2012ApJ...761...33L

Query : 2012ApJ...761...33L

2012ApJ...761...33L - Astrophys. J., 761, 33 (2012/December-2)

Tagging the chemical evolution history of the Large Magellanic Cloud disk.

LAPENNA E., MUCCIARELLI A., ORIGLIA L. and FERRARO F.R.

Abstract (from CDS):

We have used high-resolution spectra obtained with the multifiber facility FLAMES at the Very Large Telescope of the European Southern Observatory to derive kinematic properties and chemical abundances of Fe, O, Mg, and Si for 89 stars in the disk of the Large Magellanic Cloud (LMC). The derived metallicity and [α/Fe], obtained as the average of O, Mg, and Si abundances, allow us to draw a preliminary scheme of the star formation history of this region of the LMC. The derived metallicity distribution shows two main components: one component (comprising ∼84% of the sample) peaks at [Fe/H] = -0.48 dex and it shows an [α/Fe] ratio slightly under solar ([α/Fe] ∼ -0.1 dex). This population probably originated in the main star formation event that occurred 3-4 Gyr ago (possibly triggered by tidal capture of the Small Magellanic Cloud). The other component (comprising ∼16% of the sample) peaks at [Fe/H] ∼ -0 dex and it shows an [α/Fe] ∼0.2 dex. This population was probably generated during the long quiescent epoch of star formation between the first episode and the most recent bursts. Indeed, in our sample we do not find stars with chemical properties similar to the old LMC globular clusters nor to the iron-rich and α-poor stars recently found in the LMC globular cluster NGC 1718 and also predicted to be in the LMC field, thus suggesting that both of these components are small (<1%) in the LMC disk population.

Abstract Copyright: ∼

Journal keyword(s): Magellanic Clouds - stars: abundances - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/ApJ/761/33): table1.dat table3.dat table4.dat>

Nomenclature: Tables 1, 3-4: [LMO2012] NNNNN N=89 among (Nos 353-95454).

