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The solar photospheric abundance of zirconium
Elisabetta Caffau, Rosanna Faraggiana, Hans-Günter Ludwig +2
Zirconium (Zr), together with strontium and yttrium, is an important element in the understanding of the Galactic nucleosynthesis. In fact, the triad Sr-Y-Zr constitutes the first…
Is Palomar 1 really associated with the Canis Major overdensity?
Ivo Saviane, Lorenzo Monaco, Matteo Correnti +2
It has recently been suggested that the peculiar cluster Pal 1 is associated to the Canis Major dwarf galaxy, which existence is still at the center of a debate. Our first measurem…
Li - O anti-correlation in NGC 6752: evidence for Li-enriched polluting gas
Z. -X. Shen, P. Bonifacio, L. Pasquini +1
Elemental correlations and anti-correlations are known to be present in globular clusters (GCs) owing to pollution by CNO cycled gas. Because of its fragility Li is destroyed at th…
GYES, a multifibre spectrograph for the CFHT
P. Bonifacio, S. Mignot, J. -L. Dournaux +38
We have chosen the name of GYES, one of the mythological giants with one hundred arms, offspring of Gaia and Uranus, for our instrument study of a multifibre spectrograph for the p…
Cu I resonance lines in turn-off stars of NGC 6752 and NGC 6397. Effects of granulation from CO5BOLD models
Piercarlo Bonifacio, Elisabetta Caffau, Hans-Günter Ludwig
Context. Copper is an element whose interesting evolution with metallicity is not fully understood. Observations of copper abundances rely on a very limited number of lines, the st…
Local stars formed at z>10: a sample extracted from the SDSS
Luca Sbordone, Piercarlo Bonifacio, Elisabetta Caffau +1
As the Universe emerged from its initial hot and dense phase, its chemical composition was extremely simple, being limited to stable H and He isotopes, and traces of Li. The first…