Flare Properties of A-type Stars in Kepler Data

doi:10.3847/1538-4357/abc479

	Flare Properties of A-type Stars in Kepler Data
	Bai, Jian-Ying 1,2; Esamdin, Ali 2
刊名	ASTROPHYSICAL JOURNAL
	2020-12-01
卷号	905 期号:2 页码:110
关键词	Stellar flares Optical flares Early-type stars A stars Catalogs
ISSN号	0004-637X
DOI	10.3847/1538-4357/abc479
产权排序	1
英文摘要	We analyzed the long-cadence (LC) light curves of 5435 stars with effective temperatures of 7000-10,500 K in Data Release 25 of Kepler to extend the samples of A-type flare stars and study their flare properties. A total of 103 flare stars are detected, of which 72 have the Large Sky Area Multi-Object fiber Spectroscopic Telescope spectral types, resulting in 51 A-type stars, including 17 new and 34 known. A total of 352 flares are detected from the 51 stars. The flare durations, amplitudes, and energies in the Kepler band are calculated, with medians of 2.5 hr, 2.1 mmag, and 10(35.8) erg, respectively. We give the flare frequency distribution (FFD) of the A-type stars. Within the same energy range, the flare rates of our FFD are lower than those in previous research, which was also based on Kepler LC data, and the FFD slope is consistent with that in the research. The activity-rotation relation of the A-type flare stars is shown for the first time, in which the flare activity decreases as the rotation period increases. The relation is similar to that of the late-type stars in previous studies. For the two relatively bright A-type flare stars, KIC 5360548 and KIC 9468475, three high-resolution spectra are observed on different nights for each of them, and radial velocities are calculated and compared with that of the previous research. The comparisons suggest that there is no evidence of the KIC 5360548 companion, and KIC 9468475 could have a low-mass companion.
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资助项目	National Natural Science Foundation of China[11873081] ; National Natural Science Foundation of China[U2031209]
WOS关键词	INITIAL CHARACTERISTICS ; SKY ; TELESCOPE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000600080300001
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/3805]
专题	新疆天文台_光学天文与技术应用研究室
通讯作者	Esamdin, Ali
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China
推荐引用方式 GB/T 7714	Bai, Jian-Ying,Esamdin, Ali. Flare Properties of A-type Stars in Kepler Data[J]. ASTROPHYSICAL JOURNAL,2020,905(2):110.
APA	Bai, Jian-Ying,&Esamdin, Ali.(2020).Flare Properties of A-type Stars in Kepler Data.ASTROPHYSICAL JOURNAL,905(2),110.
MLA	Bai, Jian-Ying,et al."Flare Properties of A-type Stars in Kepler Data".ASTROPHYSICAL JOURNAL 905.2(2020):110.