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Optical flare events on the RS Canum Venaticorum star UX Arietis
Cao DT(曹东涛)1,2,3; Gu SH(顾盛宏)1,2,3
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2017-06-01
Volume17Issue:6
DOI10.1088/1674-4527/17/6/55
Contribution Rank第1完成单位
Indexed BySCI
KeywordStars: Activity Stars: Chromospheres Stars: Binaries: Spectroscopic Stars: Flare Stars: Individual (Ux Ari)
Abstract

Based on long-term high-resolution spectroscopic observations obtained during five observing runs from 2001 to 2004, we study optical flare events and chromospheric activity variability of the very active RS CVn star UX Ari. By means of the spectral subtraction technique, several optical chromospheric activity indicators (including the He I D-3, Na I D-1, D-2 doublet, H alpha and Ca II IRT lines) covered in our echelle spectra were analyzed. Four large optical flare events were detected on UX Ari during our observations, which show prominent He I D-3 line emission together with great enhancement in emission of the H alpha and Ca II IRT lines and strong filled-in or emission reversal features in the Na I D-1, D-2 doublet lines. The newly detected flares are much more energetic than previous discoveries, especially for the flare identified during the 2002 December observing run. Optical flare events on UX Ari are more likely to be observed around two quadratures of the system, except for our optical flares detected during the 2004 November observing run. Moreover, we have found rotational modulation of chromospheric activity in the H alpha and Ca II IRT lines, which suggests the presence of chromospherically active longitudes over the surface of UX Ari. The change in chromospherically active longitudes among our observing runs, as well as the variation in chromospheric activity level from 2001 to 2004, indicates a long-term evolution of active regions.

Funding ProjectOpen Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China[10373023] ; National Natural Science Foundation of China[10773027] ; National Natural Science Foundation of China[11333006] ; Chinese Academy of Sciences project[KJCX2-YW-T24]
Funding OrganizationOpen Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China[10373023, 10773027, 11333006] ; Chinese Academy of Sciences project[KJCX2-YW-T24]
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000408362700007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordACTIVE BINARY-SYSTEMS ; SIMULTANEOUS H ALPHA ; CHROMOSPHERIC ACTIVITY ; II PEGASI ; ROTATIONAL MODULATION ; CLOSE BINARIES ; BV PHOTOMETRY ; IUE SPECTRA ; SZ-PISCIUM ; EMISSION
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/11925
Collection系外行星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorCao DT(曹东涛)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Cao DT,Gu SH. Optical flare events on the RS Canum Venaticorum star UX Arietis[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(6).
APA Cao DT,&Gu SH.(2017).Optical flare events on the RS Canum Venaticorum star UX Arietis.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(6).
MLA Cao DT,et al."Optical flare events on the RS Canum Venaticorum star UX Arietis".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.6(2017).
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