Nearby M subdwarfs from LAMOST data release 2
文献类型：期刊论文
| 作者 | Bai, Yu1,2 ; Luo, A-Li1; Comte, Georges3; Zhao, Jing-Kun1; Yang, Hai-Feng1,4; Guo, Yan-Xin1; Wang, You-Fen1; Li, Yin-Bi1; Du, Bing1; Hou, Wen1,2
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2016-07-01 |
| 卷号 | 16期号:7 |
| 关键词 | stars: late-type stars: statistics subdwarfs |
| 英文摘要 | We identify 108 M subdwarfs (sdMs) out of more than two hundred thousand M type spectra from the second data release (DR2) of the LAMOST regular survey. This sample, among which 58 members are identified for the first time, includes 33 extreme subdwarfs (esdMs) and 11 ultra subdwarfs (usdMs). The selection is based on the usual ratio of absorption depth of CaH2, CaH3 and TiO5 band systems. We also emphasize the use of the CaH1 band. We provide estimates of spectral subtype (SPT), Le pine metallicity index zeta, effective temperature and [Fe/H]. Both zeta-[Fe/H] and SPT-T-eff figures show reasonable consistency; compared to PHOENIX model spectra, average rounded values of [Fe/H] for sdMs, esdMs and usdMs are respectively -0.5, -1 and -1.5. The photometric distances are estimated, indicating that most sources are located within 500 pc of the Sun and 350 pc of the Galactic disk. Velocities and 3D Galactic motions are also briefly discussed. Among the 108 subdwarfs, seven stars appear to be active with a significant H-alpha emission line. The source LAMOST J104521.52+482823.3 is a white dwarf - M subdwarf binary, while LAMOST J123045.52+410943.8, also active, exhibits carbon features in red. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000379555500007 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5303]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Aix Marseille Univ, CNRS, Inst Pytheas, LAM,UMR 7326, F-13388 Marseille, France 4.Taiyuan Univ Sci & Technol, Sch Comp Sci & Technol, Taiyuan 030024, Peoples R China 5.Shandong Univ Weihai, Sch Mech Elect & Informat Engn, Weihai 264209, Peoples R China 6.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bai, Yu,Luo, A-Li,Comte, Georges,et al. Nearby M subdwarfs from LAMOST data release 2[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(7). |
| APA | Bai, Yu.,Luo, A-Li.,Comte, Georges.,Zhao, Jing-Kun.,Yang, Hai-Feng.,...&Zhang, Yong.(2016).Nearby M subdwarfs from LAMOST data release 2.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(7). |
| MLA | Bai, Yu,et al."Nearby M subdwarfs from LAMOST data release 2".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.7(2016). |
入库方式： OAI收割
来源：国家天文台
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