The GALAH Survey: Scientific Motivation

Abstract

The GALAH survey is a large high-resolution spectroscopic survey using the newly commissioned HERMES spectrograph on the Anglo-Australian Telescope. The HERMES spectrograph provides high-resolution (R ~28,000) spectra in four passbands for 392 stars simultaneously over a 2 degree field of view. The goal of the survey is to unravel the formation and evolutionary history of the Milky Way, using fossil remnants of ancient star formation events which have been disrupted and are now dispersed throughout the Galaxy. Chemical tagging seeks to identify such dispersed remnants solely from their common and unique chemical signatures; these groups are unidentifiable from their spatial, photometric or kinematic properties. To carry out chemical tagging, the GALAH survey will acquire spectra for a million stars down to V~14. The HERMES spectra of FGK stars contain absorption lines from 29 elements including light proton-capture elements, alpha-elements, odd-Z elements, iron-peak elements and n-capture elements from the light and heavy s-process and the r-process. This paper describes the motivation and planned execution of the GALAH survey, and presents some results on the first-light performance of HERMES.

16 pages, 7 figures

References in corpus (27)

• The K2 Mission: Characterization and Early results
• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• Two Stellar Components in the Halo of the Milky Way
• Nucleosynthetic signatures of the first stars
• Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
• An extremely primitive halo star
• The stellar halo of the Galaxy
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• Radius determination of solar-type stars using asteroseismology: What to expect from the Kepler mission
• Lithium Depletion of Nearby Young Stellar Associations
• Multi-Element Abundance Measurements from Medium-Resolution Spectra. IV. Alpha Element Distributions in Milky Way Dwarf Satellite Galaxies
• Chemical Homogeneity in Collinder 261 and Implications for Chemical Tagging
• APASS Landolt-Sloan BVgri photometry of RAVE stars. I. Data, effective temperatures and reddenings
• Disentangling the Hercules stream
• Kinematic modelling of the Milky Way using the RAVE and GCS stellar surveys
• Stroemgren survey for Asteroseismology and Galactic Archaeology: let the SAGA begin
• A 3D extinction map of the Northern Galactic Plane based on IPHAS photometry
• The Kinematics of Thick Disks in Nine External Galaxies
• The halo+cluster system of the Galactic globular cluster NGC1851
• Pseudo Three-dimensional Maps of the Diffuse Interstellar Band at 862 nm
• Elemental Abundances of Solar Sibling Candidates
• O, Na, Ba and Eu abundance patterns in open clusters
• Reconstructing fossil sub-structures of the Galactic disk: clues from abundance patterns of old open clusters and moving groups
• Does SEGUE/SDSS indicate a dual Galactic halo?
• Metallicity Bias in the Kinematics of the Milky Way Stellar Halo
• The Gaia-ESO Survey: Properties of the intermediate age open cluster NGC 4815
• Stellar Nucleosynthesis in the Hyades Open Cluster

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