Journal article
The GALAH plus survey: Third data release
Monthly notices of the Royal Astronomical Society, Vol.506(1), pp.150-201
07/06/2021
DOI: 10.1093/mnras/stab1242
Abstract
The ensemble of chemical element abundance measurements for stars, along with precision distances and orbit properties, provides high-dimensional data to study the evolution of the Milky Way. With this third data release of the Galactic Archaeology with HERMES (GALAH) survey, we publish 678 423 spectra for 588 571 mostly nearby stars (81.2 per cent of stars are within <2 kpc), observed with the HERMES spectrograph at the Anglo-Australian Telescope. This release (hereafter GALAH+ DR3) includes all observations from GALAH Phase 1 (bright, main, and faint survey, 70 per cent), K2-HERMES (17 per cent), TESS-HERMES (5 per cent), and a subset of ancillary observations (8 per cent) including the bulge and >75 stellar clusters. We derive stellar parameters T-eff, logg, [Fe/H], v(mic), v(broad), and v(rad) using our modified version of the spectrum synthesis code Spectroscopy Made Easy (SME) and 1D MARCS model atmospheres. We break spectroscopic degeneracies in our spectrum analysis with astrometry from Gaia DR2 and photometry from 2MASS. We report abundance ratios [X/Fe] for 30 different elements (11 of which are based on non-LTE computations) covering five nucleosynthetic pathways. We describe validations for accuracy and precision, flagging of peculiar stars/measurements and recommendations for using our results. Our catalogue comprises 65 per cent dwarfs, 34 per cent giants, and 1 per cent other/unclassified stars. Based on unflagged chemical composition and age, we find 62 per cent young low-alpha, 9 per cent young high-alpha, 27 per cent old high-alpha, and 2 per cent stars with [Fe/H] <= -1. Based on kinematics, 4 per cent are halo stars. Several Value-Added-Catalogues, including stellar ages and dynamics, updated after Gaia eDR3, accompany this release and allow chrono-chemodynamic analyses, as we showcase.
Details
- Title: Subtitle
- The GALAH plus survey: Third data release
- Creators
- Sven Buder - Australian National UniversitySanjib Sharma - The University of SydneyJanez Kos - University of LjubljanaAnish M. Amarsi - Uppsala UniversityThomas Nordlander - ARC Centre of Excellence for All-sky AstrophysicsKarin Lind - AlbaNovaSarah L. Martell - UNSW SydneyMartin Asplund - Max Planck Institute for AstrophysicsJoss Bland-Hawthorn - ASTRO-3DAndrew R. Casey - Monash UniversityGayandhi M. De Silva - Macquarie UniversityValentina D'Orazi - Ist Nazl Astrofis Osservat Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, ItalyKen C. Freeman - Australian National UniversityMichael R. Hayden - The University of SydneyGeraint F. Lewis - The University of SydneyJane Lin - Australian National UniversityKatharine J. Schlesinger - Australian National UniversityJeffrey D. Simpson - ASTRO-3DDennis Stello - UNSW SydneyDaniel B. Zucker - Macquarie UniversityTomaz Zwitter - University of LjubljanaKevin L. Beeson - University of LjubljanaTobias Buck - Leibniz Institute for Astrophysics PotsdamLuca Casagrande - Australian National UniversityJake T. Clark - University of Southern QueenslandKlemen Cotar - University of LjubljanaGary S. Da Costa - Australian National UniversityRichard de Grijs - Macquarie UniversityDiane Feuillet - Max Planck Institute for AstronomyJonathan Horner - University of Southern QueenslandPrajwal R. Kafle - International Centre for Radio Astronomy ResearchShourya Khanna - University of GroningenChiaki Kobayashi - ARC Centre of Excellence for All-sky AstrophysicsFan Liu - Swinburne University of TechnologyBenjamin T. Montet - UNSW SydneyGovind Nandakumar - Australian National UniversityDavid M. Nataf - Johns Hopkins UniversityMelissa K. Ness - Columbia UniversityLorenzo Spina - ARC Centre of Excellence for All-sky AstrophysicsThor Tepper-Garcia - The University of SydneyYuan-Sen Ting - Australian National UniversityGregor Traven - Lund UniversityRok Vogrincic - University of LjubljanaRobert A. Wittenmyer - University of Southern QueenslandRosemary F. G. Wyse - Johns Hopkins UniversityMarusa Zerjal - Australian National UniversityGALAH Collaboration
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.506(1), pp.150-201
- DOI
- 10.1093/mnras/stab1242
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Publisher
- Oxford Univ Press
- Number of pages
- 52
- Grant note
- Stromlo Distinguished Visitorship at the ANU VR 2016-03765; 2016-03412 / Swedish Research Council; European Commission 2016-03412 / Knut and Alice Wallenberg foundation; Knut & Alice Wallenberg Foundation CE170100013 / Australian Research Council Centre of Excellence; Australian Research Council C4000127986 / European Space Agency (PRODEX Experiment Arrangement); European Space Agency National Aeronautics and Space Administration; National Aeronautics & Space Administration (NASA) Alexander von Humboldt Foundation 852977 / European Research Council (ERC) under the European Union; European Research Council (ERC) y89 / Australian Government through the National Computational Infrastructure (NCI) under the National Computational Merit Allocation Scheme Swedish strategic research programme eSSENCE
- Language
- English
- Date published
- 07/06/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701824702771
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