2008A&A...484L..21M


Query : 2008A&A...484L..21M

2008A&A...484L..21M - Astronomy and Astrophysics, volume 484, L21-25 (2008/6-4)

Chemical similarities between Galactic bulge and local thick disk red giant stars.

MELENDEZ J., ASPLUND M., ALVES-BRITO A., CUNHA K., BARBUY B., BESSELL M.S., CHIAPPINI C., FREEMAN K.C., RAMIREZ I., SMITH V.V. and YONG D.

Abstract (from CDS):

The evolution of the Milky Way bulge and its relationship with the other Galactic populations is still poorly understood. The bulge has been suggested to be either a merger-driven classical bulge or the product of a dynamical instability of the inner disk. To probe the star formation history, the initial mass function and stellar nucleosynthesis of the bulge, we performed an elemental abundance analysis of bulge red giant stars. We also completed an identical study of local thin disk, thick disk and halo giants to establish the chemical differences and similarities between the various populations. High-resolution infrared spectra of 19 bulge giants and 49 comparison giants in the solar neighborhood were acquired with Gemini/Phoenix. All stars have similar stellar parameters but cover a broad range in metallicity. A standard 1D local thermodynamic equilibrium analysis yielded the abundances of C, N, O and Fe. A homogeneous and differential analysis of the bulge, halo, thin disk and thick disk stars ensured that systematic errors were minimized. We confirm the well-established differences for [O/Fe] (at a given metallicity) between the local thin and thick disks. For the elements investigated, we find no chemical distinction between the bulge and the local thick disk, which is in contrast to previous studies relying on literature values for disk dwarf stars in the solar neighborhood. Our findings suggest that the bulge and local thick disk experienced similar, but not necessarily shared, chemical evolution histories. We argue that their formation timescales, star formation rates and initial mass functions were similar.

Abstract Copyright:

Journal keyword(s): stars: abundances - Galaxy: abundances - Galaxy: bulge - Galaxy: disk - Galaxy: evolution

