2017A&A...598A.101J


Query : 2017A&A...598A.101J

2017A&A...598A.101J - Astronomy and Astrophysics, volume 598A, 101-101 (2017/2-1)

Abundances of disk and bulge giants from high-resolution optical spectra. II. O, Mg, Co, and Ti in the bulge sample.

JONSSON H., RYDE N., SCHULTHEIS M. and ZOCCALI M.

Abstract (from CDS):

Context. Determining elemental abundances of bulge stars can, via chemical evolution modeling, help to understand the formation and evolution of the bulge. Recently there have been claims both for and against the bulge having a different [α/Fe] versus [Fe/H] trend as compared to the local thick disk. This could possibly indicate a faster, or at least different, formation timescale of the bulge as compared to the local thick disk.
Aims. We aim to determine the abundances of oxygen, magnesium, calcium, and titanium in a sample of 46 bulge K giants, 35 of which have been analyzed for oxygen and magnesium in previous works, and compare this sample to homogeneously determined elemental abundances of a local disk sample of 291 K giants.
Methods. We used spectral synthesis to determine both the stellar parameters and elemental abundances of the bulge stars analyzed here. We used the exact same method that we used to analyze the comparison sample of 291 local K giants in Paper I of this series.
Results. Compared to the previous analysis of the 35 stars in our sample, we find lower [Mg/Fe] for [Fe/H]>-0.5, and therefore contradict the conclusion about a declining [O/Mg] for increasing [Fe/H]. We instead see a constant [O/Mg] over all the observed [Fe/H] in the bulge. Furthermore, we find no evidence for a different behavior of the alpha-iron trends in the bulge as compared to the local thick disk from our two samples.

Abstract Copyright: © ESO, 2017

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

Nomenclature: Tables 1-2: [JRS2017] SW-NN N=11 among (Nos 09-76).

Errata: erratum vol. 600, artc. C2 (2017)

