CS 22876-032: The Most Metal-Poor Dwarfs. Abundances and 3D Effects
J. I. González Hernández
(1, 2, 3, 4)
,
Piercarlo Bonifacio
(4, 1, 2, 3, 5)
,
Hans-Günter Ludwig
(1, 2, 3, 4)
,
Elisabetta Caffau
(1, 2, 3)
,
Monique Spite
(1, 2, 3)
,
François Spite
(1, 2, 3)
,
Roger Cayrel
(1, 2, 3)
,
Paolo Molaro
(1, 2, 3, 6)
,
Vanessa Hill
(1, 2, 3)
,
Patrick François
(1, 2, 3)
,
Bertrand Plez
(7)
,
Timothy C. Beers
(8)
,
Thirupathi Sivarani
(8)
,
Johannes Andersen
(9)
,
Beatriz Barbuy
(10)
,
Éric Depagne
(11)
,
Birgitta Nordström
(9)
,
Francesca Primas
(12)
1
GEPI -
Galaxies, Etoiles, Physique, Instrumentation
2 Physique stellaire et galactique
3 Observatoire de Paris
4 CIFIST - Cosmological Impact of the First Stars
5 Istituto Nazionale di Astrofisica-Observatorio Astronomico di Trieste, Italy
6 INAF-OATs - INAF-Osservatorio Astronomico di Trieste
7 GRAAL - Groupe de Recherches Autrichiennes et Allemandes. UHB
8 Department of Physics and Astronomy, Center for the Study of Cosmic Evolution (CSCE) and Joint Institute for Nuclear Astrophysics (JINA), Michigan State University, E. Lansing
9 Niels Bohr Institute, Department of Astrophysics
10 Universidade de Sao Paulo, Departamento de Astronomia, Rua do Matao 1226, 05508-900 Sao Paulo, Brazil
11 Las Cumbres Observatory, Goleta
12 ESO - European Southern Observatory
2 Physique stellaire et galactique
3 Observatoire de Paris
4 CIFIST - Cosmological Impact of the First Stars
5 Istituto Nazionale di Astrofisica-Observatorio Astronomico di Trieste, Italy
6 INAF-OATs - INAF-Osservatorio Astronomico di Trieste
7 GRAAL - Groupe de Recherches Autrichiennes et Allemandes. UHB
8 Department of Physics and Astronomy, Center for the Study of Cosmic Evolution (CSCE) and Joint Institute for Nuclear Astrophysics (JINA), Michigan State University, E. Lansing
9 Niels Bohr Institute, Department of Astrophysics
10 Universidade de Sao Paulo, Departamento de Astronomia, Rua do Matao 1226, 05508-900 Sao Paulo, Brazil
11 Las Cumbres Observatory, Goleta
12 ESO - European Southern Observatory
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
Unevolved extremely metal-poor stars offer us a unique tool to infer knowledge of the first generation of stars. We have analysed UVES high-resolution spectra of the double-lined spectroscopic binary CS 22876-032 which comprises the two most metal-poor dwarfs currently known. In particular, we determine the oxygen (from OH lines in the near-UV) and lithium abundances taking into account 3D effects.