International audienceThe detailed abundance patterns in extremely metal-poor (EMP) stars are examined, using the results of the First Stars ESO-VLT Large Program on large samples of dwarfs (located close to the main sequence turnoff) and giant stars (Cayrel et al. 2004; Bonifacio et al. 2007 and subsequent papers). Abundances measured in giants are compared to those measured in turnoff stars, and to comparable quality data in the literature, to demonstrate that the systematics involved in most abundance ratios are very small. A few exceptions are discussed: a reanalysis of Na and Al in EMP samples is performed using NLTE computations. In addition, giants with luminosities brighter than the RGB bump are shown to exhibit the sign of surface ...
In the framework of the ESO Large Programme “First Stars”, very high-quality spectra of some 70 very...
We use a large set of high S/N, high resolution spectra of 19 stars with -2.8 <[Fe/H]< 0 to study th...
International audienceThe abundance patterns of the neutron-capture elements in metal-poor stars pro...
International audienceThe detailed abundance patterns in extremely metal-poor (EMP) stars are examin...
Context. The detailed chemical abundances of extremely metal-poor (EMP) stars are key guides to unde...
Context. The chemical composition of extremely metal-poor stars (EMP stars; [Fe/H] < similar to -3) ...
International audienceWe have investigated the poorly-understood origin of nitrogen in the early Gal...
Context. Extremely metal-poor (EMP) stars preserve a fossil record of the composition of the ISM whe...
29 pages, 15 figures, 11 tablesIn the framework of an ESO Large Programme high quality spectra of 70...
Context.Extremely metal-poor (EMP) stars preserve a fossil record of the composition of the ISM when...
Context. The old Galactic halo stars hold the fossil record of the interstellar medium chemical comp...
International audienceContext: .Extremely metal-poor (EMP) stars preserve a fossil record of the com...
In the framework of the ESO Large Programme “First Stars”, very high-quality spectra of some 70 very...
We use a large set of high S/N, high resolution spectra of 19 stars with -2.8 <[Fe/H]< 0 to study th...
International audienceThe abundance patterns of the neutron-capture elements in metal-poor stars pro...
International audienceThe detailed abundance patterns in extremely metal-poor (EMP) stars are examin...
Context. The detailed chemical abundances of extremely metal-poor (EMP) stars are key guides to unde...
Context. The chemical composition of extremely metal-poor stars (EMP stars; [Fe/H] < similar to -3) ...
International audienceWe have investigated the poorly-understood origin of nitrogen in the early Gal...
Context. Extremely metal-poor (EMP) stars preserve a fossil record of the composition of the ISM whe...
29 pages, 15 figures, 11 tablesIn the framework of an ESO Large Programme high quality spectra of 70...
Context.Extremely metal-poor (EMP) stars preserve a fossil record of the composition of the ISM when...
Context. The old Galactic halo stars hold the fossil record of the interstellar medium chemical comp...
International audienceContext: .Extremely metal-poor (EMP) stars preserve a fossil record of the com...
In the framework of the ESO Large Programme “First Stars”, very high-quality spectra of some 70 very...
We use a large set of high S/N, high resolution spectra of 19 stars with -2.8 <[Fe/H]< 0 to study th...
International audienceThe abundance patterns of the neutron-capture elements in metal-poor stars pro...