2010A&A...511L..10N

Query : 2010A&A...511L..10N

2010A&A...511L..10N - Astronomy and Astrophysics, volume 511L10-10 (2010/2-2)

Two distinct halo populations in the solar neighborhood . Evidence from stellar abundance ratios and kinematics.

NISSEN P.E. and SCHUSTER W.J.

Abstract (from CDS):

Precise abundance ratios are determined for 94 dwarf stars with 5200<T_eff<6300K, -1.6<[Fe/H]←0.4, and distances D≲335pc. Most of them have halo kinematics, but 16 thick-disk stars are included. Equivalent widths of atomic lines are measured from VLT/UVES and NOT/FIES spectra with resolutions R≃55000 and R≃40000, respectively. An LTE abundance analysis based on MARCS models is applied to derive precise differential abundance ratios of Na, Mg, Si, Ca, Ti, Cr, and Ni with respect to Fe. The halo stars fall into two populations, clearly separated in [α/Fe], where α refers to the average abundance of Mg, Si, Ca, and Ti. Differences in [Na/Fe] and [Ni/Fe] are also present with a remarkably clear correlation between these two abundance ratios. The ``high-α'' stars may be ancient disk or bulge stars ``heated'' to halo kinematics by merging satellite galaxies or they could have formed as the first stars during the collapse of a proto-Galactic gas cloud. The kinematics of the ``low-α'' stars suggest that they have been accreted from dwarf galaxies, and that some of them may originate from the ω Cen progenitor galaxy.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/A+A/511/L10): stars.dat table3.dat table4.dat>

