The metal-poor end of the Spite plateau: gravity sensitivity of the Halpha wings fitting.
Luca Sbordone
(1, 2, 3)
,
Piercarlo Bonifacio
(1, 2, 3)
,
Elisabetta Caffau
(2, 3)
,
Hans-Günter Ludwig
(1, 2, 3)
,
Natalie Behara
(1, 2, 3)
,
J. I. Gonzalez-Hernandez
(1, 2, 3)
,
Matthias Steffen
(4)
,
Roger Cayrel
(2, 3)
,
Bernd Freytag
(5)
,
C. Van'T Veer
(2, 3)
,
Paolo Molaro
(6)
,
Bertrand Plez
(7)
,
Thirupathi Sivarani
(8)
,
Monique Spite
(2, 3)
,
François Spite
(2, 3)
,
Timothy C. Beers
(9)
,
Norbert Christlieb
(4)
,
Patrick François
(2, 3)
,
Vanessa Hill
(2, 3, 10)
1
CIFIST -
Cosmological Impact of the First Stars
2 GEPI - Galaxies, Etoiles, Physique, Instrumentation
3 Physique stellaire et galactique
4 ESO - European Southern Observatory
5 CRAL - Centre de Recherche Astrophysique de Lyon
6 INFN - Istituto Nazionale di Fisica Nucleare, Sezione di Roma La Sapienza
7 UM2 - Université Montpellier 2 - Sciences et Techniques
8 Indian Institute of Astrophysiscs, Bangalore - India
9 Michigan State University
10 Observatoire de la Côte d'Azur
2 GEPI - Galaxies, Etoiles, Physique, Instrumentation
3 Physique stellaire et galactique
4 ESO - European Southern Observatory
5 CRAL - Centre de Recherche Astrophysique de Lyon
6 INFN - Istituto Nazionale di Fisica Nucleare, Sezione di Roma La Sapienza
7 UM2 - Université Montpellier 2 - Sciences et Techniques
8 Indian Institute of Astrophysiscs, Bangalore - India
9 Michigan State University
10 Observatoire de la Côte d'Azur
Elisabetta Caffau
- Fonction : Auteur
- PersonId : 772584
- ORCID : 0000-0001-6011-6134
- IdRef : 14550266X
Patrick François
- Fonction : Auteur
- PersonId : 1294615
- ORCID : 0000-0001-8698-2217
Résumé
We recently presented (Sbordone et al., 2009a) the largest sample to date of lithium abundances in extremely metal-poor (EMP) Halo dwarf and Turn-Off (TO) stars. One of the most crucial aspects in estimating Li abundances is the Teff determination, since the Li I 670.8 nm doublet is highly temperature sensitive. In this short contribution we concentrate on the Teff determination based on Halpha wings fitting, and on its sensitivity to the chosen stellar gravity.