Magnetic Activity in X-Ray Stars from eROSITA: Insights from the TESS and LAMOST Surveys
文献类型：期刊论文
| 作者 | Xu, Lulu1; Zhang, Li-yun1,2; Wang, Yinpeng1; Su, Tianhao1; Han, Xianming L.1,3; Pires, Adriana M.4,5; Guo, Rui6; Zhang, Xian1; Misra, Prabhakar7; Pi, Qingfeng8 |
| 刊名 | ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
 |
| 出版日期 | 2026-06-01 |
| 卷号 | 284期号:2 |
| ISSN号 | 0067-0049 |
| DOI | 10.3847/1538-4365/ae5d2d |
| 文献子类 | Article |
| 英文摘要 | We have focused on investigating X-ray stars obtained from eROSITA Data Release 1 (eRASS1) and conducting crossmatching with the TESS and LAMOST surveys. We have employed a convolutional neural network to identify flares from TESS, and found 7229 flare events on 1430 stars, with over 95% having durations less than 2 hr, and with more than 68% having amplitudes concentrated between 0.001 and 0.01. The majority of flare stars are found to have effective temperatures below 4000 K, with most occurring on stars with masses below 1 M circle dot. The flare occurrence percentage is higher for stars with a temperature of less than 4000 K and a rotation period of less than 4 days. The flare duration is related to its energy by the formulation tau proportional to E0.27-0.41. We have obtained the value of the power-law index (alpha approximately 1.51 +/- 0.12) of the cumulative flare frequency distribution. Crossmatching the eROSITA X-ray star sample with the LAMOST DR11 data yielded 9907 low-resolution spectra for 7672 stars and 70244 medium-resolution spectra for 7233 stars. In medium-resolution spectra, an asymmetry was observed in the H alpha profile of source 1eRASS J052919.0+120930, and potentially attributed to coronal rain or chromospheric condensation. By studying stars identified through crossmatching eROSITA and TESS with LAMOST DR11, we investigate the multiwavelength properties of X-ray-emitting stars. We find that flare stars, mostly late-type, exhibit stronger chromospheric and coronal activity than nonflare stars, and that the LX/Lbol-Rossby number relation follows a broken power law with a turning point at R0 approximate to 0.1, indicating a transition from saturated to declining X-ray activity. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | MEDIUM-SENSITIVITY SURVEY ; ALPHA LINE-PROFILES ; WHITE-LIGHT FLARES ; DIGITAL SKY SURVEY ; M DWARFS ; STELLAR FLARES ; DATA RELEASE ; COOL STARS ; CHROMOSPHERIC ACTIVITY ; KEPLER |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)[11963002] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001770383600001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC)[11963002] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29235]  |
| 专题 | 云南天文台_中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Zhang, Li-yun |
| 作者单位 | 1.College of Physics, Guizhou University, Guiyang 550025, People’s Republic of China; liy_zhang@hotmail.com; 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China; 3.Dept. of Physics and Astronomy and SARA, Butler University, Indianapolis, IN 46208, USA; 4.Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany; 5.Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, 99 West Lincheng Rd., Guiyang 550051, People’s Republic of China; 6.College of Foreign Languages, Guizhou University, Guiyang 550025, People’s Republic of China; 7.Department of Physics & Astronomy, Howard University, Washington, DC 20059, USA; 8.School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, People’s Republic of China; 9.State Key Laboratory of Public Big Data, Guizhou University, Guiyang 550025, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Xu, Lulu,Zhang, Li-yun,Wang, Yinpeng,et al. Magnetic Activity in X-Ray Stars from eROSITA: Insights from the TESS and LAMOST Surveys[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2026,284(2). |
| APA | Xu, Lulu.,Zhang, Li-yun.,Wang, Yinpeng.,Su, Tianhao.,Han, Xianming L..,...&Lu, Hongpeng.(2026).Magnetic Activity in X-Ray Stars from eROSITA: Insights from the TESS and LAMOST Surveys.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,284(2). |
| MLA | Xu, Lulu,et al."Magnetic Activity in X-Ray Stars from eROSITA: Insights from the TESS and LAMOST Surveys".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 284.2(2026). |
入库方式： OAI收割
来源：云南天文台
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