Chromospheric activity properties and search for subdwarfs and extreme subdwarfs based on LAMOST stellar spectral survey

CORC > 云南天文台 > 中国科学院云南天文台 > 中国科学院天体结构与演化重点实验室

	Chromospheric activity properties and search for subdwarfs and extreme subdwarfs based on LAMOST stellar spectral survey
	Zhang, Liyun1,2,3 ; Pi, Qingfeng 1,2,3; Han, Xianming L.1,2,4; Shi, Jianrong 5; Wang, Daimei 1,2,3; Luo, Ali 5; Zhang, Yong ; Hou, Yonghui ; Wang, Yuefei
刊名	NEW ASTRONOMY
	2016-04
卷号	44 页码:66-67
关键词	Stars: late-type Stars: chromosphere Stars: LAMOST Stars: subdwarf
ISSN号	1384-1076
通讯作者	Zhang, LY (reprint author), Guizhou Univ, Coll Sci, Dept Phys, Guiyang 550025, Peoples R China.
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	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
收录类别	SCI
原文出处	http://www.sciencedirect.com/science/article/pii/S1384107615001268
语种	英语
WOS记录号	WOS:000366069900011
公开日期	2016-06-01
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/9385]
专题	云南天文台_中国科学院天体结构与演化重点实验室
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
推荐引用方式 GB/T 7714	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.