Výsledky vyhledávání - "RICHER, JACQUES"

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Chemical composition of intermediate mass stars members of the M6 (NGC 6405) open cluster

Autor: Kılıçoğlu, Tolgahan, Monier, Richard, Richer, Jacques, Fossati, Luca, Albayrak, Berahitdin

Publikováno v: The Astronomical Journal, 151:49 (30pp), 2016 March

We present here the first abundance analysis of 44 late B, A and F-type members of the young open cluster M6 (NGC 6405, age about 75 Myrs). Spectra, covering the 4500 to 5800 \AA{} wavelength range, were obtained using the FLAMES/GIRAFFE spectrograph

Externí odkaz: http://arxiv.org/abs/1510.05385

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Population II stars and the Spite plateau; Stellar evolution models with mass loss

Autor: Vick, Mathieu, Michaud, Georges, Richer, Jacques, Richard, Olivier

We aim to determine the constraints that observed chemical abundances put on the potential role of mass loss in metal poor dwarfs. Self-consistent stellar evolutionary models that include all the effects of atomic diffusion and radiative acceleration

Externí odkaz: http://arxiv.org/abs/1304.0815

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Stellar Models with Enhanced Abundances of C, N, O, Ne, Na, Mg, Si, S, Ca, and Ti, in Turn, at Constant Helium and Iron Abundances

Autor: VandenBerg, Don A., Bergbusch, Peter A., Dotter, Aaron, Ferguson, Jason W., Michaud, Georges, Richer, Jacques, Proffitt, Charles

Recent work has shown that most globular clusters have at least two chemically distinct components, as well as cluster-to-cluster differences in the mean [O/Fe], [Mg/Fe], and [Si/Fe] ratios at similar [Fe/H] values. In order to investigate the implic

Externí odkaz: http://arxiv.org/abs/1206.1820

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AmFm and lithium gap stars: Stellar evolution models with mass loss

Autor: Vick, Mathieu, Michaud, Georges, Richer, Jacques, Richard, Olivier

A thorough study of the effects of mass loss on internal and surface abundances of A and F stars is carried out in order to constrain mass loss rates for these stars, as well as further elucidate some of the processes which compete with atomic diffus

Externí odkaz: http://arxiv.org/abs/1006.5711

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Implications of WMAP observations on Li abundance and stellar evolution models

Autor: Richard, Olivier, Michaud, Georges, Richer, Jacques

Publikováno v: Astrophys.J. 619 (2005) 538-548

The WMAP determination of the baryon-to-photon ratio implies, through Big Bang nucleosynthesis, a cosmological Li abundance larger, by a factor of 2 to 3, than the Li abundance plateau observed in the oldest Pop II stars. It is however inescapable th

Externí odkaz: http://arxiv.org/abs/astro-ph/0409672

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