2013ApJ...771...67I


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET18:36:14

2013ApJ...771...67I - Astrophys. J., 771, 67 (2013/July-1)

Chemical abundances of the Milky Way thick disk and stellar halo. II. Sodium, iron-peak, and neutron-capture elements.

ISHIGAKI M.N., AOKI W. and CHIBA M.

Abstract (from CDS):

We present chemical abundance analyses of sodium, iron-peak, and neutron-capture elements for 97 kinematically selected thick disk, inner halo, and outer halo stars with metallicities -3.3 < [Fe/H] ←0.5. The main aim of this study is to examine chemical similarities and differences among metal-poor stars belonging to these old Galactic components as a clue to determine their early chemodynamical evolution. In our previous paper, we obtained abundances of α elements by performing a one-dimensional LTE abundance analysis based on the high-resolution (R ∼ 50, 000) spectra obtained with the Subaru/HDS. In this paper, a similar analysis is performed to determine abundances of an additional 17 elements. We show that, in metallicities below [Fe/H] ~-2, the abundance ratios of many elements in the thick disk, inner halo, and outer halo subsamples are largely similar. In contrast, in higher metallicities ([Fe/H] ≳ -1.5), differences in some of the abundance ratios among the three subsamples are identified. Specifically, the [Na/Fe], [Ni/Fe], [Cu/Fe], and [Zn/Fe] ratios in the inner and outer halo subsamples are found to be lower than those in the thick disk subsample. A modest abundance difference between the two halo subsamples in this metallicity range is also seen for the [Na/Fe] and [Zn/Fe] ratios. In contrast to that observed for [Mg/Fe] in our previous paper, [Eu/Fe] ratios are more enhanced in the two halo subsamples rather than in the thick disk subsample. The observed distinct chemical abundances of some elements between the thick disk and inner/outer halo subsamples with [Fe/H] >-1.5 support the hypothesis that these components formed through different mechanisms. In particular, our results favor the scenario that the inner and outer halo components formed through an assembly of multiple progenitor systems that experienced various degrees of chemical enrichments, while the thick disk formed through rapid star formation with an efficient mixing of chemical elements. The lower [Na/Fe] and [Zn/Fe] observed in stars with the outer halo kinematics may further suggest that progenitors with longer star formation timescales contributed to the buildup of the relatively metal-rich part of stellar halos.

Abstract Copyright:

