young associations in the solar neighborhood.

VIANA ALMEIDA P., SANTOS N.C., MELO C., AMMLER-VON EIFF M., TORRES C.A.O., QUAST G.R., GAMEIRO J.F. and STERZIK M.

Abstract (from CDS):

The recently discovered coeval, moving groups of young stellar objects in the solar neighborhood represent invaluable laboratories for studying recent star formation and searching for high metallicity stars that can be included in future exo-planet surveys. In this study, we derived through an uniform and homogeneous method stellar atmospheric parameters and abundances for iron, silicium, and nickel in 63 post-T Tauri stars from 11 nearby young associations. We further compare the results with two different pre-main sequence (PMS) and main sequence (MS) star populations. The stellar atmospheric parameters and the abundances presented here were derived using the equivalent width of individual lines in the stellar spectra by assuming the excitation/ionization equilibrium of iron. Moreover, we compared the observed Balmer lines with synthetic profiles calculated for model atmospheres with a different line-formation code. We found that the synthetic profiles agree reasonably well with the observed profiles, although the Balmer lines of many stars are substantially filled-in, probably by chromospheric emission. Solar metallicity is found to be a common trend in all the nearby young associations studied. The low abundance dispersion within each association strengthens the idea that the origin of these nearby young associations is related to the nearby star-forming regions (SFR). Abundances of elements other than iron are consistent with previous results for Main Sequence stars in the solar neighborhood. The chemical characterization of the members of the newly found nearby young associations, performed in this study and intended to proceed in subsequent works, is essential to understanding and testing the context of local star formation and the evolutionary history of the galaxy.

Abstract Copyright: ∼

Journal keyword(s): stars: pre-main sequence - stars: abundances - open clusters and associations: general - stars: fundamental parameters - solar neighborhood

