First stars XII. Abundances in extremely metal-poor turnoff stars,and comparison with the giants

@article{Bonifacio2009FirstSX,
  title={First stars XII. Abundances in extremely metal-poor turnoff stars,and comparison with the giants},
  author={Piercarlo Bonifacio and Monique Spite and Roger. Cayrel and Vanessa Hill and Franccois Spite and P. François and Bertrand Plez and Hans-G. Ludwig and Elisabetta Caffau and Paolo Molaro and {\'E}ric Depagne and Johannes Andersen and Beatriz Barbuy and Timothy C. Beers and Birgitta Nordstrom and F. Primas Cifist Gepi and Observatoire de Paris INAF- OA Trieste Cassiopee and Observatoire de la Cote d'Azur Graal and Universite de Montpellier Department of PhysicsAstronomy and Uppsala Astronomical Observatory Las Cumbres Observatory T Iag and Universidade de Sao Paulo Department of PhysicsAstronomy and Csce and Jin-a and M. F. Sterzik European Southern Observatory},
  journal={Astronomy and Astrophysics},
  year={2009},
  volume={501},
  pages={519-530}
}
Context. The detailed chemical abundances of extremely metal-poor (EMP) stars are key guides to understanding the early chemical evolution of the Galaxy. Most existing data, however, treat giant stars that may have experienced internal mixing later. Aims. We aim to compare the results for giants with new, accurate abundances for all observable elements in 18 EMP turno. stars. Methods. VLT/UVES spectra at R similar to 45 000 and S/N similar to 130 per pixel (lambda lambda 330-1000 nm) are… 

First stars - XIII. Two extremely metal-poor RR Lyrae stars

Context. The chemical composition of extremely metal-poor stars (EMP stars; [Fe/H] < ∼− 3) is a unique tracer of early nucleosynthesis in the Galaxy. As such stars are rare, we wish to find classes

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Context. Precise S abundances are important in the study of the early chemical evolution of the Galaxy. In particular the site of th e formation remains uncertain because, at low metallicity, the

TOPoS. IV. Chemical abundances from high-resolution observations of seven extremely metal-poor stars

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Extremely metal-poor stars are keys to understand the early evolution of our Galaxy. The ESO large programme TOPoS has been tailored to analyse a new set of metal-poor turn-off stars, whereas most of

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Some insight on the first generation of stars can be obtained from the chemical composition of their direct descendants, extremely metal-poor stars (EMP), with metallicity less than or equal to

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A long sought after goal using chemical abundance patterns derived from metal-poor stars is to understand the Galactic chemical evolution (GCE) and to pin down the nature of the first stars (Pop

CHEMICAL COMPOSITIONS OF KINEMATICALLY SELECTED OUTER HALO STARS

Chemical abundances of 26 metal-poor dwarfs and giants are determined from high-resolution and high signal-to-noise ratio spectra obtained with the Subaru/High Dispersion Spectrograph. The sample is

Explaining the Ba, Y, Sr, and Eu abundance scatter in metal-poor halo stars: constraints to the r-process

Context. Thanks to the heroic observational campaigns carried out in recent years we now have large samples of metal-poor stars for which measurements of detailed abundances exist. [...] These data
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