SICIAK , Antonin

This work is linked to the development of a stellar correlometer operating in the visible spectrum, on the plateau de Calern, a site of the Observatoire de la Côte d'Azur for observations in astronomy/astrophysics. The dissertation has three parts: "Fundamentals", "Realizations", and "Explorations". There are six main original results. The...

We compare the field-field g(1)(τ), intensity-field g(3/2)(τ), and intensity-intensity g(2)(τ) correlation functions for models that are of relevance in astrophysics. We obtain expressions for the general case of a chaotic radiation, where the amplitude is Rician based on a model with an ensemble of harmonic oscillators in Brownian motion. We...

In this paper we report on spatial intensity interferometry measurements within the H$\alpha$ line on two stars: the Luminous Blue Variable supergiant P Cygni, and the late-type B supergiant Rigel. The experimental setup was upgraded to allow simultaneous measurement of two polarization channels, instead of one in our previous setup, and the...