论文标题
Galah+调查：第三个数据发布
The GALAH+ Survey: Third Data Release
论文作者
论文摘要
恒星的化学元素丰度测量的合奏以及精确的距离和轨道特性提供了高维数据，以研究银河系的演变。通过使用爱马仕（Galah）调查的银河考古学的第三次数据发布，我们发布了678 423光谱，用于588 571大多数附近的恒星（81.2％的恒星在<2 kpc之内），在盎格鲁 - 澳大利亚望远镜上观察到爱马仕光谱仪。此版本（以下称为Galah+ Dr3）包括Galah第1阶段（明亮，主和微弱的调查，70％），K2-Hermes（17％），Tess-Hermes（5％）和辅助观测值（8％）（包括凸起和> 75个恒星分子）的所有观察结果。我们得出了恒星参数$ t_ \ text {eff} $，$ \ log g $，[fe/h]，$ v_ \ text {麦克风} $，$ v_ \ text {froad} $＆$ v_ \ v_ \ text {rad {rad {rad} $，使用我们修改的Spectrum合成代码光谱法的修改版本使（Sme）变得容易（Sme）和1 nd Marcers Marcers Marcers resce and Marcers yd Marcs rescer。我们在频谱分析中打破了光谱脱位，从$ Gaia $ dr2和2mass的光度法从天体分析中打破了光谱。我们报告了30个不同元素（其中11个基于非LTE计算）的丰度比[X/FE]涵盖了五个核合成途径。我们描述了准确性和精确度的验证，标记了特殊的恒星/测量结果以及使用我们的结果的建议。我们的目录包括65％的矮人，34％的巨人和1％的其他/未分类的恒星。基于未覆盖的化学成分和年龄，我们发现62％Young Low-$α$，9％的年轻高$α$，27％的老高$α$，以及2％的恒星，带有$ \ Mathrm {[Fe/H]} \ Leq -1 $。基于运动学，有4％是光环恒星。此版本伴随着$ GAIA $ EDR3以$ GAIA $ EDR3的更新，包括出色的年龄和动力学，包括出色的年龄和动力学，并允许在我们展示时，并允许Chrono-femproghnannalnical分析。
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% 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%), K2-HERMES (17%), TESS-HERMES (5%), and a subset of ancillary observations (8%) including the bulge and >75 stellar clusters. We derive stellar parameters $T_\text{eff}$, $\log g$, [Fe/H], $v_\text{mic}$, $v_\text{broad}$ & $v_\text{rad}$ 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% dwarfs, 34% giants, and 1% other/unclassified stars. Based on unflagged chemical composition and age, we find 62% young low-$α$, 9% young high-$α$, 27% old high-$α$, and 2% stars with $\mathrm{[Fe/H]} \leq -1$. Based on kinematics, 4% 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.
