Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VII. The Stellar Disk Structure Revealed by the Mono-abundance Populations
文献类型：期刊论文
| 作者 | Yu,Zheng4; Li,Ji4; Chen,Bingqiu6; Huang,Yang6; Jia,Shuhua4; Xiang,Maosheng1; Yuan,Haibo7; Shi,Jianrong2,3; Wang,Chun5; Liu,Xiaowei6 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-05-01 |
| 卷号 | 912期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Galaxy disks Galaxy evolution Galaxy structure Galaxy abundances |
| DOI | 10.3847/1538-4357/abf098 |
| 英文摘要 | Abstract Using a sample of 96,201 primary red clump stars selected from the LAMOST and Gaia surveys, we investigate the stellar structure of the Galactic disk. The sample stars show two separated sequences of high-[α/Fe] and low-[α/Fe] in the [α/Fe]–[Fe/H] plane. We divide the sample stars into five mono-abundance populations (MAPs) with different ranges of [α/Fe] and [Fe/H], named as the high-[α/Fe], high-[α/Fe] and high-[Fe/H], low-[Fe/H], solar, high-[Fe/H] MAPs, respectively. We present the stellar number density distributions in the R–Z plane, and the scale heights and scale lengths of the individual MAPs by fitting their vertical and radial density profiles. The vertical profiles, the variation trend of scale height with the Galactocentric radius, indicate that there is a clear disk flare in the outer disk both for the low-[α/Fe] and the high-[α/Fe] MAPs. While the radial surface-density profiles show a peak radius of 7 kpc and 8 kpc for the high-[α/Fe] and low-[α/Fe] MAPs, respectively. We also investigate the correlation between the mean rotation velocity and metallicity of the individual MAPs, and find that the mean rotation velocities are well separated and show different trends between the high-[α/Fe] and the low-[α/Fe] MAPs. Finally, we discuss the character of the high-[α/Fe] and high-[Fe/H] MAP and find that it is more similar to the high-[α/Fe] MAP either in the radial and vertical density profiles or in the rotation velocity. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-912-2-ABF098 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/58591]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Li,Ji |
| 作者单位 | 1.Max-Planck Institute for Astronomy, Konigstuhl, D-69117, Heidelberg, Germany 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, People’s Republic of China 3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 4.College of Physics, Hebei Normal University, Shijiazhuang 050024, People’s Republic of China; liji@hebtu.edu.cn 5.Tianjin Astrophysics Center, Tianjin Normal University, Tianjin 300387, People’s Republic of China 6.South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, People’s Republic of China 7.Department of Astronomy, Beijing Normal University, Beijing 100875, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Yu,Zheng,Li,Ji,Chen,Bingqiu,et al. Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VII. The Stellar Disk Structure Revealed by the Mono-abundance Populations[J]. The Astrophysical Journal,2021,912(2). |
| APA | Yu,Zheng.,Li,Ji.,Chen,Bingqiu.,Huang,Yang.,Jia,Shuhua.,...&Liu,Xiaowei.(2021).Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VII. The Stellar Disk Structure Revealed by the Mono-abundance Populations.The Astrophysical Journal,912(2). |
| MLA | Yu,Zheng,et al."Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VII. The Stellar Disk Structure Revealed by the Mono-abundance Populations".The Astrophysical Journal 912.2(2021). |
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来源：国家天文台
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