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Magnetic Activity of TESS Objects Observed in the LAMOST Medium-resolution Spectral Survey

文献类型：期刊论文

作者Su, Tianhao1; Zhang, Li-yun1,7; Misra, Prabhakar6; Han, Xianming L.1,5; Wang, Yinpeng1; Li, Wenjie1; Zhu, Zhongzhong4; Pi, Qingfeng3; Lu, Hongpeng2
刊名ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期2025-02-01
卷号276期号:2
ISSN号0067-0049
DOI10.3847/1538-4365/ad97bb
文献子类Article
英文摘要A combination of spectroscopic and photometric observations provides an excellent data sample for studying stellar chromospheric activity. We have combined LAMOST medium-resolution spectra with TESS 2 minute light curves and extracted over 530,000 spectra and 110,000 light curves from more than 40,000 stars. We have quantified the H alpha line intensity in each spectrum and found that 38,659 spectra from 7002 stars exhibited excess H alpha emission and that the intensity of stellar chromospheric activity increases with later spectral types. We also discovered that the boundary value between the saturated and unsaturated regions of chromospheric activity for different spectral type stars is around Ro = 0.1. By analyzing the TESS light curves, we identified 31,539 flare events from 4120 stars. Through these flare events, we determined that the flare-frequency proportion of stars increases with later spectral types. We have found that the power-law index of the flare-frequency distribution for F-, G-, K-, and M-type stars is around 2.0, while that for A-type stars is 1.3. Additionally, we observed that the amplitude of brightness variations caused by modulation due to starspot coverage (Reff) is positively correlated with both the flare intensity and intensity of chromospheric activity and that the chromospheric activity was generally stronger in flare stars as compared to nonflare stars. We also found that within 300 pc, the proportion of chromospherically active stars and flare stars decreases with increasing distance from the Galactic disk. Finally, we discovered six flare events from the H alpha variation and estimated their energies.
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DIGITAL SKY SURVEY ; ACTIVITY-ROTATION RELATIONSHIP ; STAR SPECTROSCOPIC SURVEY ; K EMISSION DISTRIBUTION ; H-ALPHA EMISSION ; SOLAR-TYPE STARS ; LOW-MASS STARS ; CHROMOSPHERIC ACTIVITY ; M-DWARFS ; STELLAR-ACTIVITY
资助项目MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12373032]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[11963002]; National Natural Science Foundation of China (NSFC)[CMSCSST-2021-B07]; China Manned Space Project; Talent Program of the Guizhou Science and Technology Cooperation Platform ZDSYS; Chinese Academy of Sciences
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001397507100001
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[12373032, 11963002] ; National Natural Science Foundation of China (NSFC)[CMSCSST-2021-B07] ; China Manned Space Project[[2023]003] ; Talent Program of the Guizhou Science and Technology Cooperation Platform ZDSYS ; Chinese Academy of Sciences
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28000]  
专题云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.College of Physics, Guizhou University, Guiyang 550025, People's Republic of China; liy_zhang@hotmail.com;
2.State Key Laboratory of Public Big Data, Guizhou University, Guiyang 550025, People's Republic of China
3.School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, People's Republic of China;
4.College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, People's Republic of China;
5.Dept. of Physics and Astronomy and SARA, Butler University, Indianapolis, IN 46208, USA;
6.Department of Physics & Astronomy, Howard University, Washington, DC 20059, USA;
7.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People's Republic of China;
推荐引用方式
GB/T 7714		 Su, Tianhao,Zhang, Li-yun,Misra, Prabhakar,et al. Magnetic Activity of TESS Objects Observed in the LAMOST Medium-resolution Spectral Survey[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2025,276(2).
APA Su, Tianhao.,Zhang, Li-yun.,Misra, Prabhakar.,Han, Xianming L..,Wang, Yinpeng.,...&Lu, Hongpeng.(2025).Magnetic Activity of TESS Objects Observed in the LAMOST Medium-resolution Spectral Survey.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,276(2).
MLA Su, Tianhao,et al."Magnetic Activity of TESS Objects Observed in the LAMOST Medium-resolution Spectral Survey".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 276.2(2025).

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