The GALAH+ survey: Third data release,Monthly Notices of the Royal Astronomical Society

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The GALAH+ survey: Third data release
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-05-06 , DOI: 10.1093/mnras/stab1242
Sven Buder _{1,

2,

3} , Sanjib Sharma _{2,

4} , Janez Kos ₅ , Anish M Amarsi ₆ , Thomas Nordlander _{1,

2} , Karin Lind _{3,

7} , Sarah L Martell _{2,

8} , Martin Asplund ₉ , Joss Bland-Hawthorn _{2,

4} , Andrew R Casey _{10,

11} , Gayandhi M De Silva _{12,

13} , Valentina D’Orazi ₁₄ , Ken C Freeman _{1,

2} , Michael R Hayden _{2,

4} , Geraint F Lewis ₄ , Jane Lin _{1,

2} , Katharine J Schlesinger ₁ , Jeffrey D Simpson _{2,

8} , Dennis Stello _{4,

8,

15} , Daniel B Zucker _{13,

16} , Tomaž Zwitter ₅ , Kevin L Beeson ₅ , Tobias Buck ₁₇ , Luca Casagrande _{1,

2} , Jake T Clark ₁₈ , Klemen Čotar ₅ , Gary S Da Costa _{1,

2} , Richard de Grijs _{13,

16,

19} , Diane Feuillet _{3,

20} , Jonathan Horner ₁₈ , Prajwal R Kafle ₂₁ , Shourya Khanna ₂₂ , Chiaki Kobayashi _{2,

23} , Fan Liu ₂₄ , Benjamin T Montet ₈ , Govind Nandakumar _{1,

2} , David M Nataf ₂₅ , Melissa K Ness _{26,

27} , Lorenzo Spina _{2,

11,

14} , Thor Tepper-García _{2,

4,

28} , Yuan-Sen Ting(丁源森) _{1,

29,

30,

31} , Gregor Traven ₂₀ , Rok Vogrinčič ₅ , Robert A Wittenmyer ₁₈ , Rosemary F G Wyse ₂₅ , Maruša Žerjal ₁ ,

Affiliation

Research School of Astronomy and Astrophysics, Australian National University, ACT 2611, Australia
Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D), Australia
Max Planck Institute for Astronomy (MPIA), Koenigstuhl 17, D-69117 Heidelberg, Germany
Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW 2006, Australia
Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
Theoretical Astrophysics, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
Department of Astronomy, Stockholm University, AlbaNova, Roslagstullbacken 21, SE-10691 Stockholm, Sweden
School of Physics, UNSW, Sydney, NSW 2052, Australia
Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany
Monash Centre for Astrophysics, Monash University, Wellington Rd, Clayton, VIC 3800, Australia
School of Physics and Astronomy, Monash University, Wellington Rd, Clayton, VIC 3800, Australia
Australian Astronomical Optics, Faculty of Science and Engineering, Macquarie University, Macquarie Park, NSW 2113, Australia
Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia
Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, I-35122 Padova, Italy
Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
Macquarie University Research Centre for Astronomy, Astrophysics a Astrophotonics, Sydney, NSW 2109, Australia
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
Centre for Astrophysics, University of Southern Queensland, West Street, Toowoomba, QLD 4350, Australia
International Space Science Institute–Beijing, 1 Nanertiao, Zhongguancun, Hai Dian District, Beijing 100190, China
Lund Observatory, Department of Astronomy and Theoretical Physics, Box 43, SE-221 00 Lund, Sweden
ICRAR, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Kapteyn Astronomical Institute, University of Groningen, Landleven 12, NL-9747 AD Groningen, the Netherlands
Centre for Astrophysics Research, Department of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield AL10 9AB, UK
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
Center for Astrophysical Sciences and Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
Department of Astronomy, Columbia University, Pupin Physics Laboratories, New York, NY 10027, USA
Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, NY 10010, USA
Centre for Integrated Sustainability Analysis, School of Physics, The University of Sydney, NSW 2006, Australia
Institute for Advanced Study, Princeton, NJ 08540, USA
Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA
Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

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, log g, [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.

中文翻译：

GALAH+ 调查：第三次数据发布

摘要

恒星化学元素丰度测量的集合，连同精确的距离和轨道特性，为研究银河系的演化提供了高维数据。通过 HERMES 银河考古学 (GALAH) 调查的第三次数据发布，我们发布了 588 571 颗主要是附近恒星的 678 423 个光谱（81.2% 的恒星在 <2 kpc 内），这些光谱是用 HERMES 光谱仪在英澳望远镜。此版本（以下简称 GALAH+ DR3）包括来自 GALAH 阶段 1（明亮、主要和昏暗调查，70%）、K2-HERMES（17%）、TESS-HERMES（5%）和部分辅助观测（8%），包括膨胀和 >75 个星团。我们推导出恒星参数T _eff , log g , [Fe/H],v_麦克风，v_宽，和v_弧度使用我们的频谱合成的代码光谱一点通（修改版SME）和1D榨渣模型大气压。我们用盖亚的天体测量法打破光谱分析中的光谱简并来自 2MASS 的 DR2 和光度测量。我们报告了 30 种不同元素（其中 11 种基于非 LTE 计算）的丰度比 [X/Fe]，涵盖了五种核合成途径。我们描述了准确性和精确度的验证、特殊恒星/测量的标记以及使用我们结果的建议。我们的目录包括 65% 的矮星、34% 的巨星和 1% 的其他/未分类恒星。根据未标记的化学成分和年龄，我们发现 62% 的年轻低 $\alpha$、9% 年轻的高 $\alpha$、27% 老高 $\alpha$，以及 2% 的恒星具有 [ Fe/H] ≤ -1。根据运动学，4% 是晕星。几个增值目录，包括恒星年龄和动力学，在盖亚之后更新 eDR3 随此版本一起发布，并允许进行时间化学动力学分析，正如我们所展示的那样。

更新日期：2021-07-12

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