redclumpstarsfromlamostiitheouterdiscofthemilkyway
文献类型：期刊论文
| 作者 | Wan Junchen ; Liu Chao; Deng Licai
|
| 刊名 | researchinastronomyandastrophysics
 |
| 出版日期 | 2017 |
| 卷号 | 17期号:8 |
| ISSN号 | 1674-4527 |
| 英文摘要 | We present stellar density maps of the Galactic outer disc with red clump stars from LAMOST data. These sainples are separated into younger (mean age similar to 2.7 Gyr) and older (mean age similar to 4.6 Gyr) populations so that they can trace the variation of structures with ages in the range of Galactocentric radius R from 9 to 13.5 kpc. We show that scale heights for both of the two populations increase with R and display radial gradients of 48 +/- 6 and 40 +/- 4 pc kpc(-1) for the older and younger populations, respectively. It is evident that flaring occurs in the thin disc populations with a wide range of ages. Moreover, the intensity of flaring does not seem to be significantly related to the age of the thin disc populations. On the other hand, scale lengths of the radial surface density profiles are 4.7 +/- 0.5 kpc for the younger population and 3.4 +/- 0.2 kpc for the older population, meaning that the younger disc population is more radially extended than the older one. Although the fraction of the younger population mildly increases from 28% at R similar to 9 to about 35% at R similar to 13 kpc, the older population is prominent with a fraction of no less than 65% in the outer disc. |
| 资助项目 | [National Key Basic Research Program of China] ; [National Natural Science Foundation of China] ; [National Development and Reform Commission] |
| 语种 | 英语 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/53110]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 中国科学院国家天文台 |
| 推荐引用方式 GB/T 7714 | Wan Junchen,Liu Chao,Deng Licai. redclumpstarsfromlamostiitheouterdiscofthemilkyway[J]. researchinastronomyandastrophysics,2017,17(8). |
| APA | Wan Junchen,Liu Chao,&Deng Licai.(2017).redclumpstarsfromlamostiitheouterdiscofthemilkyway.researchinastronomyandastrophysics,17(8). |
| MLA | Wan Junchen,et al."redclumpstarsfromlamostiitheouterdiscofthemilkyway".researchinastronomyandastrophysics 17.8(2017). |
入库方式： OAI收割
来源：国家天文台
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