Technical

The GALAH Survey: Relative throughputs of the 2dF fibre positioner and the HERMES spectrograph from stellar targets

We present an analysis of the relative throughputs of the 3.9-metre Anglo-Australian Telescope's 2dF/HERMES system, based upon spectra acquired during the first two years of the GALAH survey. Averaged spectral fluxes of stars were compared to their photometry to determine the relative throughputs of fibres for a range of fibre position and atmospheric conditions. We find that overall the throughputs of the 771 usable fibres have been stable over the first two years of its operation. About 2.5 per cent of fibres have throughputs much lower than the average.

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The GALAH Survey: Observational Overview

We present an overview of the observational operations and strategy for the Galactic Archaeology with HERMES (GALAH) survey, a major project underway at the Anglo-Australian Telescope. GALAH is using the HERMES spectrograph with the 2dF fibre positioner at AAT to acquire high-resolution spectra in four carefully selected wavelength regions. Our ultimate goal is to observe 1.15 million stars in the Southern sky for a comprehensive study of the history of star formation, chemical enrichment, dynamical evolution and minor mergers in the Milky Way disk.

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