Journal keyword(s): Galaxy: formation - Galaxy: halo - stars: abundances

VizieR on-line data: <Available at CDS (J/ApJ/771/67): table1.dat table2.dat>

Simbad objects: 103

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Number of rows : 103

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 HD 5426 PM* 00 55 41.0498744897 -33 45 11.454171247   10.32 9.65 9.43 8.76 G(wp) 55 0
2 BD-18 271 Pe* 01 37 18.8811363974 -17 29 03.906643856   10.93 9.77     KIIvw 59 0
3 BD-17 484 PM* 02 31 25.7658698295 -16 59 05.047040170   10.890 10.470 10.159 9.871 F0Vwl 66 0
4 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1519 1
5 BD-10 548 PM* 02 46 55.7674219947 -10 07 35.112831577   11.162 10.411     Gwl: 46 0
6 HD 33771 PM* 05 10 49.6205885556 -37 49 03.116571464   10.19 9.41     G6/8w(F) 38 0
7 LP 894-3 PM* 05 57 50.6938997370 -30 53 48.616402363   11.65 11.34     ~ 12 0
8 BD+00 2058A PM* 07 43 43.9667229236 -00 04 00.972592389   10.653 10.202 9.888 9.578 sdF 65 0
9 BD+00 2058B PM* 07 43 44.0837428438 -00 03 49.306710634   11.741 11.253 10.909 10.593 ~ 43 0
10 G 115-58 PM* 09 10 48.1006823943 +46 22 36.754458616   12.54   11.3   sdF5 38 0
11 BD+09 2190 PM* 09 29 15.5616421382 +08 38 00.469417390   11.54   10.8   sdA5 121 0
12 Ross 889 Pe* 09 40 43.2053386236 +01 00 29.514872822       10.39   sdA4 156 0
13 HD 84937 PM* 09 48 56.09801 +13 44 39.3237 8.49 8.68 8.32 7.97 7.70 F8Vm-5 734 0
14 HD 237846 Pe* 09 52 38.6831536740 +57 54 58.617728496   10.60 9.95     CEMP-no 86 0
15 HD 85773 Pe* 09 53 39.2425768656 -22 50 08.422584118   10.51 9.43     Gwl: 88 0
16 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 732 0
17 Ross 892 PM* 10 27 24.2462412761 +01 24 00.192254880   11.55   10.8   sdF8 60 0
18 BD+04 2466 PM* 11 26 49.1890409114 +03 51 51.646284678   11.22 10.67 10.45   KIIvw 69 0
19 BD+51 1696 PM* 11 46 35.1557706721 +50 52 54.682692534 10.32 10.47   9.5   sdG0 135 0
20 HD 103295 PM* 11 53 37.0223422254 -28 38 13.021084052   10.34 9.56     G5/6III 43 0
21 HD 233891 * 11 59 59.0580706990 +51 46 17.599834243   9.63 8.82     G5III: 71 0
22 HD 105004 PM* 12 05 24.8526214531 -26 35 43.746369085   10.96 10.39     F9 96 0
23 BD+22 2442 ** 12 08 54.6643032916 +21 47 19.446132546       9.0   G2V 57 1
24 HD 105546 HB* 12 09 02.7215214809 +59 01 05.137542058   9.27 8.61 8.29   G2III: 107 0
25 HD 106373 HB* 12 14 13.2934415045 -28 15 06.557306738   9.33 8.90     A(5)w 39 0
26 HD 107752 PM* 12 22 52.7183847277 +11 36 25.486889473   10.79 10.07     KIIvw 63 0
27 HD 108317 Pe* 12 26 36.8316698542 +05 18 09.021203658       7.7   G2IVm-5 150 0
28 HD 108577 PM* 12 28 16.8615508146 +12 20 41.090259163   10.18 9.55 9.8   KIIvw 68 0
29 BD+04 2621 * 12 28 44.6433259665 +04 01 26.631105289   10.86 9.90     KIIvw 55 0
30 BD+28 2137 SB* 12 36 39.4522164624 +27 28 28.157818095   11.29   10.4   sdF2 87 0
31 BD+13 2567 ** 12 39 59.3743409679 +12 38 32.073430514   10.46   9.4   G5 55 0
32 HD 111721 PM* 12 51 25.1948813622 -13 29 28.166794065   8.78 7.97     G6V 149 0
