The GALAH+ survey: Third data release

Author:

Buder Sven123ORCID,Sharma Sanjib24ORCID,Kos Janez5,Amarsi Anish M6ORCID,Nordlander Thomas12ORCID,Lind Karin37,Martell Sarah L28ORCID,Asplund Martin9,Bland-Hawthorn Joss24ORCID,Casey Andrew R1011ORCID,De Silva Gayandhi M1213,D’Orazi Valentina14,Freeman Ken C12,Hayden Michael R24,Lewis Geraint F4ORCID,Lin Jane12,Schlesinger Katharine J1,Simpson Jeffrey D28ORCID,Stello Dennis4815,Zucker Daniel B1316,Zwitter Tomaž5ORCID,Beeson Kevin L5,Buck Tobias17ORCID,Casagrande Luca12ORCID,Clark Jake T18ORCID,Čotar Klemen5ORCID,Da Costa Gary S12ORCID,de Grijs Richard131619,Feuillet Diane320ORCID,Horner Jonathan18ORCID,Kafle Prajwal R21ORCID,Khanna Shourya22,Kobayashi Chiaki223,Liu Fan24ORCID,Montet Benjamin T8,Nandakumar Govind12ORCID,Nataf David M25ORCID,Ness Melissa K2627,Spina Lorenzo21114ORCID,Tepper-García Thor2428,Ting(丁源森) Yuan-Sen1293031,Traven Gregor20,Vogrinčič Rok5,Wittenmyer Robert A18ORCID,Wyse Rosemary F G25ORCID,Žerjal Maruša1ORCID,

Affiliation:

1. Research School of Astronomy and Astrophysics, Australian National University, ACT 2611, Australia

2. Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D), Australia

3. Max Planck Institute for Astronomy (MPIA), Koenigstuhl 17, D-69117 Heidelberg, Germany

4. Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW 2006, Australia

5. Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia

6. Theoretical Astrophysics, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden

7. Department of Astronomy, Stockholm University, AlbaNova, Roslagstullbacken 21, SE-10691 Stockholm, Sweden

8. School of Physics, UNSW, Sydney, NSW 2052, Australia

9. Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany

10. Monash Centre for Astrophysics, Monash University, Wellington Rd, Clayton, VIC 3800, Australia

11. School of Physics and Astronomy, Monash University, Wellington Rd, Clayton, VIC 3800, Australia

12. Australian Astronomical Optics, Faculty of Science and Engineering, Macquarie University, Macquarie Park, NSW 2113, Australia

13. Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia

14. Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, I-35122 Padova, Italy

15. Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

16. Macquarie University Research Centre for Astronomy, Astrophysics a Astrophotonics, Sydney, NSW 2109, Australia

17. Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany

18. Centre for Astrophysics, University of Southern Queensland, West Street, Toowoomba, QLD 4350, Australia

19. International Space Science Institute–Beijing, 1 Nanertiao, Zhongguancun, Hai Dian District, Beijing 100190, China

20. Lund Observatory, Department of Astronomy and Theoretical Physics, Box 43, SE-221 00 Lund, Sweden

21. ICRAR, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia

22. Kapteyn Astronomical Institute, University of Groningen, Landleven 12, NL-9747 AD Groningen, the Netherlands

23. Centre for Astrophysics Research, Department of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield AL10 9AB, UK

24. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia

25. Center for Astrophysical Sciences and Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA

26. Department of Astronomy, Columbia University, Pupin Physics Laboratories, New York, NY 10027, USA

27. Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, NY 10010, USA

28. Centre for Integrated Sustainability Analysis, School of Physics, The University of Sydney, NSW 2006, Australia

29. Institute for Advanced Study, Princeton, NJ 08540, USA

30. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA

31. Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

Abstract

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 Teff, log g, [Fe/H], vmic, vbroad, and vrad 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.

Funder

National Aeronautics and Space Administration

National Science Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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