2016A&A...585A.102Y


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.19CET19:42:56

2016A&A...585A.102Y - Astronomy and Astrophysics, volume 585A, 102-102 (2016/1-1)

Non-LTE analysis of copper abundances for the two distinct halo populations in the solar neighborhood.

YAN H.L., SHI J.R., NISSEN P.E. and ZHAO G.

Abstract (from CDS):

Two distinct halo populations were found in the solar neighborhood by a series of works. They can be clearly separated by [α/Fe] and several other elemental abundance ratios including [Cu/Fe]. Very recently, a non-local thermodynamic equilibrium (non-LTE) study revealed that relatively large departures exist between LTE and non-LTE results in copper abundance analysis. The study also showed that non-LTE effects of neutral copper vary with stellar parameters and thus affect the [Cu/Fe] trend. We aim to derive the copper abundances for the stars from the sample of Nissen & Schuster (2010A&A...511L..10N) with both LTE and non-LTE calculations. Based on our results, we study the non-LTE effects of copper and investigate whether the high-α population can still be distinguished from the low-α population in the non-LTE [Cu/Fe] results. Our differential abundance ratios are derived from the high-resolution spectra collected from VLT/UVES and NOT/FIES spectrographs. Applying the MAFAGS opacity sampling atmospheric models and spectrum synthesis method, we derive the non-LTE copper abundances based on the new atomic model with current atomic data obtained from both laboratory and theoretical calculations. The copper abundances determined from non-LTE calculations are increased by 0.01 to 0.2dex depending on the stellar parameters compared with the LTE results. The non-LTE [Cu/Fe] trend is much flatter than the LTE one in the metallicity range -1.6<[Fe/H]←0.8. Taking non-LTE effects into consideration, the high- and low-α stars still show distinguishable copper abundances, which appear even more clear in a diagram of non-LTE [Cu/Fe] versus [Fe/H]. The non-LTE effects are strong for copper, especially in metal-poor stars. Our results confirmed that there are two distinct halo populations in the solar neighborhood. The dichotomy in copper abundance is a peculiar feature of each population, suggesting that they formed in different environments and evolved obeying diverse scenarios.

Abstract Copyright:

Journal keyword(s): Galaxy: evolution - Galaxy: halo - line: formation - line: profiles - stars: abundances - stars: atmospheres

VizieR on-line data: <Available at CDS (J/A+A/585/A102): tablea1.dat tablea2.dat>

