The GALAH survey: observational overview and Gaia DR1 companion

Martell, S. L. and Sharma, S. and Buder, S. and Duong, L. and Schlesinger, K. J. and Simpson, J. and Lind, K. and Ness, M. and Marshall, J. P. and Asplund, M. and Bland-Hawthorn, J. and Casey, A. R. and de Silva, G. and Freeman, K. C. and Kos, J. and Lin, J. and Zucker, D. B. and Zwitter, T. and Anguiano, B. and Bacigalupo, C. and Carollo, D. and Casagrande, L. and Da Costa, G. S. and Horner, J. and Huber, D. and Hyde, E. A. and Kafle, P. R. and Lewis, G. F. and Nataf, D. and Navin, C. A. and Stello, D. and Tinney, C. G. and Watson, F. G. and Wittenmyer, R. (2017) The GALAH survey: observational overview and Gaia DR1 companion. Monthly Notices of the Royal Astronomical Society, 465 (3). pp. 3203-3219. ISSN 0035-8711

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The Galactic Archaeology with HERMES (GALAH) Survey is a massive observational project to trace the Milky Way's history of star formation, chemical enrichment, stellar migration and minor mergers. Using high-resolution (R$\simeq$28,000) spectra taken with the High Efficiency and Resolution Multi-Element Spectrograph (HERMES) instrument at the Anglo-Australian Telescope (AAT), GALAH will determine stellar parameters and abundances of up to 29 elements for up to one million stars. Selecting targets from a colour-unbiased catalogue built from 2MASS, APASS and UCAC4 data, we expect to observe dwarfs at 0.3 to 3 kpc and giants at 1 to 10 kpc. This enables a thorough local chemical inventory of the Galactic thin and thick disks, and also captures smaller samples of the bulge and halo. In this paper we present the plan, process and progress as of early 2016 for GALAH survey observations. In our first two years of survey observing we have accumulated the largest high-quality spectroscopic data set at this resolution, over 200,000 stars. We also present the first public GALAH data catalogue: stellar parameters (Teff, log(g), [Fe/H], [alpha/Fe]), radial velocity, distance modulus and reddening for 10680 observations of 9860 Tycho-2 stars that may be included in the first Gaia data release.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Third place award winner of the USQ Publication Excellence Award for Journal Articles published Jan-March 2017. Access to Published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 12 Apr 2017 00:30
Last Modified: 15 Feb 2019 01:30
Uncontrolled Keywords: stars; abundances; galaxy; formation; evolution; stellar content
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020104 Galactic Astronomy
Identification Number or DOI: 10.1093/mnras/stw2835

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