2020A&A...634A.130B


Query : 2020A&A...634A.130B

2020A&A...634A.130B - Astronomy and Astrophysics, volume 634A, 130-130 (2020/2-1)

Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. VII. Lithium.

BENSBY T., FELTZING S., YEE J.C., JOHNSON J.A., GOULD A., ASPLUND M., MELENDEZ J. and LUCATELLO S.

Abstract (from CDS):

Lithium abundances are presented for 91 dwarf and subgiant stars in the Galactic bulge. The analysis is based on line synthesis of the 7Li line at 6707 Å in high-resolution spectra obtained during gravitational microlensing events, when the brightnesses of the targets were highly magnified. Our main finding is that bulge stars at sub-solar metallicities that are older than about eight billion years do not show any sign of Li production; that is, the Li trend with metallicity is flat or even slightly declining. This indicates that no lithium was produced during the first few billion years in the history of the bulge. This finding is essentially identical to what is seen for the (old) thick disk stars in the solar neighbourhood, and adds another piece of evidence for a tight connection between the metal-poor bulge and the Galactic thick disk. For the bulge stars younger than about eight billion years, the sample contains a group of stars at very high metallicities at [Fe/H]~=+0.4 that have lithium abundances in the range A(Li)=2.6-2.8. In the solar neighbourhood the lithium abundances have been found to peak at A(Li)~=3.3 at [Fe/H]~=+0.1 and then decrease by 0.4-0.5dex when reaching [Fe/H]~=+0.4. The few bulge stars that we have at these metallicities seem to support this declining A(Li) trend. This could indeed support the recent claim that the low A(Li) abundances at the highest metallicities seen in the solar neighbourhood could be due to stars from the inner disk, or the bulge region, that have migrated to the solar neighbourhood.