Simbad objects: 79

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Number of rows : 79

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 BD-03 56 PM* 00 29 26.6605713795 -02 20 57.056817663   11.15 10.60     ~ 30 0
2 HD 3567 PM* 00 38 31.9476246205 -08 18 33.395481958 9.54 9.70 9.23     F7/8wF3 189 0
3 BD+47 451 SB* 01 34 22.6996880648 +48 44 27.498999259       10.4   K0 31 0
4 CD-61 282 PM* 01 36 05.8498088859 -61 05 03.493817197   10.63 10.10     G0 56 0
5 BD-01 306 PM* 02 14 40.2992022335 -01 12 05.123755516 9.60 9.631 9.066 8.712 8.377 G0 130 0
6 BD+26 377 PM* 02 16 56.5526146034 +27 24 48.420491528   11.06   9.9   G0 30 0
7 BD+32 467 PM* 02 34 13.2136258632 +33 00 05.089621676   11.13   10.2   G0 26 0
8 G 75-31 PM* 02 38 21.5034600130 +02 26 44.370026467   10.99   10.2   sd?F8 56 0
9 HD 17820 PM* 02 51 58.3549892835 +11 22 11.936962577 8.85 8.92   8.0   G5 96 0
10 G 5-19 PM* 03 11 26.5408307448 +12 37 09.570143650   11.77   11.0   ~ 39 0
11 BD+20 571 PM* 03 27 39.4524583375 +21 02 34.997258945   11.36   10.8   G0 51 0
12 HD 22879 Pe* 03 40 22.0654223510 -03 13 01.124769689 7.146 7.222 6.667 6.346 6.016 G0VmF2 426 0
13 HD 25704 ** 04 01 44.6318109883 -57 12 24.595289561   8.65 8.10     F7V 132 0
14 HD 276029 PM* 04 03 55.2567472345 +39 44 19.200463256   11.27   10.3   F8 28 0
15 BD-06 855 PM* 04 14 58.1069690964 -05 37 48.859109554   11.278 10.601 10.192 9.794 ~ 68 0
16 HD 283807 PM* 04 44 42.0611402030 +25 56 09.600178053   10.78   9.7   G0 44 0
17 HD 277559 PM* 05 05 28.7085001691 +40 15 26.368658538   10.08   9.4   F5 50 0
18 HD 241253 PM* 05 09 56.9590196910 +05 33 26.743378965   10.24   9.4   G0 83 0
19 HD 246067 PM* 05 39 27.4340740248 +03 57 02.685222706       9.9   G0 47 0
20 HD 250792 PM* 06 03 14.8634898007 +19 21 38.692248180 9.89 9.898 9.310 8.954 8.547 G1 142 3
21 BD+33 1279a PM* 06 13 49.8285041918 +33 25 02.121695341   11.65   11.1   F8 26 0
22 CD-33 3337 PM* 06 54 47.8102286237 -33 44 49.020854453   9.56 9.03     F5 84 0
23 G 103-69 PM* 06 54 56.2978690642 +35 30 58.636763047   11.55   11.1   sdF2 28 0
24 HD 51754 PM* 06 58 38.5387307770 -00 28 49.697886299 9.60 9.567 9.009 8.663 8.334 G2V 109 0
25 CD-57 1633 HV* 07 06 28.9517777029 -57 27 29.118056344   10.04 9.54     F7V 85 0
26 CD-45 3283 PM* 07 34 18.5967102074 -45 16 42.875165214   11.08 10.43     G8V-VI 64 0
27 G 112-42 PM* 07 42 42.5726666616 -01 48 26.656242902   15.4       ~ 3 0
28 BD+00 2058 PM* 07 43 43.9667229236 -00 04 00.972592389   10.653 10.202 9.888 9.578 sdF 61 0
29 BD+00 2058B PM* 07 43 44.08665 -00 03 49.3349   11.741 11.253 10.909 10.593 ~ 39 0
30 HD 76932 PM* 08 58 43.9328634171 -16 07 57.805389219 6.47 6.39 5.86     G2VFe-1.8CH-1 364 0
31 G 114-42 PM* 09 10 44.8904327060 -03 48 09.628708542   13.281 12.746 12.403 12.052 ~ 37 0
32 G 46-31 SB* 09 17 04.0012875687 +03 01 29.628025488   11.39   10.6   ~ 59 0
33 HD 237822 PM* 09 36 49.5207689507 +57 54 41.011275376   10.59   9.6   G3V 37 0
34 BD+29 1925 SB* 09 38 50.6119318376 +28 24 08.564799375       10.2   G5 27 0
35 CD-43 6810 PM* 11 08 40.0960913641 -44 15 33.796755020   10.38 9.82     F8 52 0
36 HD 97320 Pe* 11 11 00.7344947834 -65 25 37.746274848   9.769 9.269     F3V 121 0
37 G 56-30 PM* 11 21 35.1061999725 +18 11 44.560256042   11.50   10.7   sd?G0 30 0
38 BD+20 2594 PM* 11 23 16.2308862209 +19 53 37.665333745   10.51   9.6   F9 65 0
39 BD+11 2369 PM* 11 32 34.1258815985 +10 54 11.309331363   10.73   9.7   G0 29 0
40 BD+26 2251 PM* 11 44 35.7048923618 +25 32 11.691354184   10.82   9.9   F6 77 0