Simbad objects: 48

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Number of rows : 48
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14383 0
2 [JRS2017] SW-76 RG* 17 58 54.2085234528 -29 12 09.676139544     16.943     K 4 0
3 [JRS2017] SW-34 RG* 17 58 54.4360287048 -29 11 20.185484892     16.559     K 4 0
4 [JRS2017] SW-71 RG* 17 58 58.2657971928 -29 12 57.330584280     16.892     K 4 0
5 [JRS2017] SW-33 RG* 17 59 03.3547079688 -29 10 25.969038276     16.549     K 4 0
6 [JRS2017] SW-43 RG* 17 59 04.0698009240 -29 13 30.607587624     16.606     K 4 0
7 [JRS2017] SW-27 RG* 17 59 04.4745435336 -29 10 21.048271932     16.484     K 4 0
8 [JRS2017] SW-09 RG* 17 59 04.5512322227 -29 10 36.912761115     16.153     K 4 0
9 [JRS2017] SW-15 RG* 17 59 04.7684747016 -29 12 15.128003448     16.326     K 4 0
10 [JRS2017] SW-18 RG* 17 59 06.4605128928 -29 10 30.917477532     16.410     K 4 0
11 [JRS2017] SW-28 RG* 17 59 07.0225265280 -29 13 11.685839160     16.485     K 4 0
12 [JRS2017] SW-17 RG* 17 59 08.1636770016 -29 11 20.465566548     16.388     K 4 0
13 [LHZ2007] BW-b1 * 18 03 34.7323788120 -29 54 34.173067068           K 5 0
14 2MASS J18033691-3007047 RG* 18 03 36.9106653672 -30 07 04.745611884     18.387   14.272 K 24 0
15 2MASS J18033716-2954227 * 18 03 37.1625416808 -29 54 22.692610440     17.994   14.29 K 18 0
16 UCAC4 300-175366 * 18 03 51.8482129224 -30 06 28.428365088     16.42 15.39 14.430 K 14 0
17 [LHZ2007] BW-b8 * 18 04 02.8812818016 -30 01 29.696067624     16.42   14.69 K 6 0
18 2MASS J18041328-2958182 RG* 18 04 13.2871085664 -29 58 18.229131228     18.832   14.45 K 20 0
19 [LHZ2007] BW-b2 * 18 04 23.9678705568 -30 05 58.307467200     16.58   14.68 K 13 0
20 [LHZ2007] BW-f5 * 18 04 39.6273863808 -29 55 20.251816752     15.88   14.28 K 12 0
21 [LHZ2007] BW-f7 * 18 04 43.9478275704 -30 03 15.741132480     16.31   14.51 K 10 0
22 2MASS J18081265-2550046 RG* 18 08 12.6350577792 -25 50 04.519528584     18.490     K 11 0
23 [LHZ2007] B3-b1 * 18 08 15.8385193824 -25 42 09.855737172       15.82   K 12 0
24 2MASS J18081617-2543192 RG* 18 08 16.1746892256 -25 43 19.196413356     18.514     K 11 0
25 2MASS J18082459-2548444 RG* 18 08 24.5996840952 -25 48 44.483739336     18.915   16.488 K 14 0
26 [LHZ2007] B3-f4 * 18 08 44.2853172024 -26 00 25.093971936           K 11 0
27 [LHZ2007] B3-f3 * 18 08 49.6267569480 -25 40 36.914490084       15.79   K 11 0
28 2MASS J18090052-2548070 RG* 18 09 00.5304214104 -25 48 06.862106124     18.345     K 13 0
29 [LHZ2007] B3-f2 * 18 09 15.6072180024 -25 57 32.729925420           K 10 0
30 2MASS J18091653-2549261 RG* 18 09 16.5364901832 -25 49 26.057581428     18.659   16.355 K 14 0
31 [LHZ2007] B3-f7 * 18 09 23.6917185792 -25 50 38.189479848           K 11 0
32 [LHZ2007] B6-b6 * 18 09 49.1021687256 -31 50 07.637646156     17.793   14.39 K 13 0
33 [LHZ2007] B6-b1 * 18 09 50.4778882656 -31 40 51.665028312     17.995   14.29 K 13 0
34 2MASS J18095595-3145462 * 18 09 55.9582700568 -31 45 46.287594144     18.397   16.290 K 16 0
35 2MASS J18095684-3143225 * 18 09 56.8499945520 -31 43 22.561115196     17.263   14.04 K 14 0
36 2MASS J18100445-3141452 * 18 10 04.4608354104 -31 41 45.275386416     17.901   15.960 K 16 0
37 [LHZ2007] B6-b4 * 18 10 07.7796048816 -31 52 41.407211028     17.842   14.40 K 13 0
38 2MASS J18101772-3141551 * 18 10 17.7263996304 -31 41 55.191925176     17.255   14.17 K 14 0
39 [LHZ2007] B6-b3 * 18 10 19.0674139272 -31 40 28.174734948     17.705   14.47 K 13 0
40 [LHZ2007] B6-b5 * 18 10 37.3810094112 -31 40 29.143049772     17.711   14.37 K 13 0
41 [LHZ2007] B6-f5 * 18 10 41.5177756536 -31 40 11.884993968     17.632   14.17 K 13 0
42 [LHZ2007] B6-f7 * 18 10 52.3070057160 -31 46 42.144199248     17.841   15.950 K 15 0
43 [LHZ2007] BL-1 * 18 34 58.5116755944 -34 33 15.241710240       15.20   K 10 0
44 [LHZ2007] BL-4 * 18 35 21.1118561256 -34 44 48.100128864           K 10 0
45 [LHZ2007] BL-3 * 18 35 27.5111505192 -34 31 59.344885488           K 10 0
46 [LHZ2007] BL-7 * 18 35 57.2601682896 -34 38 04.693853292           K 10 0
47 [LHZ2007] BL-5 * 18 36 01.0025929368 -34 31 47.930833020           K 10 0
48 NAME Galactic Bulge reg ~ ~           ~ 4290 0

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