Chromospheric activity properties and search for subdwarfs and extreme subdwarfs based on LAMOST stellar spectral survey
文献类型：期刊论文
| 作者 | Zhang, Liyun1,2,3; Pi, Qingfeng1,2,3; Han, Xianming L.1,2,4; Shi, Jianrong5 ; Wang, Daimei1,2,3; Luo, Ali5; Zhang, Yong6; Hou, Yonghui6; Wang, Yuefei6
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| 刊名 | NEW ASTRONOMY
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| 出版日期 | 2016-04-01 |
| 卷号 | 44页码:66-77 |
| 关键词 | Stars: late-type Stars: chromosphere Stars: LAMOST Stars: subdwarf |
| 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. (C) 2015 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000366069900011 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5514]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Guizhou Univ, Coll Sci, Dept Phys, Guiyang 550025, Peoples R China 2.Guizhou Univ, NAOC GZU Sponsored Ctr Astron Res, Guiyang 550025, Peoples R China 3.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China 4.Butler Univ, Dept Phys & Astron, Indianapolis, IN 46208 USA 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 6.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R 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,2016,44:66-77. |
| 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,44,66-77. |
| 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):66-77. |
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来源：国家天文台
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