41 BD+51 1696 PM* 11 46 35.1557706721 +50 52 54.682692534 10.32 10.47   9.5   sdG0 128 0
42 BD-21 3420 PM* 11 55 28.4583234970 -22 23 13.322785163   10.649 10.107     F5 56 0
43 HD 103723 PM* 11 56 36.0250188318 -21 25 09.826660968   10.554 10.091     F5/6V 67 0
44 HD 105004 PM* 12 05 24.8526214531 -26 35 43.746369085   10.96 10.39     F9 91 0
45 HD 106516 SB* 12 15 10.55731 -10 18 44.6354 6.44 6.57 6.11     F9VFe-1.7CH-0.7 386 0
46 BD+02 2541 PM* 12 26 59.8614367203 +01 33 58.402203150   11.23   9.9   G3 44 0
47 HD 111980 SB* 12 53 15.0528185218 -18 31 20.009066873 8.80 8.91 8.38     F7V 152 0
48 HD 113679 PM* 13 05 52.8243888123 -38 30 59.990798799   10.342 9.797     G2/3V 81 0
49 HD 114762 SB* 13 12 19.7467346230 +17 31 01.611425890 7.78         F9VgF8mF4+M6?V 504 1
50 G 150-40 PM* 13 48 52.1484169294 +27 40 09.478436733       10.5   sdF9 25 0
51 HD 120559 PM* 13 51 40.3897554726 -57 26 08.293465228 8.679 8.647 7.982 7.605 7.217 G7VFe-1.4CH-1 135 0
52 HD 121004 PM* 13 53 58.1163515488 -46 32 19.526169178   10.112 9.522     G2V 124 0
53 HD 126681 PM* 14 27 24.9096361739 -18 24 40.457119166   9.939 9.535     G3V 163 0
54 BD+06 2932 ** 14 43 17.97109 +05 49 39.7564           G6V 89 0
55 HD 132475 PM* 14 59 49.7649807130 -22 00 45.814964574 8.98 9.11 8.55     F5/6V 222 1
56 G 15-23 PM* 15 29 31.6793599360 +06 08 49.876684149   11.67   10.6   ~ 45 0
57 BD+42 2667 PM* 16 03 13.2989292029 +42 14 46.649595940   10.33   9.6   F5 130 0
58 HD 148816 PM* 16 30 28.4586643435 +04 10 41.603810207 7.75 7.81 7.28 6.82 6.49 F7V 279 0
59 HD 159482 PM* 17 34 43.0846515269 +06 00 51.750931202   8.95   8.0   G0V 143 0
60 BD+18 3423 PM* 17 38 15.6095483986 +18 33 25.484101675 10.17 10.27   9.4   F6V 115 0
61 HD 160693 PM* 17 39 36.8721114627 +37 11 01.504427710 8.94 8.92   8.0   G0 190 0
62 HD 163810 ** 17 58 38.4538029750 -13 05 49.654844460 10.15 10.23 9.63     G3V 133 0
63 HD 175179 PM* 18 54 23.2030233107 -04 36 18.624524830 9.56 9.61 9.03     G5V 103 0
64 HD 230409 PM* 19 00 43.3340149571 +19 04 28.416914989   10.78   9.6   G0 72 0
65 HD 177095 PM* 19 03 56.7108818517 -20 27 36.568176156   10.27 9.64     G6V 42 0
66 HD 179626 PM* 19 13 20.7187369501 -00 35 42.340961173   9.701 9.187 8.844 8.489 F5V 109 0
67 HD 189558 PM* 20 01 00.2452564415 -12 15 20.355884232   8.27 7.72     F8/G2V 169 1
68 BD+05 4481 PM* 20 20 24.5610079799 +06 01 52.824941814   10.75   10.8   G4 56 0
69 HD 193901 PM* 20 23 35.8472360557 -21 22 14.228814044 9.08 9.22 8.67 8.17 7.87 F7V 254 0
70 HD 194598 PM* 20 26 11.9185966774 +09 27 00.429262518 8.62 8.82 8.34 7.90 7.56 F8 283 0
71 HD 199289 PM* 20 58 08.5241060028 -48 12 13.460660433   8.82 8.30     F5V 101 0
72 HD 335471 PM* 21 03 06.1287885933 +29 28 56.213842723       9.7   G5 35 0
73 G 232-18 PM* 21 30 37.2926875560 +48 51 59.664581190       10.2   sd?G2 27 0
74 HD 205650 PM* 21 37 26.0309417494 -27 38 06.697112156   9.59 9.00     F6V 93 0
75 BD+26 4251 PM* 21 43 57.1238901563 +27 23 23.991146537       9.9   F6 72 0
76 BD+11 4725 SB* 22 05 40.6986865279 +12 22 36.239672531   10.19   9.2   G3 80 0
77 BD+07 4841 PM* 22 18 36.5061308735 +08 26 44.960669943   10.84   10.1   G0 96 0
78 G 127-26 PM* 22 23 49.0863062122 +24 23 33.134761334       10.2   F9 30 0
79 HD 222766 PM* 23 43 34.9168944594 -07 55 24.016486937   10.769 10.115 9.728 9.349 G5/6V 71 0

    Equat.    Gal    SGal    Ecl

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2020.01.19-19:42:56

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