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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: monique.spite@obspm.fr
P. Bonifacio
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: monique.spite@obspm.fr 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: monique.spite@obspm.fr
F. Spite
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: monique.spite@obspm.fr
P. Francois
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: monique.spite@obspm.fr
H. G. Ludwig
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: monique.spite@obspm.fr CIFIST Marie Curie Excellence Team
E. Caffau
Affiliation:
GEPI - Observatoire de Paris-Meudon F92195 Meudon Cedex, France email: monique.spite@obspm.fr
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

References

Andrievsky, S. M., Spite, M., Korotin, S. A., Spite, F., Bonifacio, P., Cayrel, R., Hill, V., & François, P., 2007, A&A 464, 1081Google Scholar
Andrievsky, S. M., Spite, M., Korotin, S. A., Spite, F., Bonifacio, P., Cayrel, R., Hill, V., & François, P., 2008, A&A 481, 481Google Scholar
Barklem, P. S., Christlieb, N., Beers, T. C., Hill, V., Bessell, M. S., Holmberg, J., Marsteller, B., Rossi, S., Zickgraf, F.-J., & Reimers, D., 2005, A&A 439, 129Google Scholar
Beers, T. C., Preston, G. W., & Schectman, S. A., 1992, AJ 103, 1987CrossRefGoogle Scholar
Bonifacio, P., Molaro, P., Sivarani, T., Cayrel, R., Spite, M., Spite, F., Plez, B., Andersen, J., Barbuy, B., Beers, T. C., Depagne, E., Hill, V., François, P., Nordström, B., & Primas, F., 2007, A&A 462, 851, (“First Stars VII”)Google Scholar
Bonifacio, P., Spite, M., Cayrel, R., Hill, V., Spite, F., François, P., Plez, B., Ludwig, H-G., Caffau, E., Molaro, P., Depagne, E., Andersen, J., Barbuy, B., Beers, T. C., Nordström, B., & Primas, F., 2004, A&A submitted, (“First Stars XII”)Google Scholar
Cayrel, R., Depagne, E., Spite, M., Hill, V., Spite, F., François, P., Plez, B., Beers, T. C., Primas, F., Andersen, J., Barbuy, B., Bonifacio, P., Molaro, P., & Nordström, B., 2004, A&A 416, 1117, (“First Stars V”)Google Scholar
Centurion, M., Molaro, P., Vladilo, G., Péroux, C., Levshakov, S. A., & D'Odorico, V., 2003, A&A 403, 55Google Scholar
Denissenkov, P. A. & Pinsonneault, M., 2008, ApJ 679, 1541CrossRefGoogle Scholar
Gehren, T., Liang, Y. C., Shi, J. R., Zhang, H. W., & Zhao, G., 2004, A&A 413, 1045Google Scholar
Gehren, T., Shi, J. R., Zhang, H. W., Zhao, G., & Korn, A. J., 2006, A&A 451, 1065Google Scholar
Gustafsson, B., Edvardsson, B., Eriksson, K., Jørgensen, U. G., Nordlund, A., & Plez, B., 2008, arXiv0805.0554v1Google Scholar
Meynet, G., Ekstrom, S., Georgy, C., Maeder, A., & Hirschi, R., 2008, arXiv0806.4063MGoogle Scholar
Pettini, M., Zych, B. J., Steidel, C. C., & Chaffee, F. H. 2008 Mont. Not. R., Astron. Soc. 385, 2011CrossRefGoogle Scholar
Spite, M., Cayrel, R., Plez, B., Hill, V., Spite, F., & Depagne, E., François, P.Bonifacio, P.Barbuy, B.Beers, T.Andersen, J.Molaro, P., Nordström, B., Primas, F., 2005, A&A 430, 655, (“First Stars VI”)Google Scholar
Spite, M., Cayrel, R., Hill, V., Spite, F., François, P., Plez, B., Bonifacio, P., Molaro, P., Depagne, E., Andersen, J., Barbuy, B., Beers, T. C., Nordström, B., & Primas, F., 2006, A&A 455, 291, (“First Stars IX”)Google Scholar