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GALAH survey: chemically tagging the thick disk

Published online by Cambridge University Press:  17 July 2015

J. Bland-Hawthorn ,
S. Sharma  and
K. Freeman
J. Bland-Hawthorn
Affiliation:
Sydney Institute for Astronomy, University of Sydney, NSW 2006, Australia
S. Sharma
Affiliation:
Sydney Institute for Astronomy, University of Sydney, NSW 2006, Australia
K. Freeman
Affiliation:
Mount Stromlo Observatory, Australia National University, Woden, ACT 2116, Australia
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Abstract

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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 68: The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases , 2014 , pp. 219 - 226
Copyright
© EAS, EDP Sciences, 2015

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