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X-ray stars observed in LAMOST spectral survey
Lu, Hong-peng1,2,3; Zhang, Li-yun1,2,3; Han, Xianming L.1,3,4; Shi, Jianrong5
Source PublicationASTROPHYSICS AND SPACE SCIENCE
2018-05-01
Volume363Issue:5
DOI10.1007/s10509-018-3328-8
Indexed BySCI
KeywordStars: Chromospheres Stars: Activity Stars: X-ray Stars: Spectroscopic
Abstract

X-ray stars have been studied since the beginning of X-ray astronomy. Investigating and studying the chromospheric activity from X-ray stellar optical spectra is highly significant in providing insights into stellar magnetic activity. The big data of LAMOST survey provides an opportunity for researching stellar optical spectroscopic properties of X-ray stars. We inferred the physical properties of X-ray stellar sources from the analysis of LAMOST spectra. First, we cross-matched the X-ray stellar catalogue (12254 X-ray stars) from ARXA with LAMOST data release 3 (DR3), and obtained 984 good spectra from 713 X-ray sources. We then visually inspected and assigned spectral type to each spectrum and calculated the equivalent width (EW) of Ha line using the Hammer spectral typing facility. Based on the EW of H alpha line, we found 203 spectra of 145 X-ray sources with H alpha emission above the continuum. For these spectra we also measured the EWs of H beta, H gamma, H delta and Ca II IRT lines of these spectra. After removing novae, planetary nebulae and OB-type stars, we found there are 127 X-ray late-type stars with Ha line emission. By using our spectra and results from the literature, we found 53 X-ray stars showing H alpha variability; these objects are Classical T Tauri stars (CTTs), cataclysmic variables (CVs) or chromospheric activity stars. We also found 18 X-ray stars showing obvious emissions in the Ca II IRT lines. Of the 18 X-ray stars, 16 are CTTs and 2 are CVs. Finally, we discussed the relationships between the EW of Ha line and X-ray flux.

Funding ProjectNational Development and Reform Commission ; NSFC[U1631236] ; NSFC[U1431114] ; NSFC[11263001] ; Chinese Academy of Sciences (CAS)[U1631236] ; Chinese Academy of Sciences (CAS)[U1431114] ; Chinese Academy of Sciences (CAS)[11263001] ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories[KLSA201806]
Funding OrganizationNational Development and Reform Commission ; NSFC[U1631236, U1431114, 11263001] ; Chinese Academy of Sciences (CAS)[U1631236, U1431114, 11263001] ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories[KLSA201806]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherSPRINGER
Publication PlaceVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN0004-640X
URL查看原文
WOS IDWOS:000431355300024
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordT-TAURI STARS ; MAIN-SEQUENCE STARS ; HIGH-RESOLUTION SPECTROSCOPY ; EMISSION-LINE STARS ; DIGITAL SKY SURVEY ; NORTH GALACTIC POLE ; CATACLYSMIC VARIABLE CANDIDATES ; BRIGHT SOURCE CATALOG ; HERBIG AE/BE STARS ; AURIGA DARK CLOUDS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12362
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorZhang, Li-yun
Affiliation1.College of Physics/Department of Physics and Astronomy &
2.CAS Key Laboratory of Solar Activity, National Astronomical
3.Key Laboratory for the Structure and Evolution of Celestial
4.Dept. of Physics and Astronomy, Butler University, Indianapolis,
5.National Astronomical Observatories, Chinese Academy of
Recommended Citation
GB/T 7714
Lu, Hong-peng,Zhang, Li-yun,Han, Xianming L.,et al. X-ray stars observed in LAMOST spectral survey[J]. ASTROPHYSICS AND SPACE SCIENCE,2018,363(5).
APA Lu, Hong-peng,Zhang, Li-yun,Han, Xianming L.,&Shi, Jianrong.(2018).X-ray stars observed in LAMOST spectral survey.ASTROPHYSICS AND SPACE SCIENCE,363(5).
MLA Lu, Hong-peng,et al."X-ray stars observed in LAMOST spectral survey".ASTROPHYSICS AND SPACE SCIENCE 363.5(2018).
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