标题： 基于LAMOST低分辨率光谱利用DD-Payne得到的FGK型恒星的均匀大气参数和22种元素丰度 显示英文标题

标题： Homogeneous Stellar Atmospheric Parameters and 22 Elemental Abundances for FGK Stars Derived From LAMOST Low-resolution Spectra with DD-Payne

摘要： 对我们的银河系有深入的了解需要通过恒星的化学指纹来详细分解其恒星群体。 这要求大量恒星具有许多元素的精确丰度。 在这里，我们利用LAMOST低分辨率光谱和DD-Payne以物理上合理且严谨的方式提供了一个更新的恒星标签目录，以高分辨率光谱的标签作为训练集。 该目录包含了来自LAMOST DR9发布的640万颗恒星的大气参数，以及近360万颗信噪比（SNR）高于20的恒星的22种元素的丰度，这些元素包括C、N、O、Na、Mg、Al、Si、Ca、Ti、Cr、Mn、Fe、Ni、Sr、Y、Zr、Ba、La、Ce、Nd、Sm和Eu。 [Fe/H]的有效性可以达到$\sim$-4.0，而元素丰度比[X/Fe]对大多数[Fe/H]$\gtrsim-2.0$的恒星有效。 这些标签的测量误差对信噪比敏感，并且几乎与其成反比关系。 对于信噪比大于50的恒星，我们得到了Teff的典型误差为30K，$\log g$的误差为0.07 dex，大多数原子序数小于Sr的元素的丰度误差为$\sim0.05$dex，而较重元素的丰度误差为0.1-0.2 dex。 通过专门的内部和外部校准对标签估计进行了归一化。 特别是，对[Fe/H]估计进行了非局部热平衡效应的校正，Teff校准到红外通量法标度，$\log~g$通过星震测量进行了验证。 使用宽双星对元素丰度进行了内部校准，消除了有效温度的系统趋势。 该目录是公开可获得的。 显示英文摘要

摘要： A deep understanding of our Galaxy desires detailed decomposition of its stellar populations via their chemical fingerprints. This requires precise stellar abundances of many elements for a large number of stars. Here we present an updated catalog of stellar labels derived from LAMOST low-resolution spectra in a physics-sensible and rigorous manner with DD-Payne, taking labels from high-resolution spectroscopy as training set. The catalog contains atmospheric parameters for 6.4 million stars released in LAMOST DR9, and abundances for 22 elements, namely, C, N, O, Na, Mg, Al, Si, Ca, Ti, Cr, Mn, Fe, Ni, Sr, Y, Zr, Ba, La, Ce, Nd, Sm, and Eu, for nearly 3.6 million stars with spectral signal-to-noise ratio (SNR) higher than 20. The [Fe/H] is valid down to $\sim$-4.0, while elemental abundance ratios [X/Fe] are mostly valid for stars with [Fe/H] $\gtrsim-2.0$. Measurement errors in these labels are sensitive to and almost inversely proportional with SNR. For stars with S/N>50, we achieved a typical error of 30 K in Teff, 0.07 dex in $\log g$, $\sim0.05$ dex in abundances for most elements with atomic number smaller than Sr, and 0.1--0.2 dex for heavier elements. Homogenization to the label estimates is carried out via dedicated internal and external calibration. In particular, the non-local thermal equilibrium effect is corrected for the [Fe/H] estimates, the Teff is calibrated to the infrared flux method scale, and the $\log~g$ is validated with asteroseismic measurements. The elemental abundances are internally calibrated using wide binaries, eliminating systematic trend with effective temperature. The catalog is publicly available.