Astron. J., 136, 375-388 (2008/July-0)
The chemical composition of red giant stars in four intermediate-age clusters of the Large Magellanic Cloud.
MUCCIARELLI A., CARRETTA E., ORIGLIA L. and FERRARO F.R.
Abstract (from CDS):
This paper presents the chemical abundance analysis of a sample of 27 red giant stars located in four populous intermediate-age globular clusters in the Large Magellanic Cloud, namely NGC 1651, 1783, 1978, and 2173. This analysis is based on high-resolution (R∼ 47,000) spectra obtained with the UVES@VLT spectrograph. For each cluster we derived up to 20 abundance ratios sampling the main chemical elemental groups, namely light odd-Z, α, iron-peak, and neutron-capture elements. All the analyzed abundance patterns behave similarly in the four clusters and also show negligible star-to-star scatter within each cluster. We find [Fe/H] = -0.30±0.03, -0.35±0.02, -0.38±0.02, and -0.51±0.03 dex for NGC 1651, 1783, 1978, and 2173, respectively. The measurement of light odd-Z nuclei gives slightly subsolar [Na/Fe] and a more significant [Al/Fe] depletion (~-0.50 dex). The [α/Fe] abundance ratios are nearly solar, while the iron-peak elements well trace those of the iron. S-process elements behave in a peculiar way: light s-elements give subsolar [Y/Fe] and [Zr/Fe] abundance ratios, while heavy s-elements give enhanced [Ba/Fe], [La/Fe], and [Nd/Fe] with respect to the solar values. Also, the [Eu/Fe] abundance ratio turns out to be enhanced (∼0.4 dex).
globular clusters: general - Magellanic Clouds - stars: abundances - techniques: spectroscopic
VizieR on-line data:
<Available at CDS (J/AJ/136/375): table1.dat table2.dat table4.dat tab5-9.dat>
[MCO2008] NGC 1651 NNN (Nos 1-678). [MCO2008] NGC 1783 NNNN (Nos 1-1904). [MCO2008] NGC 1978 NNNN (Nos 1-2682). [MCO2008] NGC 2173 NNN (Nos 1-680).
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