Hostname: page-component-745bb68f8f-mzp66 Total loading time: 0 Render date: 2025-01-11T12:52:07.019Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
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: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Cohen, J. G., Christlieb, N., Thompson, I., et al. 2013, ApJ, 778, 56CrossRefGoogle Scholar
Gilmore, G., Norris, J. E., Monaco, L., et al. 2013, ApJ, 763, 61Google Scholar
Jablonka, P., North, P., Mashonkina, L., et al. 2015, A&A, 583, A67Google Scholar
Kobayashi, C., Karakas, A. I., & Umeda, H. 2011, MNRAS, 414, 3231CrossRefGoogle Scholar
Lai, D. K., Bolte, M., Johnson, J. A., et al. 2008, ApJ, 681, 1524CrossRefGoogle Scholar
Norris, J. E., Yong, D., Gilmore, G., & Wyse, R. F. G. 2010, ApJ, 711, 350CrossRefGoogle Scholar
Tafelmeyer, M., Jablonka, P., Hill, V., et al. 2010, A&A, 524, A58Google Scholar