Charge conservation and CCD aperture photometry |
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| Institution: | 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 2000, China;2. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China;1. CAS Key Lab of Network Data Science and Technology, Institute of Computing Technology, Chinese Academy of Sciences, 100190, Beijing, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China |
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| Abstract: | The Lick Observatory's CCD controller is a new type controller. It has the ability to exchange MPP (Multi-pinned phase) mode and normal operation within one CCD system. There are at least 4 CCD cameras using this type of controller in China since 2002. The weakness of this controller is that blooming occurs before nonlinearity and long before saturation. However, although it is no good for observation of bright extended sources and for constructing the point spread function from observing bright stars, aperture photometry of bright point sources (stars) is still feasible due to the principle of charge conservation. This point is confirmed in this paper. |
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