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首页> 外文期刊>The Astrophysical Journal. Supplement Series >Probing the Galactic Halo with RR Lyrae Stars. I. The Catalog
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Probing the Galactic Halo with RR Lyrae Stars. I. The Catalog

机译：用RR Lyrae星星探测银河系。 I.目录

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摘要

We present a catalog of 5290 RR Lyrae stars (RRLs) with metallicities estimated from spectra of the LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) and the Sloan Extension for Galactic Understanding and Exploration (SEGUE) surveys. Nearly 70% of them (3642 objects) also have systemic radial velocities measured. Given the pulsating nature of RRLs, metallicity estimates are based on spectra of individual exposures that have been matched with their synthetic templates. The systemic radial velocities are measured by fitting the observed velocity as a function of phase assuming an empirical pulsating velocity template curve. Various tests show that our analyses yield metallicities with a typical precision of 0.20 dex and systemic radial velocities with uncertainties ranging from 5 to 21 km s(-1) (depending on the number of radial-velocity measurements available for a given star). Based on the well-calibrated near-infrared PM(W1)Z or PM(Ks)Z, and M-V-[Fe/H] relations, precise distances are derived for these RRLs. Finally, we include Gaia DR2 proper motions in our catalog. The catalog should be very useful for various Galactic studies, especially of the Galactic halo.
机译：我们提出了5290 rr Lyrae星（RRL）的目录，其中包含了从拉莫斯特实验的光谱估计的银河理解和勘探（Lefue）以及银河理解和勘探（SEGUE）调查的斯隆延伸。其中近70％（3642个物体）也具有测量的系统性径向速度。鉴于RRL的脉动性质，金属性估计基于与其合成模板匹配的各个曝光的光谱。通过拟合观察到的速度作为假设经验脉动速度模板曲线的相位函数来测量系统径向速度。各种测试表明，我们的分析产生了典型精度为0.20 dex和系统径向速度的金属，不确定性范围为5至21km s（-1）（取决于给定星的可用径向速度测量的数量）。基于良好校准的近红外PM（W1）Z或PM（ks）z，并且M-V-[Fe / H]关系，为这些RRL导出精确的距离。最后，我们在目录中包括盖亚DR2适当的运动。目录对于各种银河研究，特别是半乳清光环来说应该是非常有用的。

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