Kinematics and Dynamics of the Galactic Halo from RR Lyrae Variable Stars
文献类型：期刊论文
| 作者 | Utkin, N. D.2,3; Dambis, A. K.3; Rastorguev, A. S.2,3; Klinchev, A. D.2; Ablimit, I.1,4; Zhao, G.4 |
| 刊名 | ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS
 |
| 出版日期 | 2018-11-01 |
| 卷号 | 44期号:11页码:688-698 |
| 关键词 | methods data analysis galaxies kinematics |
| ISSN号 | 1063-7737 |
| DOI | 10.1134/S1063773718110075 |
| 英文摘要 | Based on a sample of RR Lyrae variable stars including more than 9000 objects with proper motions and distances, we have investigated the kinematics of the Galactic halo from the two-dimensional velocity field. We have used both the proper motions deduced independently by us from the positional data taken from all-sky catalogues in a time interval up to 65 years and the proper motions taken from the Gaia DR2 catalogue. In addition, we have also studied the halo kinematics from the three-dimensional velocity field of similar to 850 RR Lyrae variables with distances, proper motions, and line-of-sight velocities. The kinematic parameters describing the velocity field have been estimated by the maximum-likelihood method; their change with Galactocentric distance has been investigated. The radial velocity dispersion in spherical coordinates sigma(r) approximate to 160-170 km s(-1) exceeds its values from previous papers approximately by 20 km s(-1), while the anisotropy parameter beta approximate to 0.68-0.72 agrees satisfactorily with previous studies. When estimating the rotation velocity of the population of RR Lyrae stars, we identified the inner and outer halos with weak prograde and retrograde rotations, respectively. |
| WOS关键词 | MILKY-WAY ; GLOBULAR-CLUSTERS ; PROPER MOTION ; RELATIVE AGES ; STELLAR HALO ; CATALOG ; GALAXY |
| 资助项目 | Russian Foundation for Basic Research[18-02-00890] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000450510600004 |
| 出版者 | PLEIADES PUBLISHING INC |
| 资助机构 | Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/23393]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Utkin, N. D. |
| 作者单位 | 1.Kyoto Univ, Kyoto, Japan 2.Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia 3.Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Univ Ski Pr 13, Moscow 119992, Russia 4.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Utkin, N. D.,Dambis, A. K.,Rastorguev, A. S.,et al. Kinematics and Dynamics of the Galactic Halo from RR Lyrae Variable Stars[J]. ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS,2018,44(11):688-698. |
| APA | Utkin, N. D.,Dambis, A. K.,Rastorguev, A. S.,Klinchev, A. D.,Ablimit, I.,&Zhao, G..(2018).Kinematics and Dynamics of the Galactic Halo from RR Lyrae Variable Stars.ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS,44(11),688-698. |
| MLA | Utkin, N. D.,et al."Kinematics and Dynamics of the Galactic Halo from RR Lyrae Variable Stars".ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS 44.11(2018):688-698. |
入库方式： OAI收割
来源：国家天文台
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