33 HD 111980 SB* 12 53 15.0528185218 -18 31 20.009066873 8.80 8.91 8.38     F7V 158 0
34 HD 112126 * 12 53 49.1810548378 +32 30 27.720894446   10.10 8.74     K3Ib-II 20 0
35 BD+10 2495 Pe* 12 59 19.9306193436 +09 14 35.638418393   10.44 9.73     G0 68 0
36 BD+29 2356 Pe* 13 01 52.4292964485 +29 11 17.935248118   12.27 11.50     ~ 19 0
37 BD+12 2547 PM* 13 04 06.5914433026 +11 26 15.830770957   10.88 9.88     ~ 36 0
38 BD-03 3414 PM* 13 08 48.5120758198 -03 58 24.886645673   12.07 11.24     ~ 27 0
39 G 14-39 PM* 13 14 26.8899272365 -04 05 43.474243462   13.713 12.807 12.263 11.738 K3 39 0
40 G 238-30 PM* 13 17 40.1966956714 +64 15 12.171600853   13.91   12.4   sdA8 47 1
41 HD 116064 Pe* 13 21 43.7823913103 -39 18 39.998476883   9.26 8.81     F9IV-Vm-5 125 0
42 BD+13 2698 ** 13 39 59.57275 +12 35 21.6837   9.94   9.0   F9V 79 0
43 Wolf 1492 Pe* 13 40 02.4921790616 -00 02 18.750321114 11.601 11.832 11.451 11.184 10.892 sdF0: 264 0
44 HD 119516 HB* 13 43 26.7252675198 +15 34 31.070293046   9.59 9.12     G5 66 0
45 BD+34 2476 PM* 13 59 09.4838035693 +33 51 39.380333439 10.25 10.44   9.7   sdF5 153 0
46 HD 122196 PM* 14 01 02.1244272306 -38 03 03.297565043   9.19 8.75     F0(V)w 110 0
47 Ross 841 Pe* 14 02 30.0901582051 -05 39 05.181328144   11.508 11.149 10.866 10.576 sdA3 142 0
48 HD 122956 PM* 14 05 13.0245301143 -14 51 25.455585497   8.18 7.25 6.88   G6IV/VwF6 145 0
49 HD 124358 PM* 14 13 21.3208360324 -12 09 24.184736022   10.38 9.54     Gwl 44 0
50 BD+09 2870 PM* 14 16 29.9462486775 +08 27 52.953658087   10.58 9.70     KIIvw 64 0
51 Ross 50 PM* 14 34 51.1108673462 +25 10 03.233569951   13.38   12.1   ~ 45 0
52 HD 128279 Pe* 14 36 48.5106582134 -29 06 46.610625293 8.64 8.63 8.00     Gw 178 0
53 G 66-51 PM* 15 00 50.0691059415 +02 07 37.456014679   11.34   10.1   K0 32 0
54 BD-08 3901 Pe* 15 04 51.2325565938 -08 48 56.499069774   10.34 9.44     G0 30 0
55 BD+30 2611 * 15 06 53.8283818900 +30 00 36.942401309 11.50 10.37 9.13     G8III 128 0
56 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1207 0
57 HD 134439 PM* 15 10 13.0874231858 -16 22 45.866399625 10.03 9.837 9.066 8.604 8.160 sd:K1Fe-1 304 0
58 Ross 1038 PM* 15 12 32.4357053026 +06 01 44.318596224   13.09 12.33 11.5   G5 58 0
59 LP 859-35 PM* 15 19 35.6717720151 -24 31 04.085195091   12.307 11.623     ~ 10 0
60 BD+01 3070 SB* 15 22 40.0591407424 +01 15 53.453294727   10.59 9.98     G0 36 0
61 BD+13 2995 PM* 15 44 14.0752566189 +12 56 51.741014785       10.6   ~ 9 0
62 LP 443-65 PM* 15 49 22.8355974485 +14 38 27.419623077   12.83   12.6   ~ 12 0
63 BD-06 4346 PM* 16 03 00.1730522578 -06 27 11.166778247   10.93 10.18     ~ 27 0
64 HD 149414 SB* 16 34 42.3556924921 -04 13 44.634894711 10.48 10.37 9.63     G5Ve 190 0
65 BD-08 4501 PM* 17 47 27.9713460047 -08 46 47.733691581   11.18 10.59     sdF8 114 0
66 G 154-34 PM* 17 55 58.4629571003 -16 24 32.742956604   11.98 11.29     sdF8 62 0
67 G 206-23 PM* 18 21 35.8127193368 +34 49 02.052338816   12.4   11.7   ~ 16 0
68 HD 171496 * 18 36 07.4934207098 -24 26 11.312599970   9.59 8.52     G8IV 68 1
