2008A&A...480..379P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:11:00

2008A&A...480..379P - Astronomy and Astrophysics, volume 480, 379-395 (2008/3-3)

Chemical abundances in LMC stellar populations. I. The inner disk sample.

POMPEIA L., HILL V., SPITE M., COLE A., PRIMAS F., ROMANIELLO M., PASQUINI L., CIONI M.-R. and SMECKER-HANE T.

Abstract (from CDS):

We have used FLAMES (the Fibre Large Array Multi Element Spectrograph) at the VLT-UT2 telescope to obtain spectra of a large sample of red giant stars from the inner disk of the LMC, ∼2kpc from the center of the galaxy. We investigate the chemical abundances of key elements to understand the star formation and evolution of the LMC disk: heavy and light [s-process/Fe] and [α/Fe] give constraints on the time scales of formation of the stellar population. Cu, Na, Sc, and the iron-peak elements are also studied aiming to better understand the build up of the elements of this population and the origin of these elements. We aim to provide a more complete picture of the LMC's evolution by compiling a large sample of field star abundances. LTE abundances were derived using line spectrum synthesis or equivalent width analysis. We used OSMARCS model atmospheres and an updated line list. We find that the alpha-elements Ca, Si, and Ti show lower [X/Fe] ratios than Galactic stars at the same [Fe/H], with most [Ca/Fe] being subsolar. The [O/Fe] and [Mg/Fe] ratios are slightly deficient, with Mg showing some overlap with the Galactic distribution, while Sc and Na follow the underabundant behavior of Ca, with subsolar distributions. For the light s-process elements Y and Zr, we find underabundant values compared to their Galactic counterparts. The [La/Fe] ratios are slightly overabundant relative to the galactic pattern showing low scatter, while the [Ba/Fe] are enhanced, with a slight increasing trend for metallicities [Fe/H]>-1dex. The [heavy-s/light-s] ratios are high, showing a slow, increasing trend with metallicity. We were surprised to find an offset for three of the iron-peak elements. We found an offset for the [iron-peak/Fe] ratios of Ni, Cr, and Co, with an underabundant pattern and subsolar values, while Vanadium ratios track the solar value. Copper shows very low abundances in our sample for all metallicities, compatible with those of the Galaxy only for the most metal-poor stars. The overall chemical distributions of this LMC sample indicates a slower star formation history relative to that of the solar neighborhood, with a higher contribution from typeIa supernovae relative to typeII supernovae.

Abstract Copyright:

Journal keyword(s): stars: abundances - galaxies: Magellanic Clouds - Galaxy: abundances - galaxies: evolution

VizieR on-line data: <Available at CDS (J/A+A/480/379): table1.dat table3.dat table4.dat abund.dat>

Nomenclature: Table 4: [PHS2008] RGB NNNN N=120 among (Nos 499-1118).

