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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; Cao, Dong-Tao(Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China)
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2017-06-01
卷号17期号:6
DOI10.1088/1674-4527/17/6/55
产权排序第1完成单位
收录类别SCI
关键词Stars: Activity Stars: Chromospheres Stars: Binaries: Spectroscopic Stars: Flare Stars: Individual (Ux Ari)
摘要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.
项目资助者Open 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)
语种英语
学科领域天文学
文章类型Article
ISSN1674-4527
URL查看原文
WOS记录号WOS:000408362700007
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ACTIVE BINARY-SYSTEMS ; SIMULTANEOUS H ALPHA ; CHROMOSPHERIC ACTIVITY ; II PEGASI ; ROTATIONAL MODULATION ; CLOSE BINARIES ; BV PHOTOMETRY ; IUE SPECTRA ; SZ-PISCIUM ; EMISSION
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11925
专题系外行星研究组
中国科学院天体结构与演化重点实验室
通讯作者Cao, Dong-Tao(Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China)
作者单位1.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
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Cao DT,Gu SH,Cao, Dong-Tao. 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,&Cao, Dong-Tao.(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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