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41 papers
Detailed analysis of a sample of field metal-poor N-rich dwarfs
M Spite, F Spite, E Caffau +2
Aims. The aim of this work is to compare the detailed chemical composition of the field N-rich dwarf stars to the second generation stars of globular clusters (GC) in order to inve…
Be, V and Cu in the halo star CS 31082-001 from near-UV spectroscopy
H. Ernandes, B. Barbuy, A. Friaça +5
The 'First Stars' programme revealed the metal-poor halo star CS 31082-001 to be r-process and actinide rich, including the first measurement of a uranium abundance for an old star…
12C/13C ratio and CNO abundances in the classical very old metal-poor dwarf HD 140283
M. Spite, F. Spite, B. Barbuy
The isotope abundances provide powerful diagnostics of the chemical enrichment in our Galaxy. The star HD 140283 is one of the best-studied very metal-poor dwarf stars. It is very…
TOPoS VI. The metal-weak tail of the metallicity distribution functions of the Milky Way and of the Gaia-Sausage-Enceladus structure
P Bonifacio, L Monaco, S Salvadori +11
Context. The TOPoS project has the goal to find and analyse Turn-Off (TO) stars of extremely low metallicity. To select the targets for spectroscopic follow-up at high spectral res…
Reviving old controversies: is the early Galaxy flat or round? Investigations into the early phases of the Milky Way formation through stellar kinematics and chemical abundances
P. Di Matteo, M. Spite, M. Haywood +4
We analyse a set of very metal-poor stars for which accurate chemical abundances have been obtained as part of the ESO Large Program "First stars" in the light of the Gaia DR2 data…
Be and O in the ultra metal-poor dwarf 2MASS J18082002-5104378: The Be-O correlation
M. Spite, P. Bonifacio, F. Spite +3
Measurable amounts of Be could have been synthesised primordially if the Universe were non-homogeneous or in the presence of late decaying relic particles. We investigate the Be ab…