2012A&A...548A..82M


Query : 2012A&A...548A..82M

2012A&A...548A..82M - Astronomy and Astrophysics, volume 548A, 82-82 (2012/12-1)

Chemical abundances in the old LMC globular cluster Hodge 11.

MATELUNA R., GEISLER D., VILLANOVA S., CARRARO G., GROCHOLSKI A., SARAJEDINI A., COLE A. and SMITH V.

Abstract (from CDS):

The study of globular clusters is one of the most powerful ways to learn about a galaxy's chemical evolution and star formation history. They preserve a record of chemical abundances at the time of their formation and are relatively easy to age date. The most detailed knowledge of the chemistry of a star is given by high resolution spectroscopy, which provides accurate abundances for a wide variety of elements, yielding a wealth of information on the various processes involved in the cluster's chemical evolution. We studied red giant branch (RGB) stars in an old, metal-poor globular cluster of the Large Magellanic Cloud (LMC), Hodge 11 (H11), in order to measure as many elements as possible. The goal is to compare its chemical trends to those in the Milky Way halo and dwarf spheroidal galaxies in order to help understand the formation history of the LMC and our own Galaxy. We have obtained high resolution VLT/FLAMES spectra of eight RGB stars in H11. The spectral range allowed us to measure a variety of elements, including Fe, Mg, Ca, Ti, Si, Na, O, Ni, Cr, Sc, Mn, Co, Zn, Ba, La, Eu and Y. We derived a mean [Fe/H]=-2.00±0.04, in the middle of previous determinations. We found low [α/Fe] abundances for our targets, more comparable to values found in dwarf spheroidal galaxies than in the Galactic halo, suggesting that if H11 is representative of its ancient populations then the LMC does not represent a good halo building block. Our [Ca/Fe] value is about 0.3dex less than that of halo stars used to calibrate the Ca IR triplet technique for deriving metallicity. A hint of a Na abundance spread is observed. Its stars lie at the extreme high O, low Na end of the Na:O anti-correlation displayed by Galactic and LMC globular clusters.

Abstract Copyright:

Journal keyword(s): stars: abundances - Magellanic Clouds - globular clusters: individual: Hodge 11

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6082 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15673 1
3 [GCS2006] Hodge 11 12 RG* 06 14 17.04 -69 50 42.5     16.75   15.54 ~ 2 0
4 [GCS2006] Hodge 11 7 RG* 06 14 21.6979762381 -69 49 56.289225450     16.88   15.70 ~ 2 0
5 [GCS2006] Hodge 11 10 LP* 06 14 21.85 -69 50 32.4     15.86 14.898 14.36 ~ 3 0
6 [GCS2006] Hodge 11 14 RG* 06 14 22.57 -69 51 18.8     17.81   16.69 ~ 2 0
7 NAME Hodge 11 GlC 06 14 22.92 -69 50 54.9   12.57 11.93     ~ 104 0
8 2MASS J06142337-6952382 AB* 06 14 23.3629914947 -69 52 38.443042760     17.98   17.20 ~ 1 0
9 [GCS2006] Hodge 11 8 AB* 06 14 24.80 -69 50 16.6     18.04   17.05 ~ 2 0
10 2MASS J06143036-6949499 RG* 06 14 30.3605961774 -69 49 49.810050569     18.21   17.14 ~ 2 0
11 [GCS2006] Hodge 11 3 RG* 06 14 31.4566128379 -69 49 35.176174579     17.42   16.29 ~ 2 0
12 SA 98- reg 06 52 04.1 -00 23 58           ~ 170 0
13 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2990 0

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2021.12.03-23:10:45

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