Doppler-shifted Signatures in the Chromospheric Line Profiles of II Pegasi
文献类型：期刊论文
| 作者 | Cao DT(曹东涛)1,2,4; Gu SH(顾盛宏)2,3,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2025-09-20 |
| 卷号 | 991期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/adf8eb |
| 产权排序 | 第1完成单位 |
| 文献子类 | Article |
| 英文摘要 | Stellar flares are frequently accompanied by prominence eruptions, coronal mass ejections (CMEs), and other forms of plasma motion. Based on the long-term high-resolution spectroscopic monitoring data set of the RS CVn-type star II Pegasi (II Peg), we search for stellar prominence eruptions and potential CMEs by investigating asymmetric signatures in the H alpha and H beta line profiles during the flare events. We observed seven optical flares with asymmetric spectral profiles, releasing low limit energies of 1033-1034 erg in the H alpha line. Five of these flares were associated with six potential CMEs, identified through the Doppler-shifted emission signatures in the chromospheric line profiles, particularly the H alpha line. The mass estimates for the CME candidates range from 1019 to 1020 g, while the kinetic energies are calculated to be around 1033-1034 erg. The most massive CME candidate was simultaneously recorded in the H alpha, H beta, and He i D3 lines. For II Peg, the possible flare-CME association rate is about 30%. There were also some redshifted excess absorption signatures in the H alpha line profiles. These signatures could not only be observed in the flaring spectra but also in the spectra without flare, which could be interpreted as features resulting from flare-driven coronal rain and quiescent rain, respectively. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| WOS关键词 | CORONAL MASS EJECTIONS ; RS-CANUM-VENATICORUM ; H-ALPHA LINE ; MULTIWAVELENGTH OPTICAL OBSERVATIONS ; ACTIVE BINARY-SYSTEMS ; MAIN-SEQUENCE STARS ; YZ CANIS MINORIS ; 2 M-DWARFS ; X-RAY ; ROTATIONAL MODULATION |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[10373023]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[10773027]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[U1531121]; National Natural Science Foundation of China; National Astronomical Observatories, Chinese Academy of Sciences[202201AT070186]; National Astronomical Observatories, Chinese Academy of Sciences[202305AS350009]; Yunnan Fundamental Research Projects; Yunnan Revitalization Talent Support Program (Young Talent Project)[202302AN360001]; International Centre of Supernovae, Yunnan Key Laboratory[CMS-CSST-2025-A15]; China Manned Space Program |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001572908000001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[10373023, 10773027, U1531121] ; National Natural Science Foundation of China ; National Astronomical Observatories, Chinese Academy of Sciences[202201AT070186, 202305AS350009] ; Yunnan Fundamental Research Projects ; Yunnan Revitalization Talent Support Program (Young Talent Project)[202302AN360001] ; International Centre of Supernovae, Yunnan Key Laboratory[CMS-CSST-2025-A15] ; China Manned Space Program |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28582]  |
| 专题 | 云南天文台_系外行星研究组 |
| 通讯作者 | Cao DT(曹东涛) |
| 作者单位 | 1.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, People’s Republic of China; 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; dtcao@ynao.ac.cn, shenghonggu@ynao.ac.cn; 3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, People’s Republic of China 4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; |
| 推荐引用方式 GB/T 7714 | Cao DT,Gu SH. Doppler-shifted Signatures in the Chromospheric Line Profiles of II Pegasi[J]. ASTROPHYSICAL JOURNAL,2025,991(1). |
| APA | 曹东涛,&顾盛宏.(2025).Doppler-shifted Signatures in the Chromospheric Line Profiles of II Pegasi.ASTROPHYSICAL JOURNAL,991(1). |
| MLA | 曹东涛,et al."Doppler-shifted Signatures in the Chromospheric Line Profiles of II Pegasi".ASTROPHYSICAL JOURNAL 991.1(2025). |
入库方式： OAI收割
来源：云南天文台
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