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Covariance of lucky images for increasing objects contrast : Diffraction-limited images in ground-based telescopes

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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: MNRAS 455, 2765?2771 (2016)

Editorial: Oxford University Press

 Año de publicación: 2016

Nº de páginas: 7

Tipo de publicación: Artículo de Revista

DOI: 10.1093/mnras/stv2496

ISSN: 0035-8711,1365-2966

Url de la publicación: https://doi.org/10.1093/mnras/stv2496

Autores/as

COLODRO CONDE, CARLOS

ISIDRO VILLO PEREZ

PÉREZ GARRIDO, ANTONIO