云南天文台高分辨率斑点成像的新进展

本文报道了对天文目标：双星ＡＤＳ１６８００、ＡＤＳ１６１７３，三星Ｈｕ６６（ＡＤＳ１１３４４）和Ｈｌｄ１７１（ＡＤＳ１６６４８）进行的斑点成像观测及测量结果。介绍了所用的二维光子计数斑点像探测系统的性能，分析了探测系统的光子噪声、附加噪声和其它更复杂的噪声对斑点图的平均功率谱和重谱的影响。在讨论了改正重谱中的噪声偏差项时提出了对重谱基底施加正性约束的算法。测量的结果表明，实现了高精度的微射受限天文

NEW PROGRESS IN THE HIGH RESOLUTION SPECKLE IMAGING AT YUNNAN OBSERVATORY

The speckle imaging observations of the binaries ADS16800, ADS16173 and the triple stars Hu66 (ADS11344), Hld171 (ADS16648) as well as the results of measurements are presented in this paper. At first the characterishcs of a new 2-dimensional photon counting speckle image detecting system used in observation are introduced. Then the influence on the average power spectrum and bispectrum of specklegrams caused by the photon noise, additive noise and more complex noises of other kinds in the detecting system are analyzed. In order to overcome the noise bias terms in the bispectrum, a method that adds a posihve restrichon on the base of the bispectrum has been proposed. The results of measurements show that high precision diffraction-limited astronomical speckle imaging can be achieved by mis method and some fine results of observation have been obtained.