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URL:https://murmitoyen.com/events/vanille/udem/detail/278036
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Harold A. McAlister\, Georgia State University
DESCRIPTION:Zooming in on the Stars with Astronomical InterferometryAstrono
 mical interferometry involves linking two or more telescopes separated by 
 tens or hundreds of meters to mimic a huge telescope capable of achieving 
 extraordinary angular resolution. Carried out at optical and near-infrared
  wavelengths\, interferometry is providing unprecedented views of stars\, 
 allowing us to zoom in and\, for the first time\, image their surfaces in 
 sufficient detail to detect features that have been inferred from techniqu
 es such as spectroscopy but never before seen directly. This talk will giv
 e an overview of the world's highest resolution interferometer - Georgia S
 tate University's six-telescope CHARA Array\, located on Mount Wilson\, Ca
 lifornia. The facility is making measurements such as the diameters of the
  smallest and coolest normal stars\, determining whether or not exoplanets
  are orbiting within the so-called habitable zones of their host stars\, i
 maging disks of gas and dusk surrounding the equatorial planes of certain 
 stars\, imaging the companions in binary star systems that are so close th
 at their mutual gravity distorts their shapes\, and measuringshape distort
 ions for very rapidly rotating single stars. In almost every case\, interf
 erometry is showing us some way in which our understanding of stars is inc
 orrect or too simple.Cette conférence s'adresse à tous\, y compris les p
 rofesseurs\, les chercheurs et les étudiants des trois cycles.Le café es
 t servi à partir de 11h20.
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