Abstract Copyright: © ESO 2020

Journal keyword(s): gravitational lensing: micro - Galaxy: bulge - Galaxy: formation - Galaxy: evolution - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/634/A130): table1.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 - 2022
#notes
1 HD 14397 PM* 02 18 02.3348918448 -50 49 07.516941132   9.16 8.52     G3V 18 0
2 EWS 2012-BLG-270 * 17 14 42.460 -29 35 50.40           ~ 5 0
3 OGLE BLG613.8 68613 * 17 32 49.61 -29 23 10.6           ~ 6 0
4 EWS 2012-BLG-26 * 17 34 18.7004610096 -27 08 33.867112596           ~ 42 1
5 OGLE BLG604.24 29952 * 17 43 38.53 -35 05 12.1           ~ 4 0
6 OGLE BLG603.5 113678 * 17 45 00.65 -34 32 49.5           ~ 7 0
7 OGLE BLG660.5 81711 * 17 45 13.37 -33 29 50.4           ~ 4 0
8 EWS 2013-BLG-1938 * 17 46 01.890 -34 12 31.50           ~ 3 0
9 MOA 2009-BLG-456 * 17 48 56.40 -34 13 29.7           ~ 7 0
10 EWS 2011-BLG-462 * 17 51 40.150 -29 53 26.15           ~ 12 0
11 MOA 2010-BLG-78 * 17 52 01.650 -30 24 25.63           ~ 6 0
12 EWS 2013-BLG-1768 * 17 52 26.580 -31 36 43.80           ~ 3 0
13 OGLE BLG503.10 121377 * 17 52 48.18 -35 00 51.4           ~ 4 0
14 EWS 2013-BLG-835 * 17 52 59.390 -29 05 57.10           ~ 3 0
15 EWS 2013-BLG-1125 * 17 53 27.010 -29 47 34.10           ~ 3 0
16 OGLE BLG535.9 35861 * 17 54 02.42 -32 35 31.6           ~ 4 0
17 EWS 2013-BLG-1793 * 17 54 04.690 -29 38 04.10           ~ 3 0
18 MOA 2006-BUL-99 * 17 54 10.99 -35 13 38.0           G 13 0
19 NAME OGLE 2011-BLG-012N * 17 54 11.320 -30 05 21.56           ~ 5 0
20 MOA 2008-BLG-310 * 17 54 14.53 -34 46 41.0           GV 47 1
21 MOA 2013-BLG-68 * 17 54 21.860 -31 11 39.95           ~ 3 0
22 MOA 2011-BLG-104 * 17 54 22.480 -29 50 01.67           ~ 11 0
23 EWS 2013-BLG-1114 * 17 54 24.400 -28 56 32.10           ~ 3 0
24 OGLE BLG507.25 76512 * 17 54 48.34 -31 25 57.8           ~ 5 0
25 EWS 2012-BLG-617 * 17 54 53.870 -31 08 19.10           ~ 6 0
26 EWS 2015-BLG-78 * 17 55 30.690 -27 57 36.50           ~ 3 0
27 MOA 2013-BLG-551 * 17 55 31.980 -29 15 13.80           ~ 10 0
28 OGLE BLG507.14 156979 * 17 55 42.33 -31 53 34.3           ~ 4 0
29 MOA 2009-BLG-493 * 17 55 46.13 -28 48 25.5           ~ 9 0
30 OGLE BLG507.31 100807 * 17 55 59.48 -31 16 35.8           ~ 4 0
31 EWS 2014-BLG-1469 * 17 56 07.540 -30 57 13.00           ~ 3 0
32 MOA 2010-BLG-285 * 17 56 48.160 -30 00 39.47           ~ 7 0
33 OGLE BLG507.13 70237 * 17 56 52.39 -31 46 54.5           ~ 5 0
34 MOA 2008-BLG-311 * 17 56 53.65 -31 23 49.9           ~ 15 0
35 EWS 2011-BLG-1072 * 17 56 53.940 -28 50 53.31           ~ 5 0
36 MOA 2010-BLG-523 RS* 17 57 08.870 -29 44 58.40           ~ 12 0
37 MOA 2011-BLG-336 * 17 57 16.620 -32 39 57.15           ~ 11 0
38 MOA 2011-BLG-174 * 17 57 20.620 -30 22 47.57           ~ 5 0
39 MOA 2012-BLG-22 * 17 57 40.970 -27 29 56.49           ~ 5 0
40 MOA 2009-BLG-489 * 17 57 46.7236172064 -28 38 57.070782024           ~ 8 0
41 MOA 2009-BLG-259 * 17 57 57.51 -29 11 39.4           ~ 7 0
42 EWS 2007-BUL-514 * 17 58 03.09 -27 31 05.7           ~ 13 0
43 EWS 2012-BLG-816 * 17 58 15.980 -29 57 21.45           ~ 4 0
44 OGLE BLG509.28 42093 * 17 58 16.8493504536 -33 46 18.724805940           ~ 4 0
45 EWS 2009-BLG-76 * 17 58 31.93 -29 12 17.9           ~ 12 0
46 MOA 2012-BLG-532 * 17 58 41.130 -30 02 11.80           ~ 7 0
