AN ORBIT FIT FOR THE GRILLMAIR DIONATOS COLD STELLAR STREAM
文献类型：期刊论文
| 作者 | Willett, Benjamin A.1; Newberg, Heidi Jo1; Zhang, Haotong2 ; Yanny, Brian; Beers, Timothy C.3,4
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2009-05-20 |
| 卷号 | 697期号:1页码:207-223 |
| 关键词 | Galaxy: kinematics and dynamics Galaxy: structure |
| 英文摘要 | We use velocity and metallicity information from Sloan Digital Sky Survey and Sloan Extension for Galactic Understanding and Exploration stellar spectroscopy to fit an orbit to the narrow 63 degrees stellar stream of Grillmair and Dionatos. The stars in the stream have a retrograde orbit with eccentricity e = 0.33 (perigalacticon of 14.4 kpc and apogalacticon of 28.7 kpc) and inclination approximately i similar to 35 degrees. In the region of the orbit which is detected, it has a distance of about 7-11 kpc from the Sun. Assuming a standard disk plus bulge and logarithmic halo potential for the Milky Way stars plus dark matter, the stream stars are moving with a large space velocity of approximately 276 km s(-1) at perigalacticon. Using this stream alone, we are unable to determine if the dark matter halo is oblate or prolate. The metallicity of the stream is [Fe/H] = -2.1 +/- 0.1. Observed proper motions for individual stream members above the main sequence turnoff are consistent with the derived orbit. None of the known globular clusters in the Milky Way have positions, radial velocities, and metallicities that are consistent with being the progenitor of the GD-1 stream. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000265764000018 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7482]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA 2.Natl Astron Observ, Beijing, Peoples R China 3.Michigan State Univ, Dept Phys & Astron, CSCE, E Lansing, MI 48824 USA 4.Michigan State Univ, JINA, E Lansing, MI 48824 USA |
| 推荐引用方式 GB/T 7714 | Willett, Benjamin A.,Newberg, Heidi Jo,Zhang, Haotong,et al. AN ORBIT FIT FOR THE GRILLMAIR DIONATOS COLD STELLAR STREAM[J]. ASTROPHYSICAL JOURNAL,2009,697(1):207-223. |
| APA | Willett, Benjamin A.,Newberg, Heidi Jo,Zhang, Haotong,Yanny, Brian,&Beers, Timothy C..(2009).AN ORBIT FIT FOR THE GRILLMAIR DIONATOS COLD STELLAR STREAM.ASTROPHYSICAL JOURNAL,697(1),207-223. |
| MLA | Willett, Benjamin A.,et al."AN ORBIT FIT FOR THE GRILLMAIR DIONATOS COLD STELLAR STREAM".ASTROPHYSICAL JOURNAL 697.1(2009):207-223. |
入库方式： OAI收割
来源：国家天文台
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