Published August 10, 2009
| Version v1
Conference paper
The metal-poor end of the Spite plateau
Creators
- Sbordone, Luca
- Bonifacio, Piercarlo
- Caffau, Elisabetta
- Ludwig, Hans-Günter
- Behara, Natalie
- Gonzalez-Hernandez, J. I.
- Steffen, Matthias
- Cayrel, Roger
- Freytag, Bernd
- Van'T Veer, C.
- Molaro, Paolo
- Plez, Bertrand
- Sivarani, Thirupathi
- Spite, Monique
- Spite, François
- Beers, Timothy C.
- Christlieb, Norbert
- François, Patrick
- Hill, Vanessa
Contributors
Others:
- Cosmological Impact of the First Stars (CIFIST) ; Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
- Galaxies, Etoiles, Physique, Instrumentation (GEPI) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
- Physique stellaire et galactique ; Galaxies, Etoiles, Physique, Instrumentation (GEPI) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
- European Southern Observatory (ESO)
- Centre de Recherche Astrophysique de Lyon (CRAL) ; École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Istituto Nazionale di Fisica Nucleare, Sezione di Roma La Sapienza (INFN)
- Université Montpellier 2 - Sciences et Techniques (UM2)
- Indian Institute of Astrophysiscs, Bangalore - India
- Michigan State University
- Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)
- Cunha
- Katia; Spite
- Monique; Barbuy
- Beatriz
Description
We present the largest sample available to date of lithium abundances in extremely metal poor (EMP) Halo dwarfs. Four Teff estimators are used, including IRFM and Halpha wings fitting against 3D hydrodynamical synthetic profiles. Lithium abundances are computed by means of 1D and 3D-hydrodynamical NLTE computations. Below [Fe/H]~-3, a strong positive correlation of A(Li) with [Fe/H] appears, not influenced by the choice of the Teff estimator. A linear fit finds a slope of about 0.30 dex in A(Li) per dex in [Fe/H], significant to 2-3 sigma, and consistent within 1 sigma among all the Teff estimators. The scatter in A(Li) increases significantly below [Fe/H]~-3. Above, the plateau lies at = 2.199 ± 0.086. If the primordial A(Li) is the one derived from standard Big Bang Nucleosynthesis (BBN), it appears difficult to envision a single depletion phenomenon producing a thin, metallicity independent plateau above [Fe/H] = -2.8, and a highly scattered, metallicity dependent distribution below.
Abstract
International audienceAdditional details
Identifiers
- URL
- https://hal.archives-ouvertes.fr/hal-03724488
- URN
- urn:oai:HAL:hal-03724488v1