Chromospheric activity properties and search for subdwarfs and extreme subdwarfs based on LAMOST stellar spectral survey
Zhang, Liyun1,2,3; Pi, Qingfeng1,2,3; Han, Xianming L.1,2,4; Shi, Jianrong5; Wang, Daimei1,2,3; Luo, Ali5; Zhang, Yong; Hou, Yonghui; Wang, Yuefei
发表期刊NEW ASTRONOMY
2016-04
卷号44页码:66-67
DOI10.1016/j.newast.2015.10.006
收录类别SCI
关键词Stars: Late-type Stars: Chromosphere Stars: Lamost Stars: Subdwarf
摘要

Big data obtained from a stellar spectroscopic survey carried out using the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST, also known as Guo Shou Jing telescope) provide important information for studying chromospheric activity, variability of chromospheric activity, and chromospheric statistical properties, and for searching subdwarfs and extreme subdwarfs. Using as chromospheric activity indicator the line, we detected 6391 active M stars among the 99741 stars in the M-star catalogue of the LAMOST survey. We also obtained the relationship between the fraction of active stars and the spectral types, which is consistent to previous results. We also studied the effects of activity on broadband photometric colors, and we did not see significant differences between active and inactive M stars. Using as spectroscopic molecular indicators the CaH123 and TiO5 lines, we found 1288 subdwarfs (including 120 active subdwarfs). We also found 15 extreme subdwarf (2 active extreme subdwarf) candidates. Our subdwarf candidates are slightly redder by about 0.05 mag in g-r compared with dwarfs using the g-r and r-i, and g-r and i-z color diagrams. Using our active M-star catalogue, we found that 898 stars exhibited 140 emission in at least two exposures (170 of them in at least three exposures). Among these 170 stars, 163 of them show variability in H-alpha, emission on long timescales (more than 2.5 h). Furthermore, 34 stars show variability over short timescales (less than 2.5 h), and 29 actives show variability over both short and long time scales.

资助项目NSFC[U1431114] ; NSFC[11263001] ; Natural Science Foundation for Young scientists from the Office of Education of GuiZhou Province[2014298] ; science and technology innovation team of Guizhou province[(2015)4017] ; National Development and Reform Commission ; National Development and Reform Commission. LAMOST
项目资助者NSFC[U1431114, 11263001] ; Natural Science Foundation for Young scientists from the Office of Education of GuiZhou Province[2014298] ; science and technology innovation team of Guizhou province[(2015)4017] ; National Development and Reform Commission ; National Development and Reform Commission. LAMOST
语种英语
学科领域天文学 ; 天体物理学 ; 实测天体物理学 ; 恒星与银河系 ; 恒星天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者ELSEVIER SCIENCE BV
出版地PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN1384-1076
URL查看原文
WOS记录号WOS:000366069900011
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]DIGITAL SKY SURVEY ; STAR SPECTROSCOPIC SURVEY ; H-ALPHA VARIABILITY ; SOUTHERN M DWARFS ; PILOT SURVEY ; DATA RELEASE ; MAGNETIC ACTIVITY ; LEGUE ; KINEMATICS ; TELESCOPE
引用统计
被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9385
专题中国科学院天体结构与演化重点实验室
通讯作者Zhang, Liyun
作者单位1.College of Science/Department of Physics & NAOC-GZU-Sponsored Center for Astronomy Research, Guizhou University, Guiyang 550025, PR China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, PR China
3.Dept. of Physics and Astronomy, Butler University, Indianapolis, IN 46208, USA
4.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
5.Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042, China
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Zhang, Liyun,Pi, Qingfeng,Han, Xianming L.,et al. Chromospheric activity properties and search for subdwarfs and extreme subdwarfs based on LAMOST stellar spectral survey[J]. NEW ASTRONOMY,2016,44:66-67.
APA Zhang, Liyun.,Pi, Qingfeng.,Han, Xianming L..,Shi, Jianrong.,Wang, Daimei.,...&Wang, Yuefei.(2016).Chromospheric activity properties and search for subdwarfs and extreme subdwarfs based on LAMOST stellar spectral survey.NEW ASTRONOMY,44,66-67.
MLA Zhang, Liyun,et al."Chromospheric activity properties and search for subdwarfs and extreme subdwarfs based on LAMOST stellar spectral survey".NEW ASTRONOMY 44(2016):66-67.
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