The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) is an unbiased, massively multiplexed spectroscopic survey, designed to measure the expansion history of the universe through low-resolution (R ∼ 750) spectra of Lyα emitters. In its search for these galaxies, HETDEX will also observe a few times 10⁵ stars. In this paper, we present the first stellar value-added catalog within the internal second data release of the HETDEX Survey (HDR2). The new catalog contains 120,571 low-resolution spectra for 98,736 unique stars between 10 < G < 22 spread across the HETDEX footprint at relatively high (b ∼ 60) Galactic latitudes. With these spectra, we measure radial velocities (RVs) for ∼42,000 unique FGK-type stars in the catalog and show that the HETDEX spectra are sufficient to constrain these RVs with a 1σ precision of 28.0 km s⁻¹ and bias of 3.5 km s⁻¹ with respect to the Large Sky Area Multi-Object Fibre Spectroscopic Telescope surveys and 1σ precision of 27.5 km s⁻¹ and bias of 14.0 km s⁻¹ compared to the Sloan Extension for Galactic Understanding and Exploration survey. Since these RVs are for faint (G ≥ 16) stars, they will be complementary to Gaia. Using t-Distributed Stochastic Neighbor Embedding (tSNE), we also demonstrate that the HETDEX spectra can be used to determine a star’s T _eff, and log g and its [Fe/H]. With the tSNE projection of the FGK-type stars with HETDEX spectra we also identify 416 new candidate metal-poor ([Fe/H] < −1 dex) stars for future study. These encouraging results illustrate the utility of future low-resolution stellar spectroscopic surveys.

在业余爱好-埃伯利望远镜暗能量实验（HETDEX）是一个无偏，大规模复用分光调查，旨在通过低分辨率（测量宇宙膨胀历史ř Ly的〜750）光谱α发射体。在寻找这些星系的过程中，HETDEX 还将多次观测 10颗⁵星。在本文中，我们展示了 HETDEX 调查 (HDR2) 内部第二次数据发布中的第一个恒星增值目录。新的目录中包含10 <之间为98736独特分120571低分辨率光谱ģ <横跨HETDEX足迹22蔓延在相对高的（b∼ 60) 银河系纬度。通过这些光谱，我们测量了目录中 42,000 颗独特的 FGK 型恒星的径向速度 (RV)，并表明 HETDEX 光谱足以以28.0 km s ^-1的 1 σ精度和 3.5 km 的偏差约束这些 RV s ^-1关于大天空区域多目标光纤光谱望远镜勘测和 1 σ精度为 27.5 km s ^-1和偏差为 14.0 km s ^-1与银河理解和探索调查的 Sloan Extension 相比。由于这些 RVs 适用于微弱 ( G≥ 16) 颗星，它们将与盖亚互补。使用 t 分布随机邻域嵌入 (tSNE)，我们还证明了 HETDEX 光谱可用于确定恒星的T _eff和 log g及其 [Fe/H]。通过具有 HETDEX 光谱的 FGK 型恒星的 tSNE 投影，我们还确定了 416 颗新的候选贫金属 ([Fe/H] < -1 dex) 恒星以供未来研究。这些令人鼓舞的结果说明了未来低分辨率恒星光谱调查的实用性。