DBp.1.39 — A new Speckle Imager and speckle observations at SHAO

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Aug 4th at 6:00 PM until 6:00 PM




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Author(s): Yuanyuan Ding1, Kexin Li1, Zhendong Chen1

Institution(s): 1. Shanghai Astronomical Observatory,Chinese Academy of Sciences

Speckle interferometry is achieved by the integration of a series of short-exposure images of the object. It has been the method of choice for high-resolution observations of binary stars. It has yielded thousands of excellent angular separations and position angles. This technique can easily be actualized because it doesn’t need exploration and revision system for wavefront. So it is widely used in observational astronomy, especially for observing binary stars. Recently, the research shows that it also can provide high-resolution satellite image.
Speckle imaging of binary stars carried out by the research team of Shanghai Astronomical Observatory (SHAO) from 2006, and we have got some valuable results. With the increasing urbanization, the night sky background getting brighter at Sheshan area, the former speckle imager can't meet the needs of the observation experiment. In the years 2013–2014, a new speckle imager was developed at SHAO, we called it as NSIS. It is a speckle imaging system that use Ultra897 EMCCD as the image recording device. Short exposure images are recorded by this device at a 1.56-m telescope. Collimating lens and imaging lens are adopted for magnification, and the space between two lens can be changed which is set for the filter and Risley prisms or other future use. Construction of NSIS has been completed at SHAO, and more than twenty binary stars were observed in 2014. The results shows that the detection capability of the new imager is stronger than the original one. At present, the magnitude of the faintest star we observed is 7.67. In the future, we will observe more binary stars fainter than 8.
In this paper, we will give the description of system design and the observations of binary stars. , The image reconstruction and initial results will be presented too.