The GALAH+ survey: Third data release

S. Buder, Sanjib Sharma, J. Kos, A. Amarsi, T. Nordlander, K. Lind, S. Martell, M. Asplund, J. Bland-Hawthorn, A. Casey, G. D. De Silva, V. D’Orazi, K. Freeman, M. Hayden, G. Lewis, Jane Lin, K. Schlesinger, J. Simpson, D. Stello, D. Zucker, T. Zwitter, K. Beeson, T. Buck, L. Casagrande, Jake T. Clark, K. Čotar, G. D. Da Costa, R. de Grijs, D. Feuillet, J. Horner, P. Kafle, S. Khanna, C. Kobayashi, Fan Liu, B. Montet, G. Nandakumar, D. Nataf, M. Ness, L. Spina, T. Tepper-García, Yuan-Sen Ting(丁源森), G. Traven, R. Vogrinčič, R. Wittenmyer, R. Wyse, M. Žerjal
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引用次数: 123

Abstract

The recent exponential increase in spectroscopic, astrometric & photometric data has highlighted the scientific opportunities afforded by obtaining an ensemble of chemical element abundances for stars with precision distance & orbit measurements. 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% of stars lie within 2 kpc), observed with the HERMES spectrograph at the Anglo-Australian Telescope. This release (referred to as GALAH+ DR3) includes all observations from GALAH Phase 1 (bright, main, & faint survey, 70%), the K2-HERMES (17%) & TESS-HERMES (5%) surveys, as well as additional GALAH-related projects (8%) including the bulge & observations of more than 75 stellar clusters. We derive stellar parameters $T_\text{eff}$, $\log g$, [Fe/H], $v_\text{mic}$, $v_\text{broad}$ & $v_\text{rad}$ using Spectroscopy Made Easy (SME) & 1D MARCS model atmospheres. We also derive abundance ratios [X/Fe] for 30 elements (11 of which based on non-LTE computations), that cover 5 nucleosynthetic pathways: Li, C, O, Na, Mg, Al, Si, K, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Mo, Ru, Ba, La, Ce, Nd, Sm, Eu. We describe our validations for accuracy & precision, flagging of peculiar stars or measurements & stress that all users should take these flags into account. Our catalogue comprises 65% dwarfs, 34% giants & 1% other/unclassified stars. Based on unflagged abundances & age, we find 62.5% young low-alpha stars, 8.8% young high-alpha stars, 26.9% old stars & 1.8% stars with [Fe/H] < -1. Based on kinematics, we find 4% halo stars. Value-Added-Catalogs for stellar ages, dynamics, $v_\text{rad}$ & binary systems accompany this data release. Together they provide a high-dimensional data set to study the chemodynamic evolution of the local Milky Way, as we showcase with a few chemodynamic analyses.
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GALAH+调查:第三次数据发布
最近光谱学、天体测量学和光度学数据的指数级增长,突显了通过精确的距离和轨道测量获得恒星化学元素丰度集合所提供的科学机会。在“银河考古与赫尔姆斯”(GALAH)巡天的第三次数据发布中,我们发布了588 571颗恒星的678 423个光谱,这些恒星大多是附近的恒星(81.2%的恒星位于2千公里以内),这些恒星是用英澳望远镜上的赫尔姆斯光谱仪观测到的。这个版本(被称为GALAH+ DR3)包括GALAH第一阶段的所有观测结果(明亮、主、暗巡天,占70%),K2-HERMES(17%)和TESS-HERMES(5%)巡天,以及额外的GALAH相关项目(8%),包括超过75个恒星团的隆起和观测。我们利用光谱学(SME)和1D MARCS模型大气导出了恒星参数$T_\text{eff}$, $\log g$, [Fe/H], $v_\text{mic}$, $v_\text{broad}$和$v_\text{rad}$。我们还得出了30种元素的丰度比[X/Fe](其中11种基于非lte计算),涵盖5种核合成途径:Li, C, O, Na, Mg, Al, Si, K, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Mo, Ru, Ba, La, Ce, Nd, Sm, Eu。我们描述了我们对准确性和精度的验证,标记特殊的星星或测量和压力,所有用户都应该考虑到这些标志。我们的星表包括65%的矮星,34%的巨星和1%的其他/未分类的恒星。根据未标记的丰度和年龄,我们发现62.5%的年轻低α恒星,8.8%的年轻高α恒星,26.9%的年老恒星和1.8%的[Fe/H] < -1的恒星。根据运动学,我们发现了4%的晕星。附加的星表,恒星年龄,动力学,$v_\text{rad}$ &双星系统随此数据发布。它们一起提供了高维数据集来研究本地银河系的化学动力学演化,正如我们通过一些化学动力学分析所展示的那样。
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