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| DOI | 10.1051/0004-6361/200913413 | ||||
| Año | 2010 | ||||
| Tipo | corrección |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
For the first time we show the detailed, late-stage, chemical evolution history of a small nearby dwarf spheroidal galaxy in the Local Group. We present the results of a high-resolution (R ∼ 20 000, λ = 5340-5620; 6120-6701) FLAMES/GIRAFFE abundance study at ESO/VLT of 81 photometrically selected, red giant branch stars in the central 25 of the Fornax dwarf spheroidal galaxy. We also carried out a detailed comparison of the effects of recent developments in abundance analysis (e.g., spherical models vs. plane-parallel) and the automation that is required to efficiently deal with such large data sets. We present abundances of α-elements (Mg, Si, Ca, and Ti), iron-peak elements (Fe, Ni, and Cr), and heavy elements (Y, Ba, La, Nd, and Eu). Our sample was randomly selected and is clearly dominated by the younger and more metal-rich component of Fornax, which represents the major fraction of stars in the central region. This means that the majority of our stars are 1−4 Gyr old, and thus represent the end phase of chemical evolution in this system. Our sample of stars has unusually low [α/Fe], [Ni/Fe], and [Na/Fe] compared to the Milky Way stellar populations at the same [Fe/H]. The particularly important role of stellar winds from low-metallicity AGB stars in the creation of s-process elements is clearly seen from the high [Ba/Y]. Furthermore, we present evidence of an s-processorigin of Eu.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Letarte, B. | Hombre |
Univ Groningen - Países Bajos
CALTECH - Estados Unidos South African Astron Observ - República de Sudáfrica University of Groningen, Kapteyn Astronomical Institute - Países Bajos California Institute of Technology - Estados Unidos South African Astronomical Observatory - República de Sudáfrica Kapteyn Instituut - Países Bajos |
| 2 | Hill, V. | Mujer |
Univ Paris Diderot - Francia
Univ Nice Sophia Antipolis - Francia GEPI - Galaxies, Etoiles, Physique, Instrumentation - Francia Observatoire de la Côte d'Azur - Francia |
| 3 | Tolstoy, Eline | Mujer |
Univ Groningen - Países Bajos
University of Groningen, Kapteyn Astronomical Institute - Países Bajos Kapteyn Instituut - Países Bajos |
| 4 | Jablonka, Pascale | Mujer |
Univ Paris Diderot - Francia
Univ Geneva - Suiza GEPI - Galaxies, Etoiles, Physique, Instrumentation - Francia Université de Genève - Suiza Faculty of Science - Suiza |
| 5 | Shetrone, M. | Hombre |
Univ Texas Ft Davis - Estados Unidos
University of Texas System - Estados Unidos |
| 6 | Venn, K. | Mujer |
Univ Victoria - Canadá
University of Victoria - Canadá |
| 7 | Spite, Monique | Mujer |
Univ Paris Diderot - Francia
GEPI - Galaxies, Etoiles, Physique, Instrumentation - Francia |
| 8 | Irwin, Mike | Hombre |
UNIV CAMBRIDGE - Reino Unido
Institute of Astronomy - Reino Unido |
| 9 | Battaglia, Giuseppina | Mujer |
ESO - Alemania
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| 10 | Helmi, Amina | Mujer |
Univ Groningen - Países Bajos
University of Groningen, Kapteyn Astronomical Institute - Países Bajos Kapteyn Instituut - Países Bajos |
| 11 | Primas, F. | Mujer |
ESO - Alemania
|
| 12 | Francois, P. | Hombre |
Univ Paris Diderot - Francia
GEPI - Galaxies, Etoiles, Physique, Instrumentation - Francia |
| 13 | Kaufer, A. | Hombre |
ESO - Chile
European Southern Observatory Santiago - Chile |
| 14 | Szeifert, Thomas | Hombre |
ESO - Chile
European Southern Observatory Santiago - Chile |
| 15 | Arimoto, N. | - |
Natl Astron Observ Japan - Japón
National Institutes of Natural Sciences - National Astronomical Observatory of Japan - Japón |
| 16 | Sadakane, K. | - |
Osaka Kyoiku Univ - Japón
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| Fuente |
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| National Science Foundation |
| Nederlandse Organisatie voor Wetenschappelijk Onderzoek |
| NWO-VICI |
| Directorate for Mathematical and Physical Sciences |
| Agradecimiento |
|---|
| Acknowledgements. This work was made possible by a grant from NWO (614.031.018). B.L. and E.T. thank Paris Observatory for hospitality and the Programme National Galaxies financial support. We thank Marco Gullieuszik and Enrico Held for sending us in advance of publication their IR photometry for stars in our sample. M.S. thanks the National Science Foundation for support under AST-0306884. E.T. gratefully acknowledges support from an NWO-VICI grant. |