An Extremely Low Mid-infrared Extinction Law toward the Galactic Center and 4% Distance Precision to 55 Classical Cepheids
文献类型：期刊论文
| 作者 | Chen,Xiaodian1; Wang,Shu2; Deng,Licai1 ; de Grijs,Richard2,3,4
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2018-06-01 |
| 卷号 | 859期号:2 |
| 关键词 | distance scale dust, extinction Galaxy: bulge Galaxy: center infrared: stars stars: variables: Cepheids |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aabfbc |
| 英文摘要 | Abstract Distances and extinction values are usually degenerate. To refine the distance to the general Galactic Center region, a carefully determined extinction law (taking into account the prevailing systematic errors) is urgently needed. We collected data for 55 classical Cepheids projected toward the Galactic Center region to derive the near- to mid-infrared extinction law using three different approaches. The relative extinction values obtained are , , , and . We also calculated the corresponding systematic errors. Compared with previous work, we report an extremely low and steep mid-infrared extinction law. Using a seven-passband “optimal distance” method, we improve the mean distance precision to our sample of 55 Cepheids to 4%. Based on four confirmed Galactic Center Cepheids, a solar Galactocentric distance of R0?=?8.10?±?0.19?±?0.22 kpc is determined, featuring an uncertainty that is close to the limiting distance accuracy (2.8%) for Galactic Center Cepheids. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-859-2-AABFBC |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/21735]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China; chenxiaodian@nao.cas.cn 2.Kavli Institute for Astronomy & Astrophysics, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, People’s Republic of China; shuwang@pku.edu.cn 3.International Space Science Institute—Beijing, 1 Nanertiao, Zhongguancun, Hai Dian District, Beijing 100190, People’s Republic of China 4.Department of Physics and Astronomy, Macquarie University, Balaclava Road, North Ryde, NSW 2109, Australia |
| 推荐引用方式 GB/T 7714 | Chen,Xiaodian,Wang,Shu,Deng,Licai,et al. An Extremely Low Mid-infrared Extinction Law toward the Galactic Center and 4% Distance Precision to 55 Classical Cepheids[J]. The Astrophysical Journal,2018,859(2). |
| APA | Chen,Xiaodian,Wang,Shu,Deng,Licai,&de Grijs,Richard.(2018).An Extremely Low Mid-infrared Extinction Law toward the Galactic Center and 4% Distance Precision to 55 Classical Cepheids.The Astrophysical Journal,859(2). |
| MLA | Chen,Xiaodian,et al."An Extremely Low Mid-infrared Extinction Law toward the Galactic Center and 4% Distance Precision to 55 Classical Cepheids".The Astrophysical Journal 859.2(2018). |
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来源：国家天文台
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