R
R. Cayrel
Researcher at Centre national de la recherche scientifique
Publications - 25
Citations - 3130
R. Cayrel is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Stars & Metallicity. The author has an hindex of 19, co-authored 25 publications receiving 2938 citations. Previous affiliations of R. Cayrel include Paris Diderot University & Paris Observatory.
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Journal ArticleDOI
First stars V - abundance patterns from C to Zn and supernova yields in the early galaxy
R. Cayrel,E. Depagne,M. Spite,Vanessa Hill,F. Spite,P. Francois,Bertrand Plez,Timothy C. Beers,Francesca Primas,Johannes Andersen,Beatriz Barbuy,Piercarlo Bonifacio,Paolo Molaro,Birgitta Nordström +13 more
TL;DR: In this paper, the abundance analysis of an homogeneous sample of 35 giants selected from the HK survey of Beers et al. was presented, emphasizing stars of extremely low metallicity: 30 of the 35 stars are in the range −4.1 < (Fe/H) < −2.7, and 22 stars have (Fe /H) ≥ −3.0.
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The extreme r-element rich, iron-poor halo giant CS31082-001: Implications for the r-process site(s) and radioactive cosmochronology
Vanessa Hill,Bertrand Plez,R. Cayrel,Timothy C. Beers,Birgitta Nordström,Johannes Andersen,M. Spite,F. Spite,Beatriz Barbuy,Piercarlo Bonifacio,E. Depagne,P. Francois,Francesca Primas +12 more
TL;DR: In this article, a high-resolution spectroscopic analysis of the bright (V=11.7), extreme halo giant CS31082-001 ([Fe/H] = -2.9), obtained in an ESO-VLT Large Programme dedicated to very metal-poor stars, is presented.
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First Stars. II. Elemental abundances in the extremely metal-poor star CS 22949--037. A diagnostic of early massive supernovae
E. Depagne,Vanessa Hill,M. Spite,F. Spite,Bertrand Plez,Timothy C. Beers,Beatriz Barbuy,R. Cayrel,Johannes Andersen,Piercarlo Bonifacio,P. Francois,Birgitta Nordström,Francesca Primas +12 more
TL;DR: In this paper, the VLT-UVES spectra of CS 22949-037 have been used to determine abundances for 21 elements in this star over a wide range of atomic mass.
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NLTE determination of the aluminium abundance in a homogeneous sample of extremely metal-poor stars
S. M. Andrievsky,S. M. Andrievsky,M. Spite,S. A. Korotin,François Spite,Piercarlo Bonifacio,R. Cayrel,Vanessa Hill,P. Francois +8 more
TL;DR: In this paper, the NLTE profiles of the blue resonance aluminium lines have been computed in a sample of 53 extremely metal-poor stars with a modified version of the program MULTI applied to an atomic model of the Al atom with 78 levels of Al I and 13 levels of AL II, and compared to the observations.
Journal ArticleDOI
NLTE determination of the sodium abundance in a homogeneous sample of extremely metal-poor stars
S. M. Andrievsky,M. Spite,S. A. Korotin,François Spite,P. Bonifacio,R. Cayrel,Vanessa Hill,P. Francois +7 more
TL;DR: In this article, the spectrum profiles of two resonant sodium D lines are computed in a sample of 54 extremely metal-poor (EMP) stars and turn-off stars (33 of them with [Fe/H]< -3.0) with a modified version of the code MULTI, and compared to the observed spectra.