论文标题
Lamost中分辨率的二进制和外来星（Lamost-MRS-B）的中等分辨率调查：观察策略和目标选择
LAMOST medium-resolution spectroscopic survey of binarity and exotic star (LAMOST-MRS-B): Observation strategy and target selection
论文作者
论文摘要
Lamost-MRS-B是杆中等分辨率（R〜7500）光谱调查的子菌群之一。它旨在研究二元恒星和外来恒星的统计特性（例如二元分数，轨道周期分布，质量比分布）。我们打算观察约30000颗恒星（10个Mag <= g <= 14.5 mag），五年来至少访问10次。我们首先计划在2018年观察25个板块周围的25个板。然后，由于观察的限制，2019年将板减少到12个板。同时，添加了位于高银河纬度的两个新板，以探索受不同环境影响的二进制特性。在这个调查项目中，我们设置了具有最高观察优先级的鉴定出的外来和低金属性星。对于所选恒星的其余部分，我们将相对更明亮的恒星优先考虑，以便获得尽可能多的高质量光谱。在Lamost-MRS-B场中获得了49129颗恒星的光谱，并在DR8中释放，其中28828和3375颗恒星分别访问了两次和十次，SNR> = 10。大多数来源是0.6 <[fe/h] <0.4 dex的B-，A-和F型星。我们还获得了347个已识别的变量和外来恒星，约有250颗恒星，具有[Fe/H] <1 dex。我们通过使用892233恒星光谱测量径向速度（RV）。 RV的不确定性分别为95％的晚期和早期型恒星，达到约1 km/s和10 km/s1。本文介绍的数据集可在http://www.doi.org/10.57760/sciencedb.j00113.00035获得。
LAMOST-MRS-B is one of the sub-surveys of LAMOST medium-resolution (R~7500) spectroscopic survey. It aims at studying the statistical properties (e.g., binary fraction, orbital period distribution, mass ratio distribution) of binary stars and exotic stars. We intend to observe about 30000 stars (10 mag <= G <= 14.5 mag) with at least 10 visits in five years. We first planned to observe 25 plates around the galactic plane in 2018. Then the plates were reduced to 12 in 2019 because of the limitation of observation. At the same time, two new plates located at the high galactic latitude were added to explore binary properties influenced by the different environments. In this survey project, we set the identified exotic and low-metallicity stars with the highest observation priorities. For the rest of the selected stars, we gave higher priority to the relatively brighter stars in order to obtain high-quality spectra as many as possible. Spectra of 49129 stars have been obtained in LAMOST-MRS-B field and released in DR8, of which 28828 and 3375 stars have been visited more than twice and ten times with SNR >= 10, respectively. Most of the sources are B-, A-, and F-type stars with 0.6 < [Fe/H] < 0.4 dex. We also obtain 347 identified variable and exotic stars and about 250 stars with [Fe/H] < 1 dex. We measure radial velocities (RVs) by using 892233 spectra of the stars. The uncertainties of RV achieve about 1 km/s and 10 km/s1 for 95% of late- and early-type stars, respectively. The datasets presented in this paper are available at http://www.doi.org/10.57760/sciencedb.j00113.00035.
