2009ApJ...695L.134M

Query : 2009ApJ...695L.134M

2009ApJ...695L.134M - Astrophys. J., 695, L134-L139 (2009/April-3)

Looking outside the galaxy: the discovery of chemical anomalies in three old Large Magellanic Cloud clusters.

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

Abstract (from CDS):

By using the multifiber spectrograph FLAMES mounted at the ESO-VLT, we have obtained high-resolution spectra for 18 giant stars, belonging to three old globular clusters of the Large Magellanic Cloud (namely NGC 1786, 2210, and 2257). While stars in each cluster showed quite homogeneous iron content, within a few cents of dex (the mean values being [Fe/H]= -1.75 ± 0.01 dex, -1.65±0.02 dex and -1.95±0.02 dex for NGC 1786, 2210, and 2257, respectively), we have detected significant inhomogeneities for the [Na/Fe], [Al/Fe], [O/Fe], and [Mg/Fe] abundance ratios, with evidence of [O/Fe] versus [Na/Fe] and [Mg/Fe] versus [Al/Fe] anticorrelations. The trends detected nicely agree with those observed in Galactic Globular Clusters, suggesting that such abundance anomalies are ubiquitous features of old stellar systems and they do not depend on the parent galaxy environment. In NGC 1786 we also detected two extreme O-poor, Na-rich stars. This is the first time that a firm signature of extreme chemical abundance anomalies has been found in an extragalactic stellar cluster.

Abstract Copyright: ∼

Journal keyword(s): globular clusters: individual (NGC 1786, NGC 2210, NGC 2257) - Magellanic Clouds - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/ApJ/695/L134): stars.dat table1.dat>

Nomenclature: Table 2: [MOF2009] NGC NNNN NNNN N=18.

Simbad objects: 42

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Number of rows : 42
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NAME Fornax H1 Cl* 02 37 02.1 -34 11 00     16.59     ~ 107 0
4 NAME Fornax H3 GlC 02 39 48.16 -34 15 28.6   13.59       ~ 131 0
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
6 H88 11 Cl* 04 52 20 -68 59.5           ~ 17 0
7 OGLE LMC-LPV-9759 LP* 04 58 59.8579919424 -67 45 05.257942920     16.800 15.78 15.124 ~ 6 0
8 OGLE LMC-LPV-9787 RG* 04 59 01.3594392360 -67 44 07.283847624     16.790   15.462 ~ 4 0
9 OGLE LMC-LPV-9801 LP* 04 59 02.1507131856 -67 44 35.822492160       15.42 14.829 ~ 7 0
10 OGLE LMC-LPV-9817 RG* 04 59 03.3501156864 -67 45 16.714052424     16.489   15.026 ~ 5 0
11 [MOF2009] NGC 1786 1248 RG* 04 59 04.52 -67 44 27.1           ~ 2 0
12 NGC 1786 Cl* 04 59 07.470 -67 44 45.44   10.1       ~ 152 0
13 OGLE LMC-LPV-9891 RG* 04 59 09.1140833112 -67 43 42.718299924     16.726   15.360 ~ 4 0
14 OGLE LMC-LPV-10010 LP* 04 59 17.1955232184 -67 44 19.517463024     16.486 15.56 15.035 ~ 5 0
15 NGC 1898 As* 05 16 45.380 -69 39 16.76   12.62 11.86     ~ 104 0
16 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
17 NGC 2005 Cl* 05 30 08.500 -69 45 14.42   12.30 11.57     ~ 103 0
18 NGC 2019 Cl* 05 31 56.48 -70 09 32.5   10.9 10.86     ~ 124 0
19 OGLE LMC-LPV-91403 RG* 06 11 25.8149339352 -69 07 36.394900968     16.142 15.89 14.736 ~ 4 0
20 OGLE LMC-LPV-91413 LP* 06 11 30.1628973648 -69 06 49.498768800     16.076   14.669 ~ 5 0
21 NGC 2210 GlC 06 11 31.296 -69 07 17.04   10.9 10.94     ~ 196 0
22 OGLE LMC-RRLYR-24719 RR* 06 11 33.14 -69 06 48.9         19.350 ~ 5 0
23 2MASS J06113663-6906466 RG* 06 11 36.6303281808 -69 06 46.725891156           ~ 3 0
24 Cl* NGC 2210 ABW 7 RG* 06 11 45.3460178976 -69 06 44.256301776   17.47 16.32 15.99   ~ 4 0
25 2MASS J06295653-6419027 RG* 06 29 56.5301279544 -64 19 02.756882352           ~ 2 0
26 2MASS J06300777-6418465 RG* 06 30 07.77 -64 18 46.5           ~ 3 0
27 NGC 2257 Cl* 06 30 12.62 -64 19 40.0   13.24 12.62     ~ 228 0
28 Cl* NGC 2257 W 81 * 06 30 14.1869701752 -64 20 22.178393628           ~ 4 0
29 Cl* NGC 2257 GCS 13 * 06 30 14.78 -64 18 57.6           ~ 3 0
30 Cl* NGC 2257 W 223 * 06 30 17.7983349960 -64 19 47.775906588           ~ 4 0
31 Cl* NGC 2257 W 293 * 06 30 19.7695676904 -64 19 34.637405664           ~ 4 0
32 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
33 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
34 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
35 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
36 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
37 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
38 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
39 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
40 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
41 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
42 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

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