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Investigation of ancient substructures in the Milky Way: chemical composition study

Published online by Cambridge University Press:  09 March 2010

Edita Stonkutė ,
Birgitta Nordström  and
Gražina Tautvaišienė
Edita Stonkutė
Affiliation:
Institute of Theoretical Physics and Astronomy of Vilnius University, Gostauto 12, LT-01108, Vilnius, Lithuania email: edita@itpa.lt, taut@itpa.lt
Birgitta Nordström
Affiliation:
Niels Bohr Institute, Copenhagen University, Juliane Maries Vej 30, DK-2100, Copenhagen, Denmark, email: birgitta@astro.ku.dk
Gražina Tautvaišienė
Affiliation:
Institute of Theoretical Physics and Astronomy of Vilnius University, Gostauto 12, LT-01108, Vilnius, Lithuania email: edita@itpa.lt, taut@itpa.lt
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Abstract

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From high resolution spectra taken with the spectrograph FIES on the Nordic Optical Telescope, La Palma, we measure abundances of oxygen and α-elements in order to characterize stars which from their dynamical properties are suspected to have originated in disrupted satellites. We find that the chemical composition of investigated stars is homogeneous and distinct from Galactic disk dwarfs, which is providing further evidence of their extragalactic origin.

Keywords

Stars: abundancesGalaxy: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 376 - 377
Copyright
Copyright © International Astronomical Union 2010

References

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