Simbad objects: 95

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Number of rows : 95
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 BD-03 56 PM* 00 29 26.6605338732 -02 20 57.055990746   11.269 10.648 10.630   ~ 43 0
2 HD 3567 PM* 00 38 31.9473242153 -08 18 33.392826667 9.54 9.70 9.23     F7/8wF3 221 0
3 BD+47 451 SB* 01 34 22.6964788822 +48 44 27.436010103       10.4   M3V 45 0
4 CD-61 282 PM* 01 36 05.8495294416 -61 05 03.492150337   10.63 10.10     G0 74 0
5 BD-01 306 PM* 02 14 40.2989460555 -01 12 05.123909214 9.60 9.631 9.066 8.712 8.377 G0 162 0
6 BD+26 377 PM* 02 16 56.5527833760 +27 24 48.417934572   11.06   9.9   G0 40 0
7 BD+32 467 PM* 02 34 13.2132669745 +33 00 05.091152673   11.13   10.2   G0 36 0
8 G 75-31 PM* 02 38 21.5033134703 +02 26 44.370557521   10.968 10.424 10.389   sd?F8 70 0
9 HD 17820 PM* 02 51 58.3551725257 +11 22 11.940361848 8.85 8.92   8.0   G5 123 0
10 G 5-19 PM* 03 11 26.5406862511 +12 37 09.570643728   11.77   11.0   ~ 54 0
11 Ross 374 PM* 03 26 59.7729638950 +23 46 35.925963580   11.36   10.6   F5 83 0
12 BD+20 571 Pe* 03 27 39.4522217875 +21 02 34.994793492   11.36   10.8   G0 67 0
13 HD 22879 Pe* 03 40 22.0652879951 -03 13 01.124265616 7.146 7.222 6.667 6.346 6.016 G0VmF2 529 0
14 HD 25704 ** 04 01 44.6317980946 -57 12 24.598726799   8.65 8.10     F7V 161 0
15 HD 276029 PM* 04 03 55.2569638894 +39 44 19.199783595   11.27   10.3   F8 43 0
16 HD 284248 Pe* 04 14 35.5161858536 +22 21 04.252516252 9.49 9.68 9.23 8.77 8.43 sdG0 200 0
17 BD-06 855 PM* 04 14 58.1068708300 -05 37 48.859008052   11.278 10.601 10.192 9.794 ~ 94 0
18 HD 283807 PM* 04 44 42.0610259088 +25 56 09.599948808   10.78   9.7   G0 61 0
19 HD 277559 PM* 05 05 28.7086497622 +40 15 26.368031686   10.08   9.4   F5 65 0
20 HD 241253 PM* 05 09 56.9589768600 +05 33 26.741302308   10.24   9.4   G0 104 0
21 HD 246067 PM* 05 39 27.4342825426 +03 57 02.683945678       9.9   G0 62 0
22 HD 250792 Pe* 06 03 14.8636143602 +19 21 38.696218609 9.89 9.898 9.310 8.954 8.547 G1 177 0
23 BD+33 1279a PM* 06 13 49.8286755927 +33 25 02.118887862   11.65   11.1   F8 40 0
24 G 192-43 PM* 06 47 44.9352596626 +58 38 34.532968179   10.75   10.1   F2 74 0
25 CD-33 3337 PM* 06 54 47.8101117384 -33 44 49.024262364   9.56 9.03     F5 103 0
26 G 103-69 PM* 06 54 56.2977228912 +35 30 58.636262340   11.55   11.1   sdF2 42 0
27 HD 51754 PM* 06 58 38.5387458343 -00 28 49.696648518 9.60 9.567 9.009 8.663 8.334 G2V 145 0
28 CD-57 1633 HV* 07 06 28.9516977109 -57 27 29.118927115   10.04 9.54     F7V 114 0
29 HD 59392 Pe* 07 28 03.2212916981 -38 00 41.278587469   10.17 9.7     F0V 102 0
30 CD-45 3283 PM* 07 34 18.5993129322 -45 16 42.883606401   11.08 10.43     G8V-VI 88 0
31 BD+00 2058A Pe* 07 43 43.9667566029 -00 04 00.973799875   10.653 10.202 9.888 9.578 sdF 91 0
32 BD+00 2058B PM* 07 43 44.0845747828 -00 03 49.307082024   11.741 11.253 10.909 10.593 ~ 60 0
33 HD 233511 PM* 08 19 22.5714563279 +54 05 09.623339988 10.02 10.24   9.4   F4 149 0
34 HD 76932 PM* 08 58 43.9327642391 -16 07 57.817644364 6.47 6.39 5.86     G2VFe-1.8CH-1 426 0
35 G 114-42 PM* 09 10 44.8904400192 -03 48 09.630888660   13.281 12.746 12.403 12.052 ~ 50 0
36 G 46-31 SB* 09 17 04.0007462520 +03 01 29.610961464   11.359 10.897 10.704   ~ 72 0
37 HD 237822 PM* 09 36 49.5206880772 +57 54 41.015334894   10.59   9.6   G3V 57 0
38 BD+29 1925 SB* 09 38 50.6066348979 +28 24 08.612287954   11.095 10.548 10.448   G5 40 0
39 BD-03 2764 PM* 09 45 37.8300847800 -04 40 28.499674008   11.333 10.849 10.499 10.175 ~ 46 0
40 HD 298986 PM* 10 17 14.8774744591 -52 29 18.694800089   10.46 10.03   9.48 F5 97 0
41 Ross 892 PM* 10 27 24.2460060626 +01 24 00.190284079   11.55   10.8   sdF8 76 0
42 CD-43 6810 PM* 11 08 40.0891980744 -44 15 33.814235556   10.38 9.82     F8 78 0
43 HD 97320 Pe* 11 11 00.7344001848 -65 25 37.745815656   9.769 9.269     F3V 158 0
44 BD+36 2165 PM* 11 12 47.9997679646 +35 43 43.885058670 9.98 10.19 9.76 9.34 9.02 G0 143 0
45 G 56-30 PM* 11 21 35.1061968969 +18 11 44.559215421   11.50   10.7   sd?G0 40 0
46 BD+20 2594 PM* 11 23 16.2307856395 +19 53 37.663112839   10.51   9.6   F9 85 0
47 BD+11 2369 PM* 11 32 34.1257455852 +10 54 11.307005592   10.73   9.7   G0 43 0