Simbad objects: 98

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Number of rows : 98
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 NGC 1718 Cl* 04 52 25.040 -67 03 08.50   13.01 12.25     ~ 77 0
4 OGLE LMC-LPV-8103 LP* 04 56 57.4347345120 -67 42 36.745229880     16.644   15.041 ~ 2 0
5 2MASS J04570560-6746433 * 04 57 05.601 -67 46 43.33           ~ 1 0
6 OGLE LMC-LPV-8243 LP* 04 57 08.3557994640 -67 45 52.931416536     16.831   15.368 ~ 2 0
7 [LMO2012] 91288 * 04 57 10.6654820304 -67 43 00.326358624           ~ 1 0
8 2MASS J04571145-6749152 * 04 57 11.454 -67 49 15.24           ~ 1 0
9 [LMO2012] 90466 * 04 57 11.7521517504 -67 48 07.415391564           ~ 1 0
10 [LMO2012] 93296 * 04 57 13.8434676984 -67 43 20.379363852           ~ 1 0
11 2MASS J04571536-6747035 * 04 57 15.3982690968 -67 47 03.569920944           ~ 1 0
12 OGLE LMC-LPV-8363 LP* 04 57 17.3855684749 -67 46 17.884858634         14.944 ~ 6 0
13 [LMO2012] 91139 * 04 57 22.6560602832 -67 47 41.596942236           ~ 1 0
14 OGLE LMC-LPV-8474 LP* 04 57 25.6186419648 -67 41 58.295519952     16.783   15.191 ~ 2 0
15 [LMO2012] 94210 * 04 57 32.3005052376 -67 45 58.730575968           ~ 1 0
16 [LMO2012] 91328 * 04 57 35.4349529664 -67 39 19.758347352           ~ 1 0
17 2MASS J04573829-6741486 * 04 57 38.291 -67 41 48.67           ~ 1 0
18 [LMO2012] 94652 * 04 57 48.8487412176 -67 46 56.736653448           ~ 1 0
19 [LMO2012] 92734 * 04 57 51.8530856904 -67 54 33.419508372           ~ 1 0
20 [LMO2012] 92585 * 04 57 52.5301100808 -67 49 27.464280168           ~ 1 0
21 2MASS J04575572-6745359 * 04 57 55.724 -67 45 35.92           ~ 1 0
22 OGLE LMC-LPV-8889 LP* 04 57 56.4280946736 -67 35 22.967017692     16.472   14.894 ~ 2 0
23 OGLE LMC-LPV-8980 LP* 04 58 04.6259818248 -67 44 38.942882736     16.820   15.472 ~ 2 0
24 [LMO2012] 90627 * 04 58 06.9043918128 -67 40 58.422930852           ~ 1 0
25 2MASS J04580784-6752443 * 04 58 07.842 -67 52 44.31           ~ 1 0
26 2MASS J04580902-6742256 * 04 58 09.029 -67 42 25.70           ~ 1 0
27 OGLE LMC-LPV-9039 LP* 04 58 09.1113384120 -67 51 00.509643324     17.065   15.601 ~ 2 0
28 [LMO2012] 93177 * 04 58 20.0453055888 -67 43 03.978867756           ~ 1 0
29 [LMO2012] 90119 * 04 58 21.6215032344 -67 54 17.209497600           ~ 1 0
30 OGLE LMC-LPV-9277 LP* 04 58 25.994 -67 52 42.06     16.874   15.287 ~ 2 0
31 OGLE LMC-LPV-9337 LP* 04 58 29.9701259088 -67 33 32.243332500     16.905 15.88 15.113 ~ 3 0
32 2MASS J04583367-6734039 * 04 58 33.6894967872 -67 34 03.909158904           ~ 1 0
33 [LMO2012] 92377 * 04 58 34.4049197712 -67 45 25.468997940           ~ 1 0
34 [LMO2012] 93474 * 04 58 37.6457674440 -67 33 51.975742212           ~ 1 0
35 [LMO2012] 93258 * 04 58 40.7784353640 -67 44 30.792261192           ~ 1 0
36 2MASS J04584169-6743580 * 04 58 41.7055098144 -67 43 58.208810304           ~ 1 0
37 OGLE LMC-LPV-9512 LP* 04 58 43.1796206208 -67 33 25.909953228     17.023   15.434 ~ 2 0
38 [LMO2012] 1980 * 04 58 45.6250449192 -67 44 59.294085540           ~ 1 0
39 [LMO2012] 1954 * 04 58 46.9189917048 -67 45 34.958826216           ~ 1 0
40 2MASS J04584909-6742215 * 04 58 49.095 -67 42 21.55           ~ 1 0
41 2MASS J04585007-6745102 dS* 04 58 50.1005353200 -67 45 10.385530776   21.636 21.365     ~ 2 0
42 [LMO2012] 2363 * 04 58 52.1608254288 -67 44 43.570986828           ~ 1 0
43 [LMO2012] 2353 * 04 58 54.6281850888 -67 44 32.612878896           ~ 1 0
44 MACHO 48.2984.1389 * 04 58 55.176 -67 34 09.12       16.29   ~ 2 0
45 2MASS J04585765-6744526 * 04 58 57.653 -67 44 52.64           ~ 1 0
46 2MASS J04590013-6734513 * 04 59 00.132 -67 34 51.36           ~ 1 0
47 [LMO2012] 91712 * 04 59 01.3995289032 -67 55 56.604946980           ~ 1 0
48 2MASS J04590168-6743397 * 04 59 01.7036281080 -67 43 39.927891972           ~ 1 0
49 OGLE LMC-LPV-9827 LP* 04 59 03.9413058288 -67 50 16.997174844     16.576 15.57 14.945 ~ 3 0
