Buscar

Estamos realizando la búsqueda. Por favor, espere...

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.

 Fuente: Monthly Notices of the Royal Astronomical Society, 2016, 455(3), 2765-2771

 Editorial: Oxford University Press

 Fecha de publicación: 01/01/2016

 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

Autoría

COLODRO CONDE, CARLOS

ISIDRO VILLO PEREZ

PÉREZ GARRIDO, ANTONIO