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: Data Reduction and Management

We present data reduction procedures used in the GALAH survey, utilizing the multi-fibre spectroscope HERMES and the 3.9 meter Anglo-Australian telescope. GALAH is a unique survey, targeting 1 million stars brighter than magnitude V=14 with a resolution of 28,000 and a goal to measure abundances of 30 elements. We outline the design and present all the steps in the Iraf-based reduction pipeline. The pipeline takes advantage of existing Iraf routines and other readily available software in order to be simple to maintain, tested and reliable.

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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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