Magnetic Activities of M-type Stars Based on LAMOST DR5 and Kepler and K2 Missions

doi:10.3847/1538-4365/ab2f8f

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	Magnetic Activities of M-type Stars Based on LAMOST DR5 and Kepler and K2 Missions
	Lu,Hong-peng 1; Zhang,Li-yun 1,2; Shi,Jianrong 3; Han,Xianming L.1,4; Fan,Dongwei 3; Long,Liu 1; Pi,Qingfeng 5
刊名	The Astrophysical Journal Supplement Series
	2019-08-05
卷号	243 期号:2
关键词	stars: activity stars: chromospheres stars: flare stars: low-mass stars: rotation
ISSN号	0067-0049
DOI	10.3847/1538-4365/ab2f8f
英文摘要	Abstract We performed a statistical study of magnetic activities of M-type stars by combining the spectra of LAMOST DR5 with light curves from the Kepler and K2 missions. We mainly want to study the relationship between chromospheric activity and flares, and their relations of magnetic activity and rotation period. We have obtained the maximum catalog of 516,688 M-type stellar spectra of 480,912 M stars from LAMOST DR5 and calculated their equivalent widths of chromospheric activity indicators (Hα, Hβ, Hγ, Hδ, Ca ii H&K, and He i D3). Using the Hα indicator, 40,464 spectra of 38,417 M stars show chromospheric activity, and 1791 of these 5499 M-type stars with repeated observations have Hα variability. We used an automatic detection plus visual inspection method to detect 17,432 flares on 8964 M-type stars from the catalog by cross-matching LAMOST DR5 and the Kepler and K2 databases. We used the Lomb–Scargle method to calculate their rotation periods. We find that the flare frequency is consistent with the ratio of activities of these chromospheric activity indicators as a function of spectral type in M0–M3. We find the equivalent widths of Hα and Ca?ii H have a significant statistical correlation with the flare amplitude in M-type stars. We confirm that the stellar flare is affected by both the stellar magnetic activity and the rotation period. Finally, using the Hα equivalent width equal to 0.75 ? and using the rotation period equal to 10 days as the threshold for the M-type stellar flare time frequency are almost equivalent.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0067-0049-243-2-AB2F8F
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/27142]
专题	中国科学院国家天文台
作者单位	1.College of Physics & Guizhou Provincial Key Laboratory of Public Big Data, 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.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 4.Department of Physics and Astronomy, Butler University, Indianapolis, IN 46208, USA 5.Department of Astronomy, Beijing Normal University, Beijing, 100875, People’s Republic of China
推荐引用方式 GB/T 7714	Lu,Hong-peng,Zhang,Li-yun,Shi,Jianrong,et al. Magnetic Activities of M-type Stars Based on LAMOST DR5 and Kepler and K2 Missions[J]. The Astrophysical Journal Supplement Series,2019,243(2).
APA	Lu,Hong-peng.,Zhang,Li-yun.,Shi,Jianrong.,Han,Xianming L..,Fan,Dongwei.,...&Pi,Qingfeng.(2019).Magnetic Activities of M-type Stars Based on LAMOST DR5 and Kepler and K2 Missions.The Astrophysical Journal Supplement Series,243(2).
MLA	Lu,Hong-peng,et al."Magnetic Activities of M-type Stars Based on LAMOST DR5 and Kepler and K2 Missions".The Astrophysical Journal Supplement Series 243.2(2019).