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 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018-06-20 |
| 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 | 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 similar to 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 partial derivative V-C/partial derivative R and partial derivative V-R/partial derivative 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 similar to 15 degrees for the 2 Gyr old population to similar to 6 degrees 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. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000435374600005 |
| 源URL | [http://119.78.226.72/handle/331011/32285]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Vickers, John J. |
| 作者单位 | Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China |
| 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]. 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.ASTROPHYSICAL JOURNAL,860(2). |
| MLA | Vickers, John J.,et al."The Lives of Stars: Insights from the TGAS-RAVE-LAMOST Data Set".ASTROPHYSICAL JOURNAL 860.2(2018). |
入库方式： OAI收割
来源：上海天文台
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