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Magnetic Activities of M-type Stars Based on LAMOST DR5 and Kepler and K2 Missions
Lu, Hong-peng1,2; Zhang, Li-yun1,2; Shi, Jianrong3; Han, Xianming L.1,4; Fan, Dongwei3; Long, Liu1; Pi, Qingfeng5
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2019-08-01
Volume243Issue:2Pages:20
DOI10.3847/1538-4365/ab2f8f
Indexed BySCI
Keywordstars: activity stars: chromospheres stars: flare stars: low-mass stars: rotation
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 (H alpha, H beta, H gamma, H delta, Ca II H&K, and He I D3). Using the Ha indicator, 40,464 spectra of 38,417 M stars show chromospheric activity, and 1791 of these 5499 M-type stars with repeated observations have H alpha 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 H alpha 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 H alpha equivalent width equal to 0.75 angstrom and using the rotation period equal to 10 days as the threshold for the M-type stellar flare time frequency are almost equivalent.

Funding ProjectJoint Fund of Astronomy of the NSFC[U1631236] ; Joint Fund of Astronomy of the NSFC[U1431114] ; Joint Fund of Astronomy of the CAS[U1631236] ; Joint Fund of Astronomy of the CAS[U1431114] ; NASA Science Mission Directorate ; NASA[NAS5-26555] ; NASA Office of Space Science[NNX13AC07G] ; National Development and Reform Commission
Funding OrganizationJoint Fund of Astronomy of the NSFC[U1631236, U1431114] ; Joint Fund of Astronomy of the CAS[U1631236, U1431114] ; NASA Science Mission Directorate ; NASA[NAS5-26555] ; NASA Office of Space Science[NNX13AC07G] ; National Development and Reform Commission
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0067-0049
URL查看原文
WOS IDWOS:000478953200001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordDIGITAL SKY SURVEY ; H-ALPHA EMISSION ; CA-II-H ; DATA RELEASE ; CHROMOSPHERIC ACTIVITY ; COOL STARS ; VARIABILITY ; FLARES ; TELESCOPE ; SEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/20808
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorZhang, Li-yun
Affiliation1.College of Physics & Guizhou Provincial Key Laboratory of Public Big Data, Guizhou University, Guiyang 550025, People's Republic of China
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
Recommended Citation
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]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2019,243(2):20.
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.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,243(2),20.
MLA Lu, Hong-peng,et al."Magnetic Activities of M-type Stars Based on LAMOST DR5 and Kepler and K2 Missions".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 243.2(2019):20.
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