2015A&A...579A...6S


Query : 2015A&A...579A...6S

2015A&A...579A...6S - Astronomy and Astrophysics, volume 579A, 6-6 (2015/7-1)

The Gaia-ESO Survey: Detailed abundances in the metal-poor globular cluster NGC 4372.

SAN ROMAN I., MUNOZ C., GEISLER D., VILLANOVA S., KACHAROV N., KOCH A., CARRARO G., TAUTVAISIENE G., VALLENARI A., ALFARO E.J., BENSBY T., FLACCOMIO E., FRANCOIS P., KORN A.J., PANCINO E., RECIO-BLANCO A., SMILJANIC R., BERGEMANN M., COSTADO M.T., DAMIANI F., HEITER U., HOURIHANE A., JOFRE P., LARDO C., DE LAVERNY P., MASSERON T., MORBIDELLI L., SBORDONE L., SOUSA S.G., WORLEY C.C. and ZAGGIA S.

Abstract (from CDS):

We present the abundance analysis for a sample of 7 red giant branch stars in the metal-poor globular cluster NGC 4372 based on UVES spectra acquired as part of the Gaia-ESO Survey. This is the first extensive study of this cluster from high-resolution spectroscopy. We derive abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, Fe, Cr, Ni, Y, Ba, and La. We find a metallicity of [Fe/H]=-2.19±0.03 and find no evidence of any metallicity spread. This metallicity makes NGC 4372 one of the most metal-poor Galactic globular clusters. We also find an α-enhancement typical of halo globular clusters at this metallicity. Significant spreads are observed in the abundances of light elements. In particular, we find a Na-O anticorrelation. Abundances of O are relatively high compared with other globular clusters. This could indicate that NGC 4372 was formed in an environment with high O for its metallicity. A Mg-Al spread is also present that spans a range of more than 0.5dex in Al abundances. Na is correlated with Al and Mg abundances at a lower significance level. This pattern suggests that the Mg-Al burning cycle is active. This behavior can also be seen in giant stars of other massive, metal-poor clusters. A relation between light and heavy s-process elements has been identified.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: NGC 4372 - stars: abundances

CDS comments: Tables 1,2 objects are 2MASS objects in SIMBAD.

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1362 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16525 1
3 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 896 0
4 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1364 0
5 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 796 0
6 2MASS J12250638-7243066 * 12 25 06.3867092352 -72 43 06.720479544   14.70 13.22   11.52 ~ 2 0
7 2MASS J12250662-7239222 * 12 25 06.6096753864 -72 39 22.361437008   15.12 13.84   12.01 ~ 4 0
8 [KBK2014] N2779 * 12 25 34.1836811928 -72 35 25.149039828   14.64 13.21   11.57 ~ 2 0
9 2MASS J12253881-7245095 * 12 25 38.8116435624 -72 45 09.578945268   15.79 14.13   12.97 ~ 4 0
10 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 288 0
11 2MASS J12260765-7236513 * 12 26 07.6496801472 -72 36 51.402748824   14.66 13.12   11.25 ~ 4 0
12 2MASS J12264294-7241574 * 12 26 42.9354144024 -72 41 57.619966344   14.98 13.77   12.25 ~ 4 0
13 2MASS J12264876-7239411 * 12 26 48.7524500784 -72 39 41.345879292   15.10 13.84   11.99 ~ 4 0
14 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 250 0
15 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 352 0
16 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 952 0
17 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3300 0
18 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1291 0
19 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1273 1
20 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 875 1
21 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 788 1
22 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 846 0
23 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1320 0
24 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 2038 2
25 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1018 0
26 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 1927 0
27 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 407 0
28 NGC 6791 OpC 19 20 53 +37 46.7   10.52 9.5     ~ 987 0
29 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 301 0
30 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 349 0
31 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3062 0
32 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 984 1
33 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 999 0
34 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 500 0

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2023.02.04-10:44:35

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