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Séminaire du Jeudi 10 Mai 2012

Imaging the Surfaces of Stars

John Monnier (U. of Michigan)
Jeudi 10 Mai - 11 h 00
Salle Manuel Forestini - IPAG

Under even the best atmospheric conditions, telescope diffraction fundamentally limits the angular resolution for astronomical imaging. Using interferometry, we can coherently combine light from widely-separated telescopes to overcome the single-telescope diffraction limit to boost our imaging resolution by orders of magnitude. I will review recent technical and scientific breakthroughs made possible by the Michigan Infrared Combiner of the CHARA Array on Mt. Wilson, CA, with baselines of 330 meters allowing near-infrared imaging with sub-milli-arcsecond resolution. I will present the first resolved images of main sequence stars besides the Sun, focusing on the oblate and gravity-darkened photospheres of rapidly rotating stars. We can now also resolve the interacting components of close binary stars for the first time and I will highlight the recent remarkable eclipse of epsilon Aurigae as viewed by CHARA.

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Sous la tutelle de:


Sous la tutelle de:

CNRS Université Grenoble Alpes