An Extremely Low Mid-infrared Extinction Law toward the Galactic Center and 4% Distance Precision to 55 Classical Cepheids

doi:10.3847/1538-4357/aabfbc

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	An Extremely Low Mid-infrared Extinction Law toward the Galactic Center and 4% Distance Precision to 55 Classical Cepheids
	Chen,Xiaodian 1; Wang,Shu 2; Deng,Licai 1; de Grijs,Richard 2,3,4
刊名	The Astrophysical Journal
	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
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-859-2-AABFBC
内容类型	期刊论文
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).