The Lives of Stars: Insights from the TGAS–RAVE–LAMOST Data Set
文献类型：期刊论文
| 作者 | Vickers,John J.; Smith,Martin C. |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2018-06-15 |
| 卷号 | 860期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Galaxy: disk Galaxy: evolution Galaxy: formation Galaxy: general Galaxy: kinematics and dynamics stars: kinematics and dynamics |
| DOI | 10.3847/1538-4357/aac323 |
| 英文摘要 | Abstract In this paper, we investigate how the chemical and kinematic properties of stars vary as a function of age. Using data from a variety of photometric, astrometric, and spectroscopic surveys, we calculate the ages, phase space information, and orbits for ～125,000 stars covering a wide range of stellar parameters. We find indications that the inner regions of the disk reached high levels of enrichment early, while the outer regions were more substantially enriched in intermediate and recent epochs. We consider these enrichment histories through comparison of the ages of stars, their metallicities, and kinematic properties, such as their angular momentum in the solar neighborhood (which is a proxy for orbital radius). We calculate rates at which the velocity dispersions evolve, investigate the Oort constants for populations of different ages (finding a slightly negative ?VC/?R and ?VR/?R for all ages, which is most negative for the oldest stars), as well as examine the behavior of the deviation angle of the velocity vertex as a function of age (which we find to fall from ～15° for the 2 Gyr old population to ～6° at around 6.5 Gyr of age, after which it remains unchanged). We find evidence for stellar churning, and find that the churned stars have a slightly younger age distribution than the rest of the data. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-860-2-AAC323 |
| 源URL | [http://119.78.226.72/handle/331011/32059]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China; johnjvickers@shao.ac.cn |
| 推荐引用方式 GB/T 7714 | Vickers,John J.,Smith,Martin C.. The Lives of Stars: Insights from the TGAS–RAVE–LAMOST Data Set[J]. The Astrophysical Journal,2018,860(2). |
| APA | Vickers,John J.,&Smith,Martin C..(2018).The Lives of Stars: Insights from the TGAS–RAVE–LAMOST Data Set.The Astrophysical Journal,860(2). |
| MLA | Vickers,John J.,et al."The Lives of Stars: Insights from the TGAS–RAVE–LAMOST Data Set".The Astrophysical Journal 860.2(2018). |
入库方式： OAI收割
来源：上海天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。