47 MOA 2013-BLG-605 * 17 58 42.880 -29 23 53.60           ~ 16 0
48 OGLE BLG507.19 119151 * 17 58 56.67 -31 26 31.1           ~ 6 0
49 MOA 2014-BLG-131 * 17 59 02.500 -31 01 54.70           ~ 3 0
50 EWS 2012-BLG-1156 * 18 00 35.950 -28 11 15.20           ~ 5 0
51 EWS 2012-BLG-1534 * 18 00 46.350 -28 01 00.30           ~ 5 0
52 MOA 2009-BLG-174 * 18 02 07.70 -31 25 26.4           FV 8 0
53 MOA 2009-BLG-475 * 18 02 27.46 -27 26 49.4           ~ 8 0
54 OGLE BLG516.30 79355 * 18 02 29.58 -33 06 32.0           ~ 4 0
55 MOA 2012-BLG-291 * 18 02 43.080 -28 23 00.86           ~ 6 0
56 MOA 2013-BLG-402 * 18 03 00.140 -29 54 24.42           ~ 4 0
57 MOA 2011-BLG-445 * 18 04 45.630 -28 35 44.06           ~ 5 0
58 EWS 2008-BUL-209 * 18 04 49.84 -29 42 33.2           ~ 12 0
59 OGLE BUL-SC33 164492 * 18 05 05.28 -28 34 41.7           ~ 34 0
60 MOA 2010-BLG-49 * 18 05 07.020 -26 46 12.79           ~ 6 0
61 MOA 2010-BLG-37 * 18 05 17.930 -27 56 13.21           ~ 6 0
62 MOA 2007-BLG-379 ** 18 05 24.43 -26 25 18.8           ~ 44 1
63 EWS 2013-BLG-1868 * 18 05 35.560 -30 53 06.50           ~ 3 0
64 EWS 2012-BLG-521 * 18 05 36.8004591912 -25 45 47.975039460           ~ 5 0
65 OGLE BLG513.17 85619 * 18 05 55.57 -29 40 56.3           ~ 4 0
66 MOA 2012-BLG-288 * 18 05 57.720 -27 42 43.20           ~ 12 0
67 MOA 2009-BLG-133 * 18 06 32.85 -31 30 11.4           ~ 8 0
68 EWS 2013-BLG-446 * 18 06 56.180 -31 39 27.20           ~ 6 0
69 OGLE BLG519.14 123254 * 18 07 04.2329670288 -28 03 58.309956360           ~ 7 0
70 EWS 2006-BUL-265 * 18 07 18.88 -27 47 42.7           G 15 0
71 OGLE BLG519.22 117841 * 18 07 43.23 -27 48 50.1           ~ 3 0
72 OGLE BLG520.13 53669 * 18 08 02.17 -29 28 11.3           ~ 6 0
73 OGLE BLG518.21 8862 * 18 08 39.19 -26 40 44.8           ~ 4 0
74 MOA 2010-BLG-311 * 18 08 49.980 -25 57 04.27           ~ 11 0
75 OGLE BLG518.3 140178 * 18 08 52.98 -27 16 04.1           ~ 4 0
76 OGLE BLG520.11 172127 * 18 09 00.33 -29 14 12.7           ~ 7 0
77 OGLE BLG573.28 60514 * 18 09 41.13 -31 11 04.7           ~ 6 0
78 EWS 2012-BLG-1526 * 18 09 43.130 -28 48 45.20           ~ 5 0
79 EWS 2012-BLG-211 * 18 10 10.960 -25 01 40.20           ~ 6 0
80 MOA 2011-BLG-34 * 18 10 12.2722102032 -27 32 02.595693696           ~ 7 0
81 OGLE BLG519.26 139638 * 18 10 16.85 -27 37 59.0           ~ 6 0
82 MOA 2012-BLG-410 * 18 10 22.620 -25 10 16.83           ~ 5 0
83 EWS 2013-BLG-1259 * 18 10 23.340 -27 58 45.60           ~ 3 0
84 MOA 2011-BLG-90 * 18 10 29.850 -26 38 43.03           ~ 9 0
85 OGLE BLG518.17 141255 * 18 10 56.83 -26 33 48.5           ~ 5 0
86 OGLE BLG545.16 79421 * 18 10 56.92 -25 01 38.3           ~ 3 0
87 OGLE BLG525.25 58563 * 18 11 27.40 -29 41 02.8           ~ 7 0
88 MOA 2012-BLG-202 * 18 12 34.8686940936 -25 02 59.308913076           ~ 5 0
89 MOA 2013-BLG-517 * 18 13 36.420 -27 43 22.83           ~ 3 0
90 OGLE BLG522.11 4130 * 18 14 47.62 -26 24 38.9           ~ 4 0
91 OGLE BLG523.18 72530 * 18 16 06.66 -27 11 06.0           ~ 4 0
92 OGLE BLG529.24 95835 * 18 16 53.61 -25 31 31.0           ~ 4 0
93 MACHO 97-BLG-47 Lev 18 21 01.8 -28 46 46           ~ 2 0
94 MACHO 97-BLG-45 Lev 18 21 01.80 -28 46 45.0     19.8     ~ 11 0
95 NAME Galactic Bulge reg ~ ~           ~ 3926 0

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2022.09.24-17:40:53

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