50 NGC 1786 Cl* 04 59 07.470 -67 44 45.44   10.1       ~ 152 0
51 [LMO2012] 94946 * 04 59 13.9307168496 -67 56 52.641318480           ~ 1 0
52 [LMO2012] 90522 * 04 59 22.0668265080 -67 51 11.483866764           ~ 1 0
53 OGLE LMC-LPV-10074 LP* 04 59 22.3275790704 -67 45 10.592944308     17.117   15.633 ~ 2 0
54 [LMO2012] 93243 * 04 59 24.2766885528 -67 54 16.387862472           ~ 1 0
55 OGLE LMC-LPV-10110 LP* 04 59 24.4795908336 -67 56 34.226752956     16.866   15.290 ~ 2 0
56 OGLE LMC-LPV-10117 LP* 04 59 25.1667112200 -67 52 53.729932620     16.586   14.983 ~ 2 0
57 OGLE LMC-LPV-10210 LP* 04 59 30.7794107640 -67 55 37.138289052     16.806   15.170 ~ 2 0
58 [LMO2012] 94404 * 04 59 36.5738414952 -67 34 36.288254856           ~ 1 0
59 2MASS J04593755-6752452 * 04 59 37.552 -67 52 45.27           ~ 1 0
60 OGLE LMC-LPV-10337 LP* 04 59 39.665 -67 55 05.76     17.150   15.595 ~ 2 0
61 [LMO2012] 93106 * 04 59 40.7914207176 -67 43 20.097105024           ~ 1 0
62 OGLE LMC-LPV-10352 LP* 04 59 41.0362176240 -67 48 24.295123584     16.632   15.179 ~ 2 0
63 OGLE LMC-LPV-10376 LP* 04 59 42.163 -67 50 21.62     16.878   15.212 ~ 2 0
64 2MASS J04594810-6754056 * 04 59 48.105 -67 54 05.61           ~ 1 0
65 [LMO2012] 93253 * 04 59 48.9546612456 -67 47 59.735146128           ~ 1 0
66 [LMO2012] 92782 * 04 59 48.9589168224 -67 53 25.878623748           ~ 1 0
67 2MASS J04594916-6752541 * 04 59 49.164 -67 52 54.17           ~ 1 0
68 [LMO2012] 91617 * 04 59 55.0149924960 -67 44 28.331053008           ~ 1 0
69 OGLE LMC-LPV-10578 LP* 04 59 56.0093959680 -67 48 36.636576048     16.665   15.194 ~ 3 0
70 [LMO2012] 92549 * 04 59 56.0293309728 -67 49 05.961023148           ~ 1 0
71 [LMO2012] 90958 * 04 59 59.5049120928 -67 49 47.206534980           ~ 1 0
72 [LMO2012] 90320 * 05 00 03.7777069992 -67 49 36.086459628           ~ 1 0
73 [LMO2012] 94426 * 05 00 07.1265767952 -67 47 58.030054368           ~ 1 0
74 2MASS J05000806-6749523 * 05 00 08.066 -67 49 52.32           ~ 1 0
75 [LMO2012] 93353 * 05 00 08.0816074368 -67 50 52.083638628           ~ 1 0
76 [LMO2012] 94612 * 05 00 12.6719327736 -67 50 28.127255172           ~ 1 0
77 [LMO2012] 92163 * 05 00 15.3937833768 -67 48 21.842341272           ~ 1 0
78 OGLE LMC-LPV-10878 LP* 05 00 16.535 -67 47 31.83     17.002   15.466 ~ 2 0
79 [LMO2012] 92400 * 05 00 17.3818977432 -67 45 21.377127456           ~ 1 0
80 OGLE LMC-LPV-10947 LP* 05 00 20.0345095608 -67 50 40.400993148     16.242   14.566 ~ 5 0
81 OGLE LMC-LPV-10954 LP* 05 00 20.3704351824 -67 49 56.948436408     16.769   15.293 ~ 2 0
82 [LMO2012] 91426 * 05 00 20.6240942112 -67 35 41.055558792           ~ 1 0
83 [LMO2012] 93160 * 05 00 23.8009158240 -67 45 13.356395100           ~ 1 0
84 [LMO2012] 94044 * 05 00 28.8515910864 -67 36 24.922424484           ~ 1 0
85 [LMO2012] 94358 * 05 00 28.9091243400 -67 42 00.725103324           ~ 1 0
86 OGLE LMC-LPV-11210 LP* 05 00 36.2080115424 -67 43 34.482311220     16.698   14.902 ~ 2 0
87 [LMO2012] 94593 * 05 00 39.7206065352 -67 44 26.110759488           ~ 1 0
88 [LMO2012] 90545 * 05 00 42.0923670504 -67 44 47.229145296           ~ 1 0
89 [LMO2012] 93729 * 05 00 43.2470869800 -67 44 05.206571736           ~ 1 0
90 [LMO2012] 92160 * 05 00 53.0245877496 -67 38 21.643716012           ~ 1 0
91 [LMO2012] 92831 * 05 00 55.5627775080 -67 44 18.824640072           ~ 1 0
92 [LMO2012] 94711 * 05 00 58.9693267968 -67 40 43.618814508           ~ 1 0
93 [LMO2012] 93126 * 05 01 12.3831272688 -67 41 54.207199248           ~ 1 0
94 NAME LMC Bar PoG 05 22 08 -69 23.5           ~ 343 0
95 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
96 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
97 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
98 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2

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