The relative calibration of radial velocity for LAMOST medium resolution stellar spectra  

作　　者：Jian-Ping Xiong Bo Zhang Chao Liu Jiao Li Yong-Heng Zhao Yong-Hui Hou 

机构地区：[1]Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Astronomy,Beijing Normal University,Beijing 100875,China [4]Key Laboratory of Space Astronomy and Technology,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101 China [5]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650011,China [6]Nanjing Institute of Astronomical Optics&Technology,National Astronomical Observatories,Chinese Academy of Sciences,Nanjing 210042,China [7]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Research in Astronomy and Astrophysics》2021年第10期239-249,共11页天文和天体物理学研究（英文版）

基　　金：supported by National Key R&D Program of China(No.2019YFA0405500);the National Natural Science Foundation of China(NSFC,Grant No.11835057);the State Natural Sciences Foundation Monumental Projects(Nos.12090040.Z.W.H,12090041.H.W.);The Guoshoujing Telescope(the Large Sky Area Multi-Object Fiber Spectroscopic Telescope,LAMOST)is a National Major Scientific Project built by the Chinese Academy of Sciencesprovided by the National Development and Reform Commission。

摘　　要：The Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST)started a medianresolution spectroscopic(MRS,R~7500)survey since October 2018.The main scientific goals of MRS,including binary stars,pulsators and other variable stars,were launched with a time-domain spectroscopic survey.However,the systematic errors,including the bias induced from wavelength calibration and the systematic difference between different spectrographs,have to be carefully considered during radial velocity measurement.In this work,we provide a technique to correct the systematics in the wavelength calibration based on the relative radial velocity measurements from LAMOST MRS spectra.We show that,for the stars with multi-epoch spectra,the systematic bias which is induced from the exposures on different nights can be corrected well for LAMOST MRS in each spectrograph.In addition,the precision of radial velocity zero-point of multi-epoch time-domain observations reaches below 0.5 km s^(-1).As a by-product,we also give the constant star candidates^(**),which can be the secondary radial-velocity standard star candidates of LAMOST MRS time-domain surveys.

关 键 词：methods:data analysis techniques:radial velocities stars:statistics catalogs surveys 

分 类 号：P111.2[天文地球—天文学]