24 December 2002 Detection and study of variable sources with wide field imagers
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In recent years massive CCD photometry has dramatically increased the number of known variable stars in the Milky Way and nearby galaxies of the Local Group. Some surveys are related to microlensing studies, distance determinations and the study of Cepheids and other pulsating stars, and are based on relatively small telescopes. The comparison of the performances of the various instruments shows the present limitations of the variable star research, and the requirements are to increase the sensitivity, spatial resolution and field of view. In order to get a better sensitivity, we adopted the Wh-photometry, or unfiltered observations. We discuss the merits and defects of this technique in the context of recent studies with the ESO 0.9m Dutch telescope and Wide Field Imager at the 2.2 m telescope. As regards the high precision photometry, we remark that a better control of the various error sources (including the stability of the instrumentation) is needed in order to detect very small amplitude variations with good confidence.
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Elio Antonello, Elio Antonello, Mauro Stefanon, Mauro Stefanon, Dino Fugazza, Dino Fugazza, Luciano Mantegazza, Luciano Mantegazza, Wolfgang Gieren, Wolfgang Gieren, } "Detection and study of variable sources with wide field imagers", Proc. SPIE 4836, Survey and Other Telescope Technologies and Discoveries, (24 December 2002); doi: 10.1117/12.456683; https://doi.org/10.1117/12.456683


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