منابع مشابه
New model and application to stellar interferometry
Measurement of a star’s apparent diameter with an intensity interferometer yields its geometrical radius and its effective temperature when one knows or measures the specific centre to limb-darkening. This paper presents a formulation that (1) makes use of a single parameter and (2) is well suited for the interpretation and comparison of centre to limb darkening. Subsequently, this result is ap...
متن کاملDifferential path considerations in optical stellar interferometry.
A formulation of the differential-air-path problem for a large-baseline optical interferometer is presented. Because air is a dispersive medium, each wavelength has a different optical path length. This can be corrected to a large extent if an extra piece of glass is placed in each arm of the interferometer. The problem then becomes analogous to the doublet-achromat design, in which, in this ca...
متن کاملTowards the Intensity Interferometry Stellar Imaging System
The imminent availability of large arrays of large light collectors deployed to exploit atmospheric Cherenkov radiation for gamma-ray astronomy at more than 100 GeV, motivates the growing interest in application of intensity interferometry in astronomy. Indeed, planned arrays numbering up to one hundred telescopes will offer close to 5,000 baselines, ranging from less than 50 m to more than 100...
متن کاملStrehl ratio and visibility in long-baseline stellar interferometry.
The relationship between Strehl ratio (S), the parameter most often used by those in the adaptive optics field, and visibility (V), the parameter of most interest to those working in interferometry, is investigated. It is found that if the atmospheric turbulence is assumed to be Kolmogorov, V approximately S for high Strehl ratios. At low Strehl ratios, both simulations and an analytical formul...
متن کاملOptical Path Stability and Fringe Tracking in Optical Stellar Interferometry
In this paper we analyze the problems of fringe pattern estimation in optical stellar interferometry that are associated with optical path errors. Our rst nding is that an optimal fringe tracking system must track with path length errors of less than about one-eighth of the coherence length. The second is that if phase closure estimation is to be achieved at the lowest possible light levels, th...
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ژورنال
عنوان ژورنال: EAS Publications Series
سال: 2014
ISSN: 1633-4760,1638-1963
DOI: 10.1051/eas/1569008