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Self-consistent Stellar Radial Velocities from LAMOST Medium-resolution Survey DR7
Zhang, Bo1; Li, Jiao2; Yang, Fan1,3,4; Xiong, Jian-Ping3,4; Fu, Jian-Ning1; Liu, Chao2; Tian, Hao2; Li, Yin-Bi3; Wang, Jia-Xin1; Liang, Cai-Xia5,6; Zhou, Yu-Tao7,8; Zong, Weikai1; Yang, Cheng-Qun9; Liu, Nian10; Hou, Yong-Hui4,11
2021-09-01
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
ISSN0067-0049
Volume256Issue:1Pages:19
AbstractRadial velocity (RV) is among the most fundamental physical quantities obtainable from stellar spectra and is rather important in the analysis of time-domain phenomena. LAMOST Medium-resolution Survey (MRS) DR7 contains five million single-exposure stellar spectra with spectral resolution R similar to 7500. However, the temporal variation of the RV zero-points (RVZPs) of the MRS, which makes the RVs from multiple epochs inconsistent, has not been addressed. In this paper, we measure the RVs of 3.8 million single-exposure spectra (for 0.6 million stars) with signal-to-noise ratios (S/N) higher than 5 based on the cross-correlation function method, and propose a robust method to self-consistently determine the RVZPs exposure by exposure for each spectrograph with the help of Gaia DR2 RVs. Such RVZPs are estimated for 3.6 million RVs and can reach a mean precision of similar to 0.38 km s(-1). The result of the temporal variation of RVZPs indicates that our algorithm is efficient and necessary before we use the absolute RVs to perform time-domain analyses. Validating the results with APOGEE DR16 shows that our absolute RVs can reach an overall precision of 0.84/0.80 km s(-1) in the blue/red arm at 50 < S/N < 100 and of 1.26/1.99 km s(-1) at 5 < S/N < 10. The cumulative distribution function of the standard deviations of multiple RVs (Nobs. 8) for 678 standard stars reaches 0.45/0.54, 1.07/1.39, and 1.45/1.86 km s(-1) in the blue/red arm at the 50%, 90%, and 95% levels, respectively. Catalogs of the RVs, RVZPs, and selected candidate RV standard stars are available at https://github.com/hypergravity/paperdata.
DOI10.3847/1538-4365/ac0834
WOS Keyword6TH DATA RELEASE ; SPECTROSCOPIC SURVEY ; GAIA ; BINARIES ; ASTROPY ; GALAXY ; STARS
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000693409300001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/75499
Collection中国科学院国家天文台
Corresponding AuthorZhang, Bo
Affiliation1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100101, Peoples R China
4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
5.Peking Union Med Coll, Natl Canc Ctr, Beijing 100021, Peoples R China
6.Chinese Acad Med Sci, Beijing 100021, Peoples R China
7.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
8.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
9.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
10.China West Normal Univ, Phys & Space Sci Coll, Nanchong 637002, Peoples R China
11.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Bo,Li, Jiao,Yang, Fan,et al. Self-consistent Stellar Radial Velocities from LAMOST Medium-resolution Survey DR7[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2021,256(1):19.
APA Zhang, Bo.,Li, Jiao.,Yang, Fan.,Xiong, Jian-Ping.,Fu, Jian-Ning.,...&Hou, Yong-Hui.(2021).Self-consistent Stellar Radial Velocities from LAMOST Medium-resolution Survey DR7.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,256(1),19.
MLA Zhang, Bo,et al."Self-consistent Stellar Radial Velocities from LAMOST Medium-resolution Survey DR7".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 256.1(2021):19.
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