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Abstract: Images of stars adopt shapes far from the ideal Airy pattern due to atmospheric density fluctuations. Hence, diffraction-limited images can only be achieved by telescopes without atmospheric influence, e.g. spatial telescopes, or by using techniques like adaptive optics or lucky imaging. In this paper, we propose a new computational technique based on the evaluation of the COvariancE of Lucky Images (COELI). This technique allows us to discover companions to main stars by taking advantage of the atmospheric fluctuations. We describe the algorithm and we carry out a theoretical analysis of the improvement in contrast. We have used images taken with 2.2-m Calar Alto telescope as a test bed for the technique resulting that, under certain conditions, telescope diffraction limit is clearly reached. © 2015 The Authors.
Fuente: MNRAS 455, 2765?2771 (2016)
Publisher: Oxford University Press
Year of publication: 2016
No. of pages: 7
Publication type: Article
DOI: 10.1093/mnras/stv2496
ISSN: 0035-8711,1365-2966
Publication Url: https://doi.org/10.1093/mnras/stv2496
Consult in UCrea Read publication
MANUEL PEREZ CAGIGAL
PEDRO JOSE VALLE HERRERO
COLODRO CONDE, CARLOS
ISIDRO VILLO PEREZ
PÉREZ GARRIDO, ANTONIO
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