用CSTAR进行离焦观测的差分图像分析
Difference Image Analysis of Defocused Observations with CSTAR
摘要：
中国小望远镜ARray（CSTAR）在2008年、2009年和2010年南极冬季期间进行了以南天极为中心的27平方度的高节奏时间序列观测。2008年和2010年i波段图像的光圈测光导致发现了200多颗变星。2009年冬季，每年的维修使阵列失去了焦点，在此期间，系统还遭受了间歇性结霜和电力故障。尽管存在这些技术问题，但使用g，r和clear滤镜获得了近80万张有用的图像。我们开发了一种差分成像和孔径测光的组合，以补偿高度拥挤，混合和散焦的帧。我们提出了这种方法的细节，这可能是有用的时间序列数据从其他小口径望远镜的分析，无论其图像质量。使用这种方法，我们能够恢复68个先前已知的变量，并检测到37个额外对象的变化。我们还确定了在2009年冬季的观测统计数据圆顶A，我们发现，由于云的灭绝是小于0.1和0.4等的40%和63%的黑暗时间，分别。
英文摘要：
The Chinese Small Telescope ARray (CSTAR) carried out high-cadence time-series observations of 27 square degrees centered on the South Celestial Pole during the Antarctic winter seasons of 2008, 2009 and 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 & 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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
