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Context. Extremely metal-poor (EMP) stars provide us with indirect information on the first generations of massive stars. The TOPoS survey has been designed to increase the census of these stars and to provide a chemical inventory that is as detailed as possible. Aims. Seven of the most iron-poor...


Bonifacio, P.Caffau, E.Spite, M.Spite, F.Sbordone, L.Monaco, L.François, P.Plez, B.Molaro, P.Gallagher, A.J.Cayrel, R.Christlieb, N.Klessen, R.S.Koch, A.Ludwig, H.-G.Steffen, M.Zaggia, S.Abate, C.[TOPoS: IV. Chemical abundances from high-resolution observations of seven extremely metal-poor stars]TOPoS: IV. Chemical abundances from high-resolution observations of seven extremely metal-poor stars

Context. Globular clusters are known to host multiple stellar populations, which are a signature of their formation process. The globular cluster E3 is one of the few low-mass globulars that is thought not to host multiple populations. Aims. We investigate red giant branch stars in E3 with the ai...


Monaco, L.Villanova, S.Carraro, G.Mucciarelli, A.Moni Bidin, C.[Chemical abundance analysis of red giant branch stars in the globular cluster E3]Chemical abundance analysis of red giant branch stars in the globular cluster E3

Sagittarius (Sgr) is a massive disrupted dwarf spheroidal galaxy in the Milky Way halo that has undergone several stripping events. Previous chemical studies were restricted mainly to a few, metal-rich ([Fe/H] ) stars that suggested a top-light initial mass function (IMF). Here we present the fir...


Hansen, C.J.El-Souri, M.Monaco, L.Villanova, S.Bonifacio, P.Caffau, E.Sbordone, L.[Ages and Heavy Element Abundances from Very Metal-poor Stars in the Sagittarius Dwarf Galaxy]Ages and Heavy Element Abundances from Very Metal-poor Stars in the Sagittarius Dwarf Galaxy

Context. Low-mass dwarf spheroidal galaxies are key objects for our understanding of the chemical evolution of the pristine Universe and the Local Group of galaxies. Abundance ratios in stars of these objects can be used to better understand their star formation and chemical evolution. Aims. We r...


François, P.Monaco, L.Bonifacio, P.Moni Bidin, C.Geisler, D.[Abundance ratios of red giants in low-mass ultra-faint dwarf spheroidal galaxies]Abundance ratios of red giants in low-mass ultra-faint dwarf spheroidal galaxies

Smiljanic, R.Franciosini, E.Randich, S.Magrini, L.Bragaglia, A.Pasquini, L.Vallenari, A.Tautvaišienė, G.Biazzo, K.Frasca, A.Donati, P.Delgado Mena, E.Casey, A. R.Geisler, D.Villanova, S.Tang, B.Sousa, S. G.Gilmore, G.Bensby, T.François, P.Koposov, S. E.Lanzafame, A. C.Pancino, E.Recio-Blanco, A.Costado, M. T.Hourihane, A.Lardo, C.de Laverny, P.Lewis, J.Monaco, L.Morbidelli, L.Sacco, G. G.Worley, C. C.Zaggia, S.Martell, S.[The Gaia-ESO Survey: Inhibited extra mixing in two giants of the open cluster Trumpler 20?]The Gaia-ESO Survey: Inhibited extra mixing in two giants of the open cluster Trumpler 20?

We present the abundance analysis for a sample of 18 red giant branch stars in the metal-poor globular cluster NGC 4147 based on medium- and high-resolution spectra. This is the first extensive spectroscopic study of this cluster. We derive abundances of C, N, O, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, N...


Villanova, S.Monaco, L.Moni Bidin, C.Assmann, P.[A spectroscopic study of the globular Cluster NGC 4147]A spectroscopic study of the globular Cluster NGC 4147

Rojas-Arriagada, A.Recio-Blanco, A.de Laverny, P.Schultheis, M.Guiglion, G.Mikolaitis, Š.Kordopatis, G.Hill, V.Gilmore, G.Randich, S.Alfaro, E. J.Bensby, T.Koposov, S. E.Costado, M. T.Franciosini, E.Hourihane, A.Jofré, P.Lardo, C.Lewis, J.Lind, K.Magrini, L.Monaco, L.Morbidelli, L.Sacco, G. G.Worley, C. C.Zaggia, S.Chiappini, C.[The Gaia-ESO Survey: Separating disk chemical substructures with cluster models⋆ Evidence of a separate evolution in the metal-poor thin disk]The Gaia-ESO Survey: Separating disk chemical substructures with cluster models⋆ Evidence of a separate evolution in the metal-poor thin disk

Aims. Carbon-enhanced metal-poor (CEMP) stars represent a sizeable fraction of all known metal-poor stars in the Galaxy. Their formation and composition remains a significant topic of investigation within the stellar astrophysics community. Methods. We analysed a sample of low-resolution spectra ...


Caffau, E.Gallagher, A.J.Bonifacio, P.Spite, M.Duffau, S.Spite, F.Monaco, L.Sbordone, L.[Investigation of a sample of carbon-enhanced metal-poor stars observed with FORS and GMOS]Investigation of a sample of carbon-enhanced metal-poor stars observed with FORS and GMOS

We observed six He-clump stars of the intermediate-Age stellar cluster Gaia1 with the MIKE/Magellan spectrograph. A possible extra-galactic origin of this cluster, recently discovered thanks to the first data release of the ESA Gaia mission, has been suggested, based on its orbital parameters. Ab...


Mucciarelli, A.Monaco, L.Bonifacio, P.Saviane, I.[Chemical composition of the stellar cluster Gaia1: No surprise behind Sirius]Chemical composition of the stellar cluster Gaia1: No surprise behind Sirius

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