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题名: DIFFERENCE IMAGE ANALYSIS OF DEFOCUSED OBSERVATIONS WITH CSTAR
作者: Oelkers, Ryan J.1; Macri, Lucas M.1; Wang LiFan(王力帆)1, 2, 3; Ashley, Michael C. B.4; Cui, Xiangqun3, 5; Feng LongLong(冯珑珑)2, 3; Gong, Xuefei3, 5; Lawrence, Jon S.4, 6; Qiang, Liu3, 7; Luong-Van, Daniel4; Pennypacker, Carl R.8; Yang, Huigen3, 9; Yuan, Xiangyan3, 5; York, Donald G.10; Zhou, Xu3, 7; Zhu ZhenXi(朱镇熹)2, 3
刊名: ASTRONOMICAL JOURNAL
出版日期: 2015-02-01
卷号: 149, 期号:2, 页码:50
关键词: methods: data analysis ; stars: variables: general
学科分类: 天文和天体物理
DOI: 10.1088/0004-256/149/2/50
文章类型: Article
英文摘要: The Chinese Small Telescope ARray carried out high-cadence time-series observations of 27 square degrees centered on the South Celestial Pole during the Antarctic winter seasons of 2008-2010. Aperture photometry of the 2008 and 2010 i-band images resulted in the discovery of over 200 variable stars. Yearly servicing left the array defocused for the 2009 winter season, during which the system also suffered from intermittent frosting and power failures. Despite these technical issues, nearly 800,000 useful images were obtained using g, r, and clear filters. We developed a combination of difference imaging and aperture photometry to compensate for the highly crowded, blended, and defocused frames. We present details of this approach, which may be useful for the analysis of time-series data from other small-aperture telescopes regardless of their image quality. Using this approach, we were able to recover 68 previously known variables and detected variability in 37 additional objects. We also have determined the observing statistics for Dome A during the 2009 winter season; we find the extinction due to clouds to be less than 0.1 and 0.4 mag for 40% and 63% of the dark time, respectively.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: VARIABLE-STARS ; SPACED DATA ; PHOTOMETRY ; ANTARCTICA ; DOME ; TELESCOPE ; SUBTRACTION ; PRECISION
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000349360200015
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14893
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Texas A&M Univ, Dept Phys & Astron, George P & Cynthiya W Mitchell Inst Fundamental, College Stn, TX 77843 USA
2.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China
3.Chinese Ctr Antarct Astron, Nanjing, Peoples R China
4.Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia
5.Nanjing Inst Astron Optic & Technol, Nanjing, Peoples R China
6.Australian Astron Observ, Epping, NSW, Australia
7.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
8.Inst Nucl & Particle Astrophys, Lawrence Berkeley Natl Lab, Berkeley, CA USA
9.Polar Res Inst China, Shanghai, Peoples R China
10.Univ Chicago, Enrico Fermi Inst, Dept Astron & Astrophys, Chicago, IL 60637 USA
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