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Impact of NLTE on research of early chemical enrichment of the dwarf galaxies

Published online by Cambridge University Press:  09 May 2016

Lyudmila Mashonkina ,
Pascale Jablonka ,
Pierre North  and
Tatyana Sitnova
Lyudmila Mashonkina
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya st. 48, RU-119017 Moscow, Russia email: lima@inasan.ru
Pascale Jablonka
Affiliation:
Laboratoire d' Astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL) Observatoire de Sauverny, CH-1290 Versoix, Switzerland
Pierre North
Affiliation:
Laboratoire d' Astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL) Observatoire de Sauverny, CH-1290 Versoix, Switzerland
Tatyana Sitnova
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya st. 48, RU-119017 Moscow, Russia email: lima@inasan.ru
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Abstract

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Based on high-resolution observed spectra, the non-local thermodynamic equilibrium (NLTE) line formation, and precise stellar atmosphere parameters, we present the first complete sample of dwarf spheroidal galaxies (dSphs) with accurate chemical abundances in the very metal-poor (VMP) regime. The obtained stellar elemental ratios are compared with chemical enrichment models, and we show that NLTE is a major step forward for studies of the dSph and the Milky Way (MW) chemical evolution.

Keywords

stars: abundancesgalaxies: abundancesgalaxies: dwarfgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 334 - 335
Copyright
Copyright © International Astronomical Union 2016 

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