Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-12-15
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
In press, Light elements in the Universe, Proceedings IAU Symposium No. 268, 2010. C. Charbonnel, M. Tosi, F. Primas & C. Chia
Scientific paper
We present Li abundances for 73 stars in the metallicity range -3.5 < [Fe/H] < -1.0 using improved IRFM temperatures (Casagrande et al. 2010) with precise E(B-V) values obtained mostly from interstellar NaI D lines, and high-quality equivalent widths (errors ~ 3%). At all metallicities we uncover a fine-structure in the Li abundances of Spite plateau stars, which we trace to Li depletion that depends on both metallicity and mass. Models including atomic diffusion and turbulent mixing seem to reproduce the observed Li depletion assuming a primordial Li abundance ALi = 2.64 dex (MARCS models) or 2.72 (Kurucz overshooting models), in good agreement with current predictions (ALi = 2.72) from standard BBN. We are currently expanding our sample to have a better coverage of different evolutionary stages at the high and low metallicity ends, in order to verify our findings.
Asplund Martin
Casagrande Luca
Melendez Jorge
Ramirez Ignacio
Schuster William J.
No associations
LandOfFree
Observational signatures for depletion in the Spite plateau: solving the cosmological Li discrepancy? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Observational signatures for depletion in the Spite plateau: solving the cosmological Li discrepancy?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observational signatures for depletion in the Spite plateau: solving the cosmological Li discrepancy? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-306176