Simbad objects: 78

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Number of rows : 78
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 THA MGr 00 00 -62.0           ~ 540 0
2 HD 105 PM* 00 05 52.5447817152 -41 45 11.044988352   8.13 7.53     G0V 203 0
3 HD 987 PM* 00 13 53.0108292528 -74 41 17.850099516   9.48 8.724   7.933 G8V 122 0
4 BD-12 243 PM* 01 20 32.2680172224 -11 28 03.727949952   9.19 8.39     G9V 107 1
5 HD 8558 PM* 01 23 21.2547930336 -57 28 50.688846336   9.21 8.543   7.773 G7V 102 0
6 V* CC Phe PM* 01 28 08.6607223056 -52 38 19.144933512   9.98 9.07     K1V 103 0
7 1RXS J025804.6-624115 Er* 02 58 04.0079248080 -62 41 13.551474552   12.35 11.66 11.15 10.403 K3Ve 25 0
8 CD-46 1064 PM* 03 30 49.1011356768 -45 55 57.363470616   10.67 9.622   8.494 K3V 53 0
9 HD 23208 Er* 03 42 39.8039107536 -20 32 43.627789860   9.93 9.109   8.238 G8V 52 0
10 HD 26980 Er* 04 14 22.5713382072 -38 19 01.574486904   9.76 9.069   8.397 G3V 59 0
11 HD 27679 Er* 04 21 10.3269201336 -24 32 20.975774928   10.08 9.43   8.74 G2V 35 0
12 CD-36 1785 Ro* 04 34 50.7800567112 -35 47 21.173442684   11.88 10.94   9.857 K1Ve 28 0
13 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
14 HD 32372 Er* 05 00 51.8670832680 -41 01 06.722144292   10.20 9.54     G5V 44 0
15 CD-40 1701 Ro* 05 02 30.4260906456 -39 59 13.025142636   11.47 10.56 10.22 9.493 K4V 28 0
16 HD 274561 V* 05 28 55.0976983704 -45 34 58.417870656   12.66 11.48     K1V(e) 23 0
17 CD-29 2360 Ro* 05 34 59.2269000456 -29 54 03.974248692   11.66 10.534   9.420 K3Ve 16 0
18 V* UY Pic RS* 05 36 56.8528399368 -47 57 52.883969472   8.77 7.676   6.699 K0V 147 0
19 HD 37551A Er* 05 37 12.9178798584 -42 42 55.653395796   10.40 9.674 9.79   G7V 17 0
20 HD 37551B * 05 37 13.2417786624 -42 42 57.369940416   11.53 10.60 10.48   K1V 15 0
21 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 337 0
22 CD-34 2676 Ro* 06 08 33.8671602552 -34 02 54.947408820   10.99 10.285   9.372 G9Ve 27 0
23 HD 44627 Er* 06 19 12.9130449912 -58 03 15.527294208   10.01 9.205   8.185 K1V(e) 207 1
24 CD-40 2458 Er* 06 26 06.9121433208 -41 02 53.789757864   10.82 9.99   9.151 K0V 31 0
25 HD 47875 Er* 06 34 40.9887640488 -69 53 06.152733708   9.84 9.17     G4V 41 1
26 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 540 0
27 CD-28 3434 * 06 47 37.6813029312 -28 58 08.237217360   11.45 9.99     K0V 13 0
28 ASAS J065527-6806.3 Er* 06 55 25.1950819656 -68 06 20.962532700   13.11 11.827   10.538 K4Ve 17 0
29 HD 55279 PM* 07 00 30.4893149280 -79 41 45.989345904   11.12 10.084   9.014 K2V 76 1
30 CD-42 2906 Ro* 07 01 53.4055070760 -42 27 56.158534944   11.48 10.61   9.621 K1V 22 0
31 CD-57 1709 Er* 07 21 23.7052557888 -57 20 36.987622800   11.39 10.725   9.772 K0V 33 0
32 CD-84 80 PM* 07 30 59.4424641336 -84 19 27.688377000   10.82 9.980   9.025 G9V 39 0
33 HD 64982 * 07 45 35.5417865214 -79 40 08.162098396   9.51 8.96 8.776   G0V 24 0
34 ASAS J075355-5710.1 V* 07 53 55.4797003848 -57 10 07.345097760   12.50 11.49 10.89 10.85 K0V 17 0
35 CD-38 4458 * 08 26 10.038000 -39 02 05.16732   10.985 10.332 10.167   G9V 7 0
36 CD-55 2543 Ro* 09 09 29.3537873400 -55 38 27.168923904   10.96 10.214   9.417 G8V 25 0
37 BD-20 2977 Ro* 09 39 51.4268421456 -21 34 17.444950860   10.93 10.34     G9V 18 0
38 CD-39 5833 * 09 47 19.8552144552 -40 03 09.845765064   11.57 10.89     K0V 36 0
39 HD 297769 * 10 05 57.5841043296 -50 10 51.278154276   10.58 10.40     F0 7 0
40 HD 298936 PM* 10 13 14.7724609728 -52 30 54.001503468   10.81 9.763   8.687 K3Ve 69 0
41 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
42 CPD-52 5025 Y*O 11 55 57.7071663168 -52 54 00.915635880   12.06 11.00     K4V 18 0
43 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 188 0
44 HD 105923 Or* 12 11 38.1470604024 -71 10 36.027201000   9.86 9.140   8.286 G8V 36 0
45 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
46 CPD-64 1859 Or* 12 19 21.6378016896 -64 54 10.321434324 11.48 10.87 9.90   8.907 K3V 21 0
47 RX J1230.5-5222 Or* 12 30 29.5836357576 -52 22 26.968784916   13.06 12.05   10.075 K3V(e) 24 0
48 CD-51 6900 Or* 12 40 46.6321070544 -52 11 04.629357564   13.01 11.66     K2V(e) 14 0
49 CD-40 7581 Er* 12 56 12.2594123496 -41 22 19.470692532   12.30 11.46   10.397 K2V 15 0
50 CD-40 8031 Or* 13 37 57.2943420144 -41 34 41.898243792   10.93 10.006   9.040 K0IV 42 0
51 CPD-66 2366 Or* 13 54 07.4243272896 -67 33 44.874643752   11.69 11.03     G6V 13 0
52 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
53 CD-34 10180 TT* 15 07 14.8172880480 -35 04 59.527866036 11.84 11.37 10.662 10.02 9.631 K0IVe 39 0
54 CD-36 10208 TT* 15 29 47.2648270536 -36 28 37.407579780   12.60 11.16   10.644 K2IVe 26 0
55 ASAS J153328-6651.4 PM* 15 33 27.4803708936 -66 51 24.783191316   11.79 10.905   9.761 K2V(e) 17 0
56 CD-39 10162 TT* 15 47 41.7650471808 -40 18 26.748166644 12.58 12.33 11.158 10.75 10.047 K1e 43 0
57 CD-25 11330 TT* 16 05 50.6524391928 -25 33 13.618314720   11.87 10.895   9.797 K1V(e) 38 0
58 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
59 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
60 CD-22 11502 TT* 16 19 33.9664198296 -22 28 29.466255036   12.72 11.312   10.065 K1IV 45 0
61 NAME rho Oph Complex reg 16 25 -23.5           ~ 79 1
62 CD-51 10295 PM* 16 33 50.4655483392 -51 19 01.274590452   11.68 10.629 10.546 9.388 K2V(e) 11 0
63 CD-31 13486 PM* 17 02 27.7999829208 -32 04 36.183768636   10.99 10.136   9.260 G8V 9 0
64 HD 322990 Pu* 17 16 07.6774103616 -37 28 27.342772104   12.72 11.34   10.266 K2Ve 11 0
65 CD-23 13281 Ro* 17 16 18.0824597208 -23 10 47.391610944   11.91 11.016   9.773 K3Ve 14 0
66 TYC 7886-1894-1 * 17 58 31.4793273072 -37 43 03.309849048   12.11 11.92     K2IVe 9 0
67 CD-37 12759 TT* 18 39 05.2883583096 -37 26 21.824393172   11.96 10.98     K1 26 0
68 CD-36 13163 TT* 18 57 20.8422617712 -36 43 00.643933128   11.77 11.16     G5IV 21 0
69 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 554 0
70 HD 202917 PM* 21 20 49.9576157736 -53 02 03.155667216   9.32 8.67   7.882 G7V 191 0
71 HD 207278 ** 21 48 48.5085945312 -39 29 09.510292536   10.32 9.651   8.887 G7V 35 0
72 CD-52 10232 PM* 22 39 30.2733947448 -52 05 17.274276024   11.83 11.08     K0V 17 0
73 HD 217343 PM* 23 00 19.2868499184 -26 09 13.504347252   8.12 7.48   6.75 G5V 122 0
74 HD 218860 PM* 23 11 52.0534851600 -45 08 10.631426784   9.52 8.782   7.930 G8V 85 0
75 HD 222259B PM* 23 39 39.2696512896 -69 11 39.493567176   10.62 9.84     K3Ve 49 0
76 NAME Argus Association As* ~ ~           ~ 266 0
77 NAME Octans Association As* ~ ~           ~ 101 0
78 NAME Carina Moving Group MGr ~ ~           ~ 66 0

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