NGC 5694: another foster son of the Galactic Halo
  We present the results of the analysis of high-resolution spectra obtained
with UVES-FLAMES@VLT 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. (2006) 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 extra-galactic origin. We provide the first insight
on the Na-O and Mg-Al anti-correlations 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.
