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Proceedings Paper

Detection and study of variable sources with wide-field imagers
Author(s): Elio Antonello; Mauro Stefanon; Dino Fugazza; Luciano Mantegazza; Wolfgang Gieren
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Paper Abstract

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.

Paper Details

Date Published: 24 December 2002
PDF: 8 pages
Proc. SPIE 4836, Survey and Other Telescope Technologies and Discoveries, (24 December 2002); doi: 10.1117/12.456683
Show Author Affiliations
Elio Antonello, Osservatorio Astronomico di Brera (Italy)
Mauro Stefanon, Osservatorio Astronomico di Brera (Italy)
Dino Fugazza, Osservatorio Astronomico di Brera (Italy)
Ctr. Galileo Galilei (Spain)
Luciano Mantegazza, Osservatorio Astronomico di Brera (Italy)
Wolfgang Gieren, Univ. de Concepcion (Chile)

Published in SPIE Proceedings Vol. 4836:
Survey and Other Telescope Technologies and Discoveries
J. Anthony Tyson; Sidney Wolff, Editor(s)

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