19 July 2010 MAIA: a rapid three-channel photometry CCD instrument for asteroseismology observations
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Abstract
The Mercator Advanced Imager for Asteroseismology (MAIA) is being designed particularly for asteroseismology of hot subdwarf stars. In order to achieve the required precision on the pulsation amplitude ratios, the photometric variations must be measured simultaneously in several bands with respect to constant reference stars in the field. MAIA is an optical imager to observe simultaneously in three color bands, corresponding approximately with an SDSS u, g, r+i+z photometric system. The fully dioptric design uses a common collimator, two dichroic beam splitters (cut-offs at 390nm and 550nm) and three cameras. MAIA covers a wide field of view (FoV) of 9.4' x 14.1' with a sampling of 0.27"/pix on the 1.2m Mercator Telescope. When replacing the collimator and with a modest reduction of the FoV, its host can also be used on larger telescopes. Each camera holds a fast-frame-transfer charge coupled device (CCD), cooled by three four-stage Peltier elements to -70 °C. The mechanical design minimizes structural flexure. Selected optical elements are mounted in quasi-isostatic lens mounts to minimize the effects of temperature variations.
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J. Vandersteen, J. Vandersteen, G. Raskin, G. Raskin, T. Agócs, T. Agócs, J. Morren, J. Morren, R. H. Østensen, R. H. Østensen, W. Pessemier, W. Pessemier, S. Prins, S. Prins, J. Swevers, J. Swevers, S. M. Tulloch, S. M. Tulloch, H. Van Winckel, H. Van Winckel, C. Aerts, C. Aerts, } "MAIA: a rapid three-channel photometry CCD instrument for asteroseismology observations", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77353B (19 July 2010); doi: 10.1117/12.856419; https://doi.org/10.1117/12.856419
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