Simbad objects: 70

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Number of rows : 70
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 HD 787 PM* 00 12 09.9845643792 -17 56 17.702925108   6.740 5.265     K4III 91 0
2 * 21 Cet PM* 00 54 17.5927919832 -08 44 26.390035212   7.086 6.161     G8III 76 0
3 * lam Tuc RG* 00 55 00.3110878776 -69 31 37.504702308   6.537 5.454     K2III 51 0
4 HD 8724 RG* 01 26 17.5946147784 +17 07 35.123889432   9.29 8.34     G5 113 0
5 * alf Cet LP? 03 02 16.77307 +04 05 23.0596 6.10 4.17 2.53 1.18 0.02 M1.5IIIa 451 0
6 * rho For RG* 03 47 56.0403321960 -30 10 04.378048212   6.52 5.54     G6III 63 0
7 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1229 1
8 * l Eri ** 04 38 10.8240964091 -14 18 14.483465432 5.99 4.96 3.87 3.03 2.47 K2-IIIb 131 0
9 * zet Cae PM* 04 47 49.5770927616 -30 01 13.339845156   7.432 6.346     K0III 24 0
10 * eta Men PM* 04 55 11.2020620016 -74 56 12.671416896   6.965 5.449     K4III 37 0
11 * gam Men PM* 05 31 52.8525856360 -76 20 27.246061076 7.52 6.33 5.20 4.34 3.78 K2III 95 0
12 * 36 Dor PM* 05 54 06.0545851778 -63 05 23.209034464   5.70 4.66     K2III-IV 101 0
13 HD 41667 PM* 06 05 03.6441903504 -32 59 38.727053880   9.49 8.52     G8V 43 0
14 * tet CMa PM* 06 54 11.3988612864 -12 02 19.061163780 7.20 5.51 4.08 2.95 2.17 K3/4III 213 0
15 HD 77236 PM* 09 01 14.7953520192 -02 33 41.695966296   8.65 7.51     K0III 54 0
16 HD 77729 * 09 05 04.7196525192 +26 09 53.126208612   9.06 7.62 11.4   K4III 33 0
17 HD 78050 PM* 09 06 42.9261613392 +20 30 35.503123860   9.104   7.2   G0 69 0
18 HD 80811 RG* 09 22 12.9588194952 +12 32 56.764184136   9.22   7.8   K0 39 0
19 HD 83212 Pe* 09 36 19.9521173088 -20 53 14.747509716   9.582 9.177 7.83   G6/K0IIIwF7 126 0
20 * tau Leo * 11 27 56.2395231024 +02 51 22.554108900   5.940 4.943     G8-IIIa 127 0
21 HD 99978 Pe* 11 29 37.2863122848 -55 53 44.706004728   9.56 8.61     G5/8(III) 30 0
22 * ups Leo * 11 36 56.9308590 -00 49 25.496304 6.05 5.31 4.30 3.58 3.06 G9IIIbFe-0.5 126 0
23 * c Vir RG* 12 20 20.9813922197 +03 18 45.255217001 7.27 6.12 4.96 4.07 3.46 K0.5IIIbFe-0.5 353 0
24 HD 107773 PM* 12 23 13.8898713539 -67 37 53.572986625   7.25 6.39     G8/K0IV 46 0
25 HD 114095 PM* 13 08 25.7887947456 -07 18 30.455011872   9.611 9.008     G8V 64 0
26 HD 115478 * 13 17 15.6279440976 +13 40 32.706746400 8.130 6.630 5.330     K3III 68 0
27 * 69 Vir PM* 13 27 27.1640367264 -15 58 24.885623784   5.850 4.750     K0III-IIIbCN1.5CH0.5 115 0
28 * h Vir PM* 13 32 58.0715920586 -10 09 53.995068424   6.19 5.21     G8III 78 0
29 HD 119971 PM* 13 47 38.5389693936 -50 19 14.478304008   6.791 5.446     K2III 38 0
30 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2257 0
31 HD 128188 Pe* 14 35 46.8216516864 -11 24 12.262056912   10.9 9.94     G8(w) 36 0
32 * 11 Lib PM* 14 51 01.0720205236 -02 17 56.941059804 6.64 5.92 4.94     K0III/IV 125 0
33 * 18 Lib PM* 14 58 53.5813630608 -11 08 38.462393832   7.146 5.857     K3-IIICN2 117 0
34 HD 136014 PM* 15 19 31.7208685704 -37 05 49.778326068   7.142 6.178     G8III/IV 29 0
35 HD 142948 * 16 00 02.4133504248 -53 51 05.401576152   8.96 8.03     G5III/IV 46 0
36 HD 145148 PM* 16 09 11.2150771435 +06 22 43.289900623   6.97   5.3   K1.5IV 169 0
