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Radio stars observed in the LAMOST spectral survey
Zhang, Li-Yun1; Yue, Qiang1; Lu, Hong-Peng1; Han, Xian-Ming L.1,2; Zhang, Yong3; Shi, Jian-Rong4; Wang, Yue-Fei3; Hou, Yong-Hui3; Cao, Zi-Huang4
2017-09-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume17Issue:10
AbstractRadio stars have attracted astronomers' attention for several decades. To better understand the physics behind stellar radio emissions, it is important to study their optical behaviors. The LAMOST survey provides a large database for researching stellar spectroscopic properties of radio stars. In this work, we concentrate on their spectroscopic properties and infer physical properties from their spectra, such as stellar activity and variability. We mined big data from the LAMOST spectral survey Data Release 2 (DR2), published on 2016 June 30, by cross-matching them with radio stars from FIRST and other surveys. We obtained 783 good stellar spectra with high signal to noise ratio for 659 stars. The criteria for selection were positional coincidence within 1.5 '' and LAMOST objects classified as stars. We calculated the equivalent widths (EWs) of the Ca II H&K, H delta, H gamma, H beta, H alpha and Ca II IRT lines by integrating the line profiles. Using the EWs of the H alpha line, we detected 147 active stellar spectra of 89 objects having emissions above the H alpha continuum. There were also 36 objects with repeated spectra, 28 of which showed chromospheric activity variability. Furthermore, we found 14 radio stars emitting noticeably in the Ca II IRT lines. The low value of the EW8542/EW8498 ratio for these 14 radio stars possibly alludes to chromospheric plage regions.
SubtypeArticle
KeywordStars: Chromosphere Stars: Activity Stars: Radio Stars: Spectroscopic
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNSFC(U1631236 ; NSFC(U1631236 ; Chinese Academy of Sciences (CAS)(U1631236 ; Chinese Academy of Sciences (CAS)(U1631236 ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Science Foundation ; National Science Foundation ; National Development and Reform Commission ; National Development and Reform Commission ; U1431114 ; U1431114 ; U1431114 ; U1431114 ; U1631109 ; U1631109 ; U1631109 ; U1631109 ; 11263001) ; 11263001) ; 11263001) ; 11263001) ; NSFC(U1631236 ; NSFC(U1631236 ; Chinese Academy of Sciences (CAS)(U1631236 ; Chinese Academy of Sciences (CAS)(U1631236 ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Science Foundation ; National Science Foundation ; National Development and Reform Commission ; National Development and Reform Commission ; U1431114 ; U1431114 ; U1431114 ; U1431114 ; U1631109 ; U1631109 ; U1631109 ; U1631109 ; 11263001) ; 11263001) ; 11263001) ; 11263001)
DOI10.1088/1674-4527/17/10/105
WOS KeywordDIGITAL SKY SURVEY ; MAIN-SEQUENCE STARS ; T-TAURI STARS ; CHROMOSPHERIC ACTIVITY ; MAGNETIC ACTIVITY ; TELESCOPE LAMOST ; ECHELLE SPECTRA ; EV-LACERTAE ; L-DWARFS ; X-RAY
Indexed BySCI
Language英语
Funding OrganizationNSFC(U1631236 ; NSFC(U1631236 ; Chinese Academy of Sciences (CAS)(U1631236 ; Chinese Academy of Sciences (CAS)(U1631236 ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Science Foundation ; National Science Foundation ; National Development and Reform Commission ; National Development and Reform Commission ; U1431114 ; U1431114 ; U1431114 ; U1431114 ; U1631109 ; U1631109 ; U1631109 ; U1631109 ; 11263001) ; 11263001) ; 11263001) ; 11263001) ; NSFC(U1631236 ; NSFC(U1631236 ; Chinese Academy of Sciences (CAS)(U1631236 ; Chinese Academy of Sciences (CAS)(U1631236 ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Science Foundation ; National Science Foundation ; National Development and Reform Commission ; National Development and Reform Commission ; U1431114 ; U1431114 ; U1431114 ; U1431114 ; U1631109 ; U1631109 ; U1631109 ; U1631109 ; 11263001) ; 11263001) ; 11263001) ; 11263001)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000415007500006
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20205
Collection光学天文研究部
Affiliation1.Guizhou Univ, Dept Phys & Astron, Coll Phys, Guiyang 550025, Guizhou, Peoples R China
2.Butler Univ, Dept Phys & Astron, Indianapolis, IN 46208 USA
3.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Li-Yun,Yue, Qiang,Lu, Hong-Peng,et al. Radio stars observed in the LAMOST spectral survey[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(10).
APA Zhang, Li-Yun.,Yue, Qiang.,Lu, Hong-Peng.,Han, Xian-Ming L..,Zhang, Yong.,...&Cao, Zi-Huang.(2017).Radio stars observed in the LAMOST spectral survey.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(10).
MLA Zhang, Li-Yun,et al."Radio stars observed in the LAMOST spectral survey".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.10(2017).
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