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Halo chemistry and first stars. The chemical composition of the matter in the early Galaxy, from C to Mg†

Published online by Cambridge University Press:  01 June 2008

M. Spite ,
P. Bonifacio ,
R. Cayrel ,
F. Spite ,
P. Francois ,
H. G. Ludwig ,
E. Caffau ,
S. Andrievsky ,
B. Barbuy  and
B. Plez
...Show all authors
M. Spite
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: [email protected]
P. Bonifacio
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: [email protected] CIFIST Marie Curie Excellence Team INA - Osservatorio Astronomico di Trieste, Via Tiepolo 11, I-34143 Trieste, Italy
R. Cayrel
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: [email protected]
F. Spite
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: [email protected]
P. Francois
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: [email protected]
H. G. Ludwig
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: [email protected] CIFIST Marie Curie Excellence Team
E. Caffau
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: [email protected]
S. Andrievsky
Affiliation:
Dept of Astronomy, Odessa Nat. University, Shevchenko Park, 65014 Odessa, Ukraine
B. Barbuy
Affiliation:
Univ. de Sao Paulo, Depto. de Astronomia, Rua do Matao 1226, Sao Paulo 05508-900, Brazil
B. Plez
Affiliation:
GRAAL, Univ. de Montpellier II, F-34095 Montpellier Cedex 05, France
P. Molaro
Affiliation:
INA - Osservatorio Astronomico di Trieste, Via Tiepolo 11, I-34143 Trieste, Italy
J. Andersen
Affiliation:
The Niels Bohr Institute, Astronomy group, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
T. Beers
Affiliation:
Michigan State Univ., East Lansing, MI 48824, USA
E. Depagne
Affiliation:
Las Cumbres Observatory, Goleta, CA 93117, USA
B. Nordström
Affiliation:
The Niels Bohr Institute, Astronomy group, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
F. Primas
Affiliation:
ESO, Karl Scwarzschild-Str. 2, D 85749, Garching bei München, Germany
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Abstract

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From NLTE computations of the magnesium abundance in a sample of extremely metal-poor giants we derive [Mg/Fe]=+0.7, leading to [Al/Mg]=−0.80 and [Na/Mg]=−0.85 in the early Galaxy. The ratio [O/Mg] should be near to the solar value. Measurements of nitrogen abundances derived from the analysis of the NH band in eight more stars confirm the large scatter of the ratios [N/Fe] and [N/O] in the early Galaxy.

Keywords

Stars: abundancesstars: atmospheresstars: Populations IIGalaxy:abundancesGalaxy:evolutionnucleosynthesis
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S254: The Galaxy Disk in Cosmological Context , June 2008 , pp. 349 - 354
Copyright
Copyright © International Astronomical Union 2009

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