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Properties of Radial Velocities Measurement Based on LAMOST-II Medium-resolution Spectroscopic Observations
Wang,R.1,2; Luo,A.-L.1,2; Chen,J.-J.1; Bai,Z.-R.1; Chen,L.2,3; Chen,X.-F.4; Dong,S.-B.5; Du,B.1; Fu,J.-N.6; Han,Z.-W.4; Hou,J.-L.2,3; Hou,Y.-H.2,7; Hou,W.1; Jiang,D.-K.4; Kong,X.1; Li,L.-F.4; Liu,C.1,2; Liu,J.-M.1; Qin,L.1,2; Shi,J.-R.1,2; Tian,H.1; Wu,H.1,2; Wu,C.-J.1; Xie,J.-W.8,9; Zhang,H.-T.1; Zhang,S.1,2; Zhao,G.1,2; Zhao,Y.-H.1,2; Zhong,J.3; Zong,W.-K.6; Zuo,F.1,2
2019-10-01
Source PublicationThe Astrophysical Journal Supplement Series
ISSN0067-0049
Volume244Issue:2
AbstractAbstract The radial velocity (RV) is a basic physical quantity that can be determined through the Doppler shift of the spectrum of a star. The precision of the RV measurement depends on the resolution of the spectrum we used and the accuracy of wavelength calibration. In this work, radial velocities of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope-II (LAMOST-II) medium-resolution (R ~ 7500) spectra are measured for 1,594,956 spectra (each spectrum has two wavebands) through matching with templates. A set of RV standard stars are used to recalibrate the zero point of the measurement, and some reference sets with RVs derived from medium-/high-resolution observations are used to evaluate the accuracy of the measurement. By comparing with reference sets, the accuracy of our measurement can get 0.0277 km?s?1 with respect to radial velocities of standard stars. The intrinsic precision is estimated with the multiple observations of single stars, which can be achieved to 1.36 km?s?1, 1.08 km?s?1, and 0.91 km?s?1 for the spectra at signal-to-noise levels of 10, 20, and 50, respectively.
Keywordbinaries: spectroscopic methods: data analysis techniques: spectroscopic
DOI10.3847/1538-4365/ab3cc0
Language英语
WOS IDIOP:0067-0049-244-2-ab3cc0
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28451
Collection中国科学院国家天文台
Affiliation1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China lal@nao.cas.cn, jjchen@nao.cas.cn
2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China
5.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China
6.Department of Astronomy, Beijing Normal University, Beijing 100875, People’s Republic of China
7.Nanjing Institute of Astronomical Optics, & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042, People’s Republic of China
8.School of Astronomy and Space Science, Nanjing University, Nanjing 210093, People’s Republic of China
9.Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, Nanjing 210093, People’s Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang,R.,Luo,A.-L.,Chen,J.-J.,et al. Properties of Radial Velocities Measurement Based on LAMOST-II Medium-resolution Spectroscopic Observations[J]. The Astrophysical Journal Supplement Series,2019,244(2).
APA Wang,R..,Luo,A.-L..,Chen,J.-J..,Bai,Z.-R..,Chen,L..,...&Zuo,F..(2019).Properties of Radial Velocities Measurement Based on LAMOST-II Medium-resolution Spectroscopic Observations.The Astrophysical Journal Supplement Series,244(2).
MLA Wang,R.,et al."Properties of Radial Velocities Measurement Based on LAMOST-II Medium-resolution Spectroscopic Observations".The Astrophysical Journal Supplement Series 244.2(2019).
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