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 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10902 1
2 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1116 4
3 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1473 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
5 2MASS J05095252-7115084 RG* 05 09 52.5094019662 -71 15 08.589569115     17.214     ~ 2 0
6 2MASS J05095756-7116288 RG* 05 09 57.5460417457 -71 16 29.013740149     17.261     ~ 2 0
7 2MASS J05100529-7112259 RG* 05 10 05.2748731438 -71 12 26.137190941     17.154     ~ 2 0
8 2MASS J05100659-7115514 RG* 05 10 06.5670231497 -71 15 51.574114980     17.156     ~ 4 0
9 2MASS J05100845-7109582 RG* 05 10 08.4675574789 -71 09 58.357775077     17.229     ~ 3 0
10 2MASS J05102155-7118506 RG* 05 10 21.5382222587 -71 18 50.721095123     17.415     ~ 2 0
11 2MASS J05103055-7116158 RG* 05 10 30.5360352945 -71 16 15.990838751     17.314     ~ 2 0
12 2MASS J05103395-7112074 RG* 05 10 33.9530104510 -71 12 07.710072314     17.144     ~ 2 0
13 2MASS J05104728-7119320 RG* 05 10 47.2437404359 -71 19 31.978019961     17.167     ~ 2 0
14 2MASS J05104862-7109301 RG* 05 10 48.6156840325 -71 09 30.202459308     17.628     ~ 2 0
15 2MASS J05104928-7110057 RG* 05 10 49.2965914212 -71 10 05.863813918     17.140     ~ 2 0
16 2MASS J05104950-7107338 RG* 05 10 49.4952204580 -71 07 33.943406209     17.291     ~ 2 0
17 2MASS J05105703-7111340 RG* 05 10 57.0299938978 -71 11 34.214694111     16.994     ~ 3 0
18 2MASS J05110667-7111205 RG* 05 11 06.6698239429 -71 11 20.729320913     17.319     ~ 2 0
19 2MASS J05110701-7108413 RG* 05 11 07.0333805750 -71 08 41.388338247     17.308     ~ 2 0
20 2MASS J05111325-7120037 RG* 05 11 13.2840798514 -71 20 03.782124646     17.112     ~ 2 0
21 2MASS J05111461-7118573 RG* 05 11 14.6542646611 -71 18 57.317529667     17.269     ~ 3 0
22 2MASS J05111615-7116401 RG* 05 11 16.1633168552 -71 16 40.132798300     17.287     ~ 3 0
23 2MASS J05111734-7115235 RG* 05 11 17.34 -71 15 23.6     17.343     ~ 2 0
24 2MASS J05111922-7112564 LP* 05 11 19.22 -71 12 56.5     17.061   15.506 ~ 3 0
25 2MASS J05112068-7108113 RG* 05 11 20.7066848111 -71 08 11.431006169     17.041     ~ 2 0
26 2MASS J05112258-7107277 RG* 05 11 22.584 -71 07 27.75     17.005     ~ 3 0
27 2MASS J05112287-7116589 RG* 05 11 22.9071373248 -71 16 59.012790595     17.355     ~ 3 0
28 2MASS J05113508-7112309 RG* 05 11 35.08 -71 12 30.9     17.599     ~ 3 0
29 2MASS J05113581-7113336 RG* 05 11 35.81 -71 13 33.6     17.284     ~ 3 0
30 2MASS J05114466-7107176 RG* 05 11 44.6789407269 -71 07 17.660565387     17.152     ~ 3 0
31 2MASS J05114880-7113428 RG* 05 11 48.8054211797 -71 13 42.871185115     17.197     ~ 2 0
32 2MASS J05114888-7111492 RG* 05 11 48.8825979116 -71 11 49.317159526     17.122     ~ 2 0
33 2MASS J05115657-7108489 RG* 05 11 56.5829353192 -71 08 48.955698223     17.264     ~ 2 0
34 2MASS J05120180-7117002 RG* 05 12 01.7955983688 -71 17 00.357184150     17.255     ~ 2 0
35 2MASS J05120481-7113402 RG* 05 12 04.8062412488 -71 13 40.345431021     17.131     ~ 2 0
36 2MASS J05120852-7116597 RG* 05 12 08.5354010375 -71 16 59.836265139     17.132     ~ 2 0
37 2MASS J05121657-7108570 RG* 05 12 16.5582827696 -71 08 57.027839911     17.310     ~ 3 0
38 2MASS J05122530-7119025 RG* 05 12 25.3123587559 -71 19 02.529558780     17.279     ~ 2 0
39 2MASS J05122551-7112106 RG* 05 12 25.5083924642 -71 12 10.715039363     17.191     ~ 2 0
40 2MASS J05123409-7113324 RG* 05 12 34.0915458247 -71 13 32.413266324     17.203     ~ 2 0
41 2MASS J05123774-7118119 RG* 05 12 37.7563458292 -71 18 12.001427448     17.111     ~ 2 0
42 2MASS J05124208-7110018 RG* 05 12 42.0917315208 -71 10 01.835088701     17.214     ~ 2 0
43 2MASS J05124460-7109195 RG* 05 12 44.6140464026 -71 09 19.589409748     17.174     ~ 2 0
44 2MASS J05124558-7116301 RG* 05 12 45.5907670165 -71 16 30.203249015     17.393     ~ 2 0
45 2MASS J05125047-7107463 RG* 05 12 50.48 -71 07 46.3     17.661     ~ 2 0
46 2MASS J05130066-7116289 RG* 05 13 00.6671663293 -71 16 28.994951143     17.193     ~ 2 0
47 2MASS J05130400-7113289 RG* 05 13 04.0210517874 -71 13 28.985667756     17.400     ~ 2 0
48 2MASS J05130454-7113055 RG* 05 13 04.5530317039 -71 13 05.575578209     17.095     ~ 2 0
49 2MASS J05130497-7115406 RG* 05 13 04.9783933778 -71 15 40.728749856     17.023     ~ 2 0
50 2MASS J05131266-7118005 RG* 05 13 12.6847345627 -71 18 00.584447518     16.958     ~ 3 0
51 2MASS J05132454-7109519 RG* 05 13 24.5658105764 -71 09 51.994634337     17.168     ~ 2 0
52 2MASS J05133509-7109322 RG* 05 13 35.1032908948 -71 09 32.178085694     17.152     ~ 2 0
53 2MASS J05134131-7118477 RG* 05 13 41.3143017383 -71 18 47.713242687     17.054     ~ 2 0
54 2MASS J05140805-7117297 RG* 05 14 08.0513105363 -71 17 29.831626924     17.071     ~ 2 0
55 2MASS J05141536-7107463 RG* 05 14 15.3708912410 -71 07 46.286129351     17.215     ~ 2 0
56 2MASS J05142327-7107446 RG* 05 14 23.2554970445 -71 07 44.696712542     17.205     ~ 2 0
57 2MASS J05142677-7119303 RG* 05 14 26.7729271790 -71 19 30.461055213     17.249     ~ 2 0
58 2MASS J05143449-7112462 RG* 05 14 34.49 -71 12 46.3     17.251     ~ 2 0
59 2MASS J05143617-7109412 RG* 05 14 36.1987033840 -71 09 41.205870905     17.202     ~ 2 0
60 2MASS J05144229-7110108 RG* 05 14 42.3078612527 -71 10 10.772040363     17.266     ~ 2 0
61 2MASS J05144969-7110095 RG* 05 14 49.7128204863 -71 10 09.586907209     17.320     ~ 2 0
62 2MASS J05145465-7113031 RG* 05 14 54.6509019426 -71 13 03.205292374     17.023     ~ 2 0
63 NAME LMC Bar ? 05 22 08 -69 23.5           ~ 258 0
64 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
65 ESO 121-3 Cl* 06 02 02.0 -60 31 20   14.91 14.04     ~ 104 0
66 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 991 0
67 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
68 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1045 1
69 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1737 2
70 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-21:11:00

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