论文标题
用rr lyre恒星I探测银河系光环I：目录
Probing the galactic halo with RR Lyrae stars I: The catalog
论文作者
论文摘要
我们提供了5,290 Rr Lyre恒星（RRL）的目录，并从Lamost实验的光谱中估算出用于银河系理解和勘探（Legue）的金属性（Legue）和Sloan扩展，以进行银河系理解和探索（SEGUE）调查。其中将近70％（3,642个物体）也测量了全身性径向速度。鉴于RRL的脉动性质，金属性估计值是基于单个暴露的光谱，通过将它们与合成模板匹配。通过拟合观察到的速度作为相位的函数，假设经验脉动速度模板曲线来测量全身性径向速度。各种测试表明，我们的分析产生的金属性典型精度为0.20 \，DEX和全身性径向速度，不确定性为5至21 \，km \，s $^{ - 1} $（取决于给定恒星可用于径向速度测量值的数量）。基于校准的近红外$ pm_ {w1} z $或$ pm_ {k _ {\ rm s}} Z $，以及$ m_ {v} $ - [fe/h]关系，这些RRL的精确距离被得出。最后，我们在目录中包括Gaia DR2的适当动作。该目录对于各种银河系研究，尤其是银河系光环应该非常有用。
We present a catalog of 5,290 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 per cent of them (3,642 objects) also have systemic radial velocities measured. Given the pulsating nature of RRLs, metallicity estimates are based on spectra of individual exposures, by matching them with the 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 $PM_{K_{\rm s}}Z$, 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.
