Issue |
EAS Publications Series
Volume 67-68, 2014
The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases
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Page(s) | 219 - 226 | |
Section | The Origin and History of the Milky Way | |
DOI | https://doi.org/10.1051/eas/1567039 | |
Published online | 17 July 2015 |
N.A. Walton, F. Figueras, L. Balaguer-Núñez and C. Soubiran (eds)
EAS Publications Series, 67–68 (2014) 219-226
GALAH survey: chemically tagging the thick disk
1 Sydney Institute for Astronomy, University of Sydney, NSW 2006, Australia
2 Mount Stromlo Observatory, Australia National University, Woden, ACT 2116, Australia
The GALAH survey targets one million stars in the southern hemisphere down to a limiting magnitude of V = 14 at the Anglo-Australian Telescope. The project aims to measure up to 30 elemental abundances and radial velocities (≈1 km s−1 accuracy) for each star at a resolution of R = 28,000. These elements fall into 8 independent groups (e.g.α, Fe peak, r-process). For all stars, Gaia will provide distances to 1% and transverse velocities to 1 km s−1 or better, giving us a 14D set of parameters for each star, i.e. 6D phase space and 8D abundance space. There are many scientific applications but here we focus on the prospect of chemically tagging the thick disk and making a direct measurement of how stellar migration evolves with cosmic time.
© EAS, EDP Sciences, 2015