The GALAH+ survey: Third data release
The GALAH+ survey: Third data release
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DOI：
10.1093/mnras/stab1242
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
S. Buder;Sanjib Sharma;J. Kos;A. Amarsi;T. Nordlander;K. Lind;S. Martell;M. Asplund;J. Bland-Ha
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文献类型：
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作者：
S. Buder;Sanjib Sharma;J. Kos;A. Amarsi;T. Nordlander;K. Lind;S. Martell;M. Asplund;J. Bland-Ha
最近光谱、天体测量和光度数据的指数级增长凸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。随着 HERMES 银河考古学 (GALAH) 调查的第三次数据发布，我们发布了 588 571 颗主要邻近恒星（81.2% 的恒星位于 2 kpc 以内）的 678 423 个光谱，这些光谱是用英澳望远镜的 HERMES 摄谱仪观测到的。此版本（称为 GALAH+ DR3）包括 GALAH 第 1 阶段（亮、主和暗巡天，70%）、K2-HERMES (17%) 和 TESS-HERMES (5%) 巡天的所有观测，以及其他 GALAH 相关项目 (8%)，包括超过 75 个恒星团的核球和观测。我们使用 Spectroscopy Made Easy (SME) 和 1D MARCS 模型大气导出恒星参数 $T_\text{eff}$、$\log g$、[Fe/H]、$v_\text{mic}$、$v_\text{broad}$ 和 $v_\text{rad}$。我们还推导出 30 种元素（其中 11 种基于非 LTE 计算）的丰度比 [X/Fe]，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、特殊星星或测量的标记，并强调所有用户都应考虑这些标记。我们的星表包含 65% 的矮星、34% 的巨星和 1% 的其他/未分类恒星。根据未标记的丰度和年龄，我们发现 62.5% 年轻的低 α 恒星、8.8% 年轻的高 α 恒星、26.9% 的老恒星和 1.8% 的 [Fe/H] < -1 恒星。根据运动学，我们发现了 4% 的光晕恒星。此数据发布附带恒星年龄、动力学、$v_\text{rad}$ 和二进制系统的增值目录。正如我们通过一些化学动力学分析所展示的那样，它们共同提供了一个高维数据集来研究当地银河系的化学动力学演化。
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.