Flare-related plasma motions in the outer atmosphere of the RS CVn-type star II Peg

doi:10.1051/0004-6361/202450931

YNAO OpenIR > 系外行星研究组

	Flare-related plasma motions in the outer atmosphere of the RS CVn-type star II Peg
	曹东涛(1,2,3★); 顾盛宏(1,2,4★)
发表期刊	ASTRONOMY & ASTROPHYSICS
	2024-10-16
卷号	690
DOI	10.1051/0004-6361/202450931
产权排序	第1完成单位
收录类别	EI ; SCI
关键词	Sun: filaments, prominences stars: activity stars: coronae stars: flare stars: magnetic field
摘要	Analogous to solar flares, stellar flares are dramatic explosions in the atmosphere, which may be accompanied by prominence eruptions, coronal mass ejections (CMEs), and other forms of plasma motion. Based on time-resolved spectroscopic observations of the RS CVn-type star II Peg, we aim to search for the potential plasma motions associated with flares. In these observations, we detected part of the gradual decay phase of an optical flare, for which we find a lower limit on the energy of the H alpha line of 6.03 x 10(33) erg. Converting this H alpha energy, we find a bolometric white-light energy of 3.10 x 10(35) erg. Moreover, a secondary peak is also observed. After removing a quiescence reference, the H alpha residual shows an asymmetric behavior, including both a blueshifted and a redshifted emission component. The former component has a bulk velocity of about -180 km s(-1) and extends its velocity to more than -350 km s(-1). This phenomenon is likely caused by a prominence eruption event or a chromospheric evaporation process. The latter emission component has a bulk velocity of 130-70 km s(-1) and extends its velocity to nearly 400 km s(-1). We attribute the redshifted emission component to one or a combination of several possible scenarios: flare-driven coronal rain, chromospheric condensation, backward-directed prominence eruption close to the stellar limb, or falling material in a prominence eruption. The minimum masses of the moving plasmas resulting in the blueshifted and redshifted emission components are estimated to be 0.56 x 10(20) g and 1.74 x 10(20) g, respectively.
资助项目	Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences; National Natural Science Foundation of China (NSFC)[10373023]; National Natural Science Foundation of China (NSFC)[10773027]; National Natural Science Foundation of China (NSFC)[11333006]; National Natural Science Foundation of China (NSFC)[U1531121]; Yunnan Fundamental Research Projects[202201AT070186]; Yunnan Fundamental Research Projects[202305AS350009]; Yunnan Revitalization Talent Support Program (Young Talent Project); International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001]; China Manned Space Project
项目资助者	Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC)[10373023, 10773027, 11333006, U1531121] ; Yunnan Fundamental Research Projects[202201AT070186, 202305AS350009] ; Yunnan Revitalization Talent Support Program (Young Talent Project) ; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001] ; China Manned Space Project
语种	英语
学科领域	天文学 ; 恒星与银河系
文章类型	Article
出版者	EDP SCIENCES S A
出版地	17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN	0004-6361
URL	查看原文
WOS记录号	WOS:001334189800002
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	CORONAL MASS EJECTIONS ; MAIN-SEQUENCE STARS ; ALPHA LINE-PROFILES ; H-ALPHA ; CANUM-VENATICORUM ; X-RAY ; ROTATIONAL MODULATION ; OPTICAL OBSERVATIONS ; MAGNETIC ACTIVITY ; BINARY-SYSTEMS
EI入藏号	20244417284890
EI主题词	Stars
EI分类号	1301.2.3 - 1302.1.2 - 301.2.1 - 701.2 Magnetism: Basic Concepts and Phenomena
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/27645
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
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.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, China; 4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, China
推荐引用方式 GB/T 7714	Cao DT,Gu SH. Flare-related plasma motions in the outer atmosphere of the RS CVn-type star II Peg[J]. ASTRONOMY & ASTROPHYSICS,2024,690.
APA	曹东涛,&顾盛宏.(2024).Flare-related plasma motions in the outer atmosphere of the RS CVn-type star II Peg.ASTRONOMY & ASTROPHYSICS,690.
MLA	曹东涛,et al."Flare-related plasma motions in the outer atmosphere of the RS CVn-type star II Peg".ASTRONOMY & ASTROPHYSICS 690(2024).

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