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Stellar activity with LAMOST - I. Spot configuration in Pleiades
Fang, Xiang-Song; Zhao, Gang; Zhao, Jing-Kun; Chen, Yu-Qin; Kumar, Yerra Bharat
2016-12-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号463期号:3页码:2494-2512
摘要We use the spectra of Pleiades and field stars from the LAMOST DR2 archive to study how spottedness and activity vary as a function of mass at young ages. We obtained the standard TiOband strength by measuring TiO bands near 7050 angstrom from LAMOST spectra (R approximate to 1800) for a large sample of field GKM dwarfs with solar metallicity. Analysis shows that active dwarfs, including those of late G and early K types, have extra TiO absorption compared to their inactive counterparts, indicating the presence of cool spots on their surface. Active late K and M dwarfs show deeper TiO2 and shallower TiO4 compared to inactive stars at a given TiO5, which could be partly explained through cool spots. We estimated the cool-spot fractional coverage for 304 Pleiades candidates by modelling their TiO2 (and TiO5) band strength with respect to the standard value. The results show that the surfaces of a large fraction of K-and M-type members have very large spot coverage (similar to 50 per cent). We analysed the correlation between spot coverage, rotation and the amplitude of light variation, and found spot coverage on slow rotators (R-o > 0.1) increases with decreasing Rossby number R-o. Interestingly, we detected a saturation-like feature for spot coverage in fast rotators with a saturation level of 40-50 per cent. In addition, the spot distribution in hotter fast rotators is more symmetrical compared to slow rotators. More interestingly, we detected a large spot coverage in many M-type members with no or little light variation. In the bigger picture, these results provide important constraints for the stellar dynamos of these cool active stars.
文章类型Article
关键词Stars: Activity Stars: Late-type Stars: Rotation Starspots
WOS标题词Science & Technology ; Physical Sciences
资助者National Key Basic Research Programme of China (973 programme)(2014CB845701 ; National Key Basic Research Programme of China (973 programme)(2014CB845701 ; National Natural Science Foundation of China(U1431106) ; National Natural Science Foundation of China(U1431106) ; Chinese Academy of Sciences(2013FFJB0008) ; Chinese Academy of Sciences(2013FFJB0008) ; National Development and Reform Commission ; National Development and Reform Commission ; 2014CB845703) ; 2014CB845703) ; National Key Basic Research Programme of China (973 programme)(2014CB845701 ; National Key Basic Research Programme of China (973 programme)(2014CB845701 ; National Natural Science Foundation of China(U1431106) ; National Natural Science Foundation of China(U1431106) ; Chinese Academy of Sciences(2013FFJB0008) ; Chinese Academy of Sciences(2013FFJB0008) ; National Development and Reform Commission ; National Development and Reform Commission ; 2014CB845703) ; 2014CB845703)
DOI10.1093/mnras/stw1923
关键词[WOS]LOW-MASS STARS ; DIGITAL SKY SURVEY ; MAIN-SEQUENCE STARS ; CLUSTER NGC 2516 ; M-DWARFS ; ROTATIONAL VELOCITIES ; SPECTROSCOPIC SURVEY ; MAGNETIC ACTIVITY ; DATA RELEASE ; II-PEGASI
收录类别SCI
语种英语
资助者National Key Basic Research Programme of China (973 programme)(2014CB845701 ; National Key Basic Research Programme of China (973 programme)(2014CB845701 ; National Natural Science Foundation of China(U1431106) ; National Natural Science Foundation of China(U1431106) ; Chinese Academy of Sciences(2013FFJB0008) ; Chinese Academy of Sciences(2013FFJB0008) ; National Development and Reform Commission ; National Development and Reform Commission ; 2014CB845703) ; 2014CB845703) ; National Key Basic Research Programme of China (973 programme)(2014CB845701 ; National Key Basic Research Programme of China (973 programme)(2014CB845701 ; National Natural Science Foundation of China(U1431106) ; National Natural Science Foundation of China(U1431106) ; Chinese Academy of Sciences(2013FFJB0008) ; Chinese Academy of Sciences(2013FFJB0008) ; National Development and Reform Commission ; National Development and Reform Commission ; 2014CB845703) ; 2014CB845703)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000393566000018
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8300
专题光学天文研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
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Fang, Xiang-Song,Zhao, Gang,Zhao, Jing-Kun,et al. Stellar activity with LAMOST - I. Spot configuration in Pleiades[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,463(3):2494-2512.
APA Fang, Xiang-Song,Zhao, Gang,Zhao, Jing-Kun,Chen, Yu-Qin,&Kumar, Yerra Bharat.(2016).Stellar activity with LAMOST - I. Spot configuration in Pleiades.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,463(3),2494-2512.
MLA Fang, Xiang-Song,et al."Stellar activity with LAMOST - I. Spot configuration in Pleiades".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 463.3(2016):2494-2512.
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