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Sodium abundances of AGB and RGB stars in Galactic globular clusters II. Analysis and results of NGC 104, NGC 6121 and NGC 6809
We analyzed the high-resolution spectra of a large sample of AGB and RGB stars in the Galactic globular clusters (GCs) NGC 104, NGC 6121, and NGC 6809 obtained with FLAMES/GIRAFFE at ESO/VLT, and
Sodium abundances of AGB and RGB stars in Galactic globular clusters - I. Analysis and results of NGC 2808
Context. Galactic globular clusters (GC) are known to have multiple stellar populations and be characterised by similar chemical features, e.g. O−Na anti-correlation. While second-population stars,
The Lithium Content of the Galactic Halo Stars
Thanks to the accurate determination of the baryon density of the universe by the recent cosmic microwave background experiments, updated predictions of the standard model of Big Bang nucleosynthesis
The Lithium Flash - Thermal instabilities generated by lithium burning in RGB stars
We present a scenario to explain the lithium-rich phase which occurs on the red giant branch at the so-called bump in the luminosity function. The high transport coefficients required to enhance the
Revisiting nucleosynthesis in globular clusters: the case of NGC 2808 and the role of He and K
Context. Motivated by recent reports concerning the observation of limited enrichment in He but excess K in stars of globular clusters, we revisit the H-burning conditions that lead to the chemical
Multiple stellar populations and their evolution in globular clusters: A nucleosynthesis perspective
This paper presents a review of the characteristics of the multiple stellar populations observed in globular clusters, and of their possible origin. The current theoretical issues and the many open
Hydrodynamical stellar models including rotation, internal gravity waves and atomic diffusion. I. Formalism and tests on Pop I dwarfs
In this paper, we develop a formalism in order to incorporate the contribution of internal gravity waves to the transport of angular momentum and chemicals over long time-scales in stars. We show
Impact of internal gravity waves on the rotation profile inside pre-main sequence low-mass stars
Aims. We study the impact of internal gravity waves (IGW), meridio nal circulation, shear turbulence, and stellar contractio n on the internal rotation profile and surface velocity evolution of s lar
Yields from Low- and Intermediate-Mass Stars
Stellar nucleosynthesis is the corner-stone of many astrophysical problems. Its understanding, which can be tested by countless observations, leads to insights into the stellar structure and
New clues on non standard mixing on the RGB
We discuss the observational evidences for the non-standard mixing that occurs in low mass stars while they are ascending the Red Giant Branch.