69 HD 175305 Pe* 18 47 06.4424234462 +74 43 31.448124921 8.07 7.93 7.18 6.52 6.03 G5III 198 0
70 LP 751-19 PM* 18 51 09.0158840687 -11 48 21.557400520   11.14 10.53     ~ 8 0
71 HD 180164 PM* 19 15 08.1471587806 +10 34 31.486060521       9.0   F8 20 0
72 G 125-13 PM* 19 31 09.2289639431 +36 09 10.174838318   10.68   9.9   sdF7 64 0
73 HD 184266 HB* 19 34 15.3865221565 -16 19 00.228332880 8.27 8.12 7.57     F2V 111 0
74 G 142-44 ** 19 38 53.1688220489 +16 25 34.096304861       11.3   G5 25 0
75 BD+05 4314 PM* 19 51 49.6044701895 +05 36 45.901004947   11.46   10.8   G5 51 0
76 HD 188510 PM* 19 55 09.6783577203 +10 44 27.395091177 9.30 9.41   8.5   G5V: 238 0
77 G 24-3 PM* 20 05 44.3170613889 +04 02 52.811312960   10.92   10.2   sdF8 84 0
78 HD 193901 PM* 20 23 35.8472360557 -21 22 14.228814044 9.08 9.22 8.67 8.17 7.87 F7V 261 0
79 HD 196892 PM* 20 40 49.3803469997 -18 47 33.286582149   8.73 8.23     F6V 112 0
80 G 210-33 PM* 20 45 23.4040259897 +40 23 27.116526978       10.9   sdF5 20 0
81 BD-14 5850 PM* 20 47 34.3986984594 -14 25 33.669815521   11.39 11.00     F5V 29 0
82 BD+41 3931 PM* 20 55 16.7552935756 +42 18 00.676419326       10.0   G5 88 0
83 HD 358059 Pe* 20 56 09.1348741356 -13 31 17.689533403   11.016 10.192     G0 51 0
84 G 25-24 PM* 21 16 41.6330613692 -01 18 08.770570737   12.058 11.591 11.284 10.91 ~ 45 0
85 BD+26 4136 PM* 21 21 57.7460071188 +27 27 10.383675607       10.1   sdG0 39 0
86 BD-03 5215 * 21 28 01.3177680624 -03 07 40.920957985   10.79 10.08     Gwl: 49 0
87 BD+59 2407 PM* 21 39 16.1491127916 +60 17 01.796449735       10.0   G2 62 0
88 G 188-21 PM* 21 43 16.7515994399 +24 08 55.473906363   15.6   13.8   ~ 5 0
89 BD+26 4251 PM* 21 43 57.1238901563 +27 23 23.991146537       9.9   F6 78 0
90 Wolf 1143 PM* 21 55 16.1464999391 +32 38 41.147785186   11.69   10.6   G2V 70 0
91 Wolf 984 PM* 22 05 01.4079846222 +08 38 18.901348262   12.61   11.2   sdF8: 41 0
92 HD 210295 PM* 22 09 41.4458820463 -13 36 19.476747948   10.49 10.10     Gwl 82 0
93 HD 213487 * 22 32 03.3054763547 -21 35 56.675508006   10.720 9.858 9.38 9.02 G8IV 32 0
94 HD 213467 PM* 22 32 07.8972912361 -31 10 24.953402094   9.26 8.58     G5VwF3 57 0
95 HD 214161 PM* 22 37 08.0752432901 -40 30 38.632052127   9.83 9.13     G5/8wF(0) 27 0
96 HD 214362 HB* 22 37 58.6722082211 -22 38 40.155512459   9.56 8.80     Gwl 52 0
97 HD 215601 PM* 22 46 48.0940582903 -31 52 19.356551937   9.23 8.49     G6/8wF3 41 0
98 LP 877-23 PM* 22 52 41.0353308036 -20 35 32.995847106   13.02 11.90     ~ 105 0
99 CD-24 17504 Pe* 23 07 20.2536159873 -23 52 35.956455668   12.51 12.18     CEMP-no 83 0
100 G 275-11 PM* 23 09 58.4602378914 -20 57 23.161342670   12.248 11.758     ~ 18 0
101 HD 218857 PM* 23 11 24.5948588495 -16 15 04.029541995   9.60 8.95     G5/8w(a) 104 0
102 G 273-90 PM* 23 37 28.5097491130 -13 47 38.262789396   12.420 11.929     ~ 13 0
103 NAME Galactic Bulge reg ~ ~           ~ 3535 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-18:36:14

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