48 BD+26 2251 PM* 11 44 35.7049511770 +25 32 11.689104807   10.82   9.9   F6 102 0
49 BD+51 1696 Pe* 11 46 35.1556060454 +50 52 54.680145444 10.32 10.47   9.5   sdG0 172 0
50 BD-21 3420 PM* 11 55 28.4581009368 -22 23 13.324840296   10.649 10.107     F5 74 0
51 HD 103723 PM* 11 56 36.0251513496 -21 25 09.829610868   10.554 10.091     F5/6V 87 0
52 HD 105004 PM* 12 05 24.8526164337 -26 35 43.750181317   10.96 10.39     F9 117 0
53 HD 106516 SB* 12 15 10.55731 -10 18 44.6354 6.44 6.57 6.11     F9VFe-1.7CH-0.7 443 0
54 BD+02 2541 PM* 12 26 59.8614892629 +01 33 58.401336422   11.23   9.9   G3 61 0
55 HD 111980 SB* 12 53 15.0529661499 -18 31 20.013189741 8.80 8.91 8.38     F7V 185 0
56 HD 113679 PM* 13 05 52.8245053407 -38 30 59.990193435   10.342 9.797     G2/3V 114 0
57 HD 114762 SB* 13 12 19.7410686234 +17 31 01.630334317 7.78         F9VgF8mF4+M6?V 570 1
58 G 63-26 Pe* 13 24 30.5997776592 +20 27 22.094791164   12.62 12.18 12.5   sd:F 70 0
59 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
60 G 150-40 PM* 13 48 52.1482901497 +27 40 09.478619610       10.5   sdF9 45 0
61 HD 120559 SB* 13 51 40.3987847839 -57 26 08.350982731 8.679 8.647 7.982 7.605 7.217 G7VFe-1.4CH-1 168 0
62 HD 121004 PM* 13 53 58.1163626566 -46 32 19.522719077   10.112 9.522     G2V 164 0
63 HD 126681 PM* 14 27 24.9094012952 -18 24 40.454425566   9.939 9.535     G3V 208 0
64 BD+06 2932 PM* 14 43 17.9691516998 +05 49 39.761109950   11.33 10.51     G6V 120 0
65 HD 132475 PM* 14 59 49.7651173448 -22 00 45.815162806 8.98 9.11 8.55     F5/6V 256 1
66 G 15-23 SB* 15 29 31.6798974496 +06 08 49.881802340   11.67   10.6   ~ 59 0
67 Wolf 615 Pe* 15 58 18.6154199664 +02 03 06.102568584   11.41   10.3   ~ 39 0
68 BD+42 2667 Pe* 16 03 13.2988107325 +42 14 46.651500150   10.33   9.6   F5 159 0
69 HD 148816 PM* 16 30 28.4586254384 +04 10 41.602836534 7.75 7.81 7.28 6.82 6.49 F7V 329 0
70 HD 159482 PM* 17 34 43.0816088882 +06 00 51.815208744   8.94 8.36     G0V 171 0
71 BD+18 3423 PM* 17 38 15.6094693200 +18 33 25.483804164 10.17 10.27   9.4   F6V 136 0
72 HD 160693 PM* 17 39 36.8721883235 +37 11 01.504256846 8.94 8.92   8.0   G0 224 0
73 BD-08 4501 PM* 17 47 27.9712915686 -08 46 47.733112329   11.18 10.59     sdF8 140 0
74 HD 163810 ** 17 58 38.4538029750 -13 05 49.654844460 10.15 10.23 9.63     G3V 158 0
75 G 21-22 PM* 18 39 09.7158608590 +00 07 14.320687061   11.285 10.775 10.437 10.086 G4 71 0
76 HD 175179 PM* 18 54 23.2029803432 -04 36 18.621907480 9.56 9.61 9.03     G5V 135 0
77 HD 230409 PM* 19 00 43.3339876251 +19 04 28.418294811   10.78   9.6   G0 97 0
78 HD 177095 PM* 19 03 56.7108988306 -20 27 36.566397661   10.27 9.64     G6V 56 0
79 HD 179626 PM* 19 13 20.7189797919 -00 35 42.325251766   9.701 9.187 8.844 8.489 F5V 136 0
80 G 125-13 PM* 19 31 09.2290684806 +36 09 10.176410214   10.68   9.9   sdF7 71 0
81 HD 189558 PM* 20 01 00.2452184673 -12 15 20.353638621   8.28 7.73     F8/G2V 202 0
82 BD+05 4481 PM* 20 20 24.5608644037 +06 01 52.826286539   10.75   10.8   G4 72 0
83 HD 193901 PM* 20 23 35.8471605389 -21 22 14.226959304 9.08 9.22 8.67 8.17 7.87 F7V 298 0
84 HD 194598 PM* 20 26 11.9183775668 +09 27 00.429558608 8.62 8.82 8.34 7.90 7.56 F8 315 0
85 G 24-25 SB* 20 40 16.1053839864 +00 33 19.651652964       10.2   CEMP-s 57 0
86 HD 199289 PM* 20 58 08.5239126371 -48 12 13.459812756   8.82 8.30     F5V 134 0
87 HD 335471 PM* 21 03 06.1287954464 +29 28 56.213243727       9.7   G5 50 0
88 G 232-18 PM* 21 30 37.2926670600 +48 51 59.666714316       10.2   sd?G2 35 0
89 HD 205650 PM* 21 37 26.0286639804 -27 38 06.697265704   9.59 9.00     F6V 112 0
90 BD+26 4251 PM* 21 43 57.1238515464 +27 23 23.989925868       9.9   F6 100 0
91 BD+11 4725 SB* 22 05 40.6982164308 +12 22 36.113158501   10.22 9.58 9.502   G3 104 0
92 BD+07 4841 PM* 22 18 36.5059714907 +08 26 44.962089682   10.84   10.1   G0 127 0
93 G 127-26 PM* 22 23 49.0859208600 +24 23 33.136159236       10.2   F9 45 0
94 HD 219617 ** 23 17 05.04375 -13 51 03.5971 8.41 8.60 8.14 7.70 7.37 F8 317 0
95 HD 222766 PM* 23 43 34.9167361914 -07 55 24.014028099   10.769 10.115 9.728 9.349 G5/6V 91 0

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