nearbymsubdwarfsfromlamostdatarelease2
文献类型：期刊论文
| 作者 | Bai Yu1 ; Luo Ali1; Comte Georges2; Zhao Jingkun1; Yang Haifeng1; Guo Yanxin1; Wang Youfen1; Li Yinbi1; Du Bing1; Hou Wen1
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| 刊名 | researchinastronomyandastrophysics
 |
| 出版日期 | 2016 |
| 卷号 | 16期号:7页码:107_01 |
| ISSN号 | 1674-4527 |
| 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 Ti05 band systems. We also emphasize the use of the CaH1 band. We provide estimates of spectral subtype (SPT),Lepine metallicity index ζ, effective temperature and Fe/H. Both ζ-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 Hα emission line. The source LAMOST J104521.52+482823.3 is a white dwarf - M subdwarf binary, while LAMOST J 123045.52+410943.8, also active, exhibits carbon features in red. |
| 语种 | 英语 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/53368]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.中国科学院国家天文台 2.艾克斯-马赛大学 3.山东大学 4.中铁一局集团第五工程有限公司 |
| 推荐引用方式 GB/T 7714 | Bai Yu,Luo Ali,Comte Georges,et al. nearbymsubdwarfsfromlamostdatarelease2[J]. researchinastronomyandastrophysics,2016,16(7):107_01. |
| APA | Bai Yu.,Luo Ali.,Comte Georges.,Zhao Jingkun.,Yang Haifeng.,...&Zhang Yong.(2016).nearbymsubdwarfsfromlamostdatarelease2.researchinastronomyandastrophysics,16(7),107_01. |
| MLA | Bai Yu,et al."nearbymsubdwarfsfromlamostdatarelease2".researchinastronomyandastrophysics 16.7(2016):107_01. |
入库方式： OAI收割
来源：国家天文台
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