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J/MNRAS/435/3667 Equivalent widths of NGC5694 stars (Mucciarelli+, 2013)
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Beginning of ReadMe :J/MNRAS/435/3667 Equivalent widths of 6 NGC5694 stars (Mucciarelli+, 2013)
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NGC 5694: another foster son of the Galactic halo.
Mucciarelli A., Bellazzini M., Catelan M., Dalessandro E., Amigo P.,
Correnti M., Cortes C., D'Orazi V.
<Mon. Not. R. Astron. Soc., 435, 3667-3680 (2013)>
=2013MNRAS.435.3667M
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ADC_Keywords: Clusters, globular ; Equivalent widths
Keywords: techniques: spectroscopic - stars: abundances -
globular clusters: individual: NGC 5694
Abstract:
We present the results of the analysis of high-resolution spectra
obtained with UVES-FLAMES at the Very Large Telescope for six red
giant branch stars in the outer-halo metal-poor ([Fe/H]I=-1.98 and
[Fe/H]II=-1.83) Galactic globular cluster NGC 5694, which has been
suggested as a possible incomer by Lee et al. based on the anomalous
chemical composition of a single cluster giant. We obtain accurate
abundances for a large number of elements and we find that (a)the six
target stars have the same chemical composition within the
uncertainties, except for Na and Al; (b) the average cluster abundance
of alpha elements (with the only exception of Si) is nearly solar,
at odds with typical halo stars and globular clusters of similar
metallicity; (c) Y, Ba, La and Eu abundances are also significantly
lower than in Galactic field stars and star clusters of similar
metallicity. Hence, we confirm the Lee et al. classification of NGC
5694 as a cluster of extragalactic origin. We provide the first
insight on the Na-O and Mg-Al anticorrelations in this cluster: all
the considered stars have very similar abundance ratios for these
elements, except one that has significantly lower [Na/Fe] and [Al/Fe]
ratios, suggesting that some degree of early self-enrichment has
occurred also in this cluster.
Description:
The data have been acquired with the FLAMES@VLT spectrograph in the
combined MEDUSA+UVES mode, allowing the simultaneous allocation of
eight UVES high-resolution fibres (discussed in this paper) and 132
MEDUSA mid-resolution fibres (discussed in a forthcoming paper, mainly
devoted to the internal kinematics of the cluster). The employed
spectral configuration for the UVES targets discussed in this paper is
the 580 Red Arm, with a spectral resolution of 40000 and covering the
range 4800-6800AA. A total of eight exposures of 46min each for the
same targets configuration has been secured in Service Mode during the
period between 2012 April and July.