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Chromaticity in all-reflective telescopes for astrometry

Chromaticity in all-reflective telescopes for astrometry

Authors :
Mario G. Lattanzi
D. Busonero
Davide Loreggia
D. Gardiol
Mario Gai
Source :
Astronomy & Astrophysics. 449:827-836
Publication Year :
2006
Publisher :
EDP Sciences, 2006.

Abstract

Chromatic effects are usually associated with refractive optics, so reflective telescopes are assumed to be free from them. We show that all-reflective optics still bears significant levels of such perturbations, which is especially critical to modern micro-arcsecond astrometric experiments. We analyze the image formation and measurement process to derive a precise definition of the chromatic variation of the image position, and we evaluate the key aspects of optical design with respect to chromaticity. The fundamental requirement related to chromaticity is the symmetry of the optical design and of the wavefront errors. Finally, we address some optical engineering issues, such as manufacturing and alignment, providing recommendations to minimize the degradation that chromaticity introduces into astrometry.<br />10 pages, 8 figures

Details

ISSN :
14320746 and 00046361
Volume :
449
Database :
OpenAIRE
Journal :
Astronomy & Astrophysics
Accession number :
edsair.doi.dedup.....7ba614c92396a9fd545f0dad7d825327
Full Text :
https://doi.org/10.1051/0004-6361:20054180