37 Cl* NGC 6522 ARP 4167 * 18 03 22.5158244264 -29 59 25.114686324   18.52 16.883   14.982 ~ 22 0
38 ISOGAL-P J180323.6-300159 AB* 18 03 23.5582252344 -30 01 59.005714548     13.804   11.744 ~ 37 0
39 [B86] 52 RG* 18 03 28.2446747112 -30 04 10.994438208     16.027   14.015 M1 27 0
40 Cl* NGC 6522 ARP 4072 * 18 03 28.3935538320 -29 59 58.008117552     16.308   14.376 ~ 17 0
41 Cl* NGC 6522 ARP 4329 RG* 18 03 28.4320629024 -29 58 41.691364068     15.110 14.58 13.282 ~ 33 0
42 Cl* NGC 6522 ARP 4325 * 18 03 28.9774092288 -29 58 46.316345052   18.31 16.718   14.989 ~ 10 0
43 NAME Baade Window reg 18 03.5 -30 01           ~ 587 3
44 Cl* NGC 6522 ARP 4003 Pe* 18 03 33.3595221792 -29 58 12.327129660   16.70 15.087   13.380 ~ 20 0
45 [B86] 91 RG* 18 03 35.7607045248 -29 58 35.431936716     15.725   13.929 M1 27 0
46 Cl* NGC 6522 ARP 1025 * 18 03 35.8048533528 -29 59 03.484076208   18.52 16.763   14.824 ~ 15 0
47 OGLE BLG-LPV-194566 Pe* 18 03 38.1857173440 -30 00 51.626329452     14.303   12.481 ~ 19 0
48 Cl* NGC 6522 ARP 1141 * 18 03 41.8871009352 -30 00 04.277316852   17.40 15.876   14.025 ~ 19 0
49 Cl* NGC 6522 ARP 1151 RG* 18 03 43.1986660896 -29 59 40.530495480   17.28 15.914   14.247 ~ 21 0
50 Cl* NGC 6522 ARP 1156 * 18 03 44.2812104616 -29 59 34.339987176   17.47 16.08   14.187 ~ 12 0
51 Cl* NGC 6522 ARP 1158 * 18 03 44.4373653960 -29 59 38.366620044     16.463   14.742 ~ 8 0
52 Cl* NGC 6522 ARP 1194 * 18 03 48.5741615496 -29 59 31.140079800     16.114   14.182 ~ 17 0
53 Cl* NGC 6522 ARP 1322 RG* 18 03 49.3866105024 -30 01 54.191622504   16.46 14.467   12.532 ~ 33 0
54 Cl* NGC 6522 ARP 1202 * 18 03 49.8867576624 -30 00 08.464056516     15.804 15.25 13.963 ~ 17 0
55 [B86] 174 RG* 18 03 53.4252281808 -30 02 08.605163508     15.477 14.93 13.610 M2 13 0
56 V* V4307 Sgr RR* 18 10 30.7020624902 -31 23 11.399014584     16.546   15.595 ~ 7 0
57 HD 171496 * 18 36 07.4934525456 -24 26 11.309788572   9.59 8.52     G8IV 71 1
58 HD 172223 PM* 18 41 30.6798758424 -48 05 40.881324912   7.685 6.454     K2III/IVCNII 18 0
59 HD 175219 * 18 56 16.9512500808 -42 42 38.423132748   6.341 5.346     K0III 26 0
60 HD 180928 PM* 19 19 00.0959552544 -15 32 11.647331124 9.06 7.49 6.06 4.94 4.11 K4III 93 0
61 HD 186378 * 19 42 59.1388629408 +27 24 30.608805996   8.38 7.20     K2II-III 16 0
62 HD 187195 * 19 49 02.2041274104 -10 52 14.779577568 8.64 7.28 6.04     K2III 39 0
63 * 34 Vul PM* 21 21 04.3938814104 +23 51 21.486740544   6.62   4.9   K1III 116 0
64 HD 206642 PM* 21 44 29.4723514080 -38 33 09.101246328   7.418 6.283     K1IIICNIV/V 40 0
65 HD 210295 Pe* 22 09 41.4458512176 -13 36 19.475979192   10.49 10.10     Gwl 86 0
66 HD 211075 * 22 14 20.0388786240 +18 01 13.371827736   9.43 8.21     K2 31 0
67 * kap Aqr PM* 22 37 45.3804916 -04 13 40.993883   6.174 5.030     K1.5IIIbCN0.5 80 0
68 * gam Psc PM* 23 17 09.9374911 +03 16 56.237975 5.20 4.62 3.70 2.98 2.47 G9III:Fe-2 260 0
69 HD 221148 PM* 23 29 32.0817754272 -04 31 57.892874556   7.34 6.25     K3-IIIbFe2 134 0
70 NAME Galactic Bulge reg ~ ~           ~ 4018 0

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2023.02.08-02:35:18

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