Imaging Stellar Surfaces at the CHARA Array - Theo ten Brummelaar - 10/13/21

Описание: This is a high-level research talk designed for professional astronomers. It is part of the Caltech Astronomy Colloquium Series, hour-long presentations given weekly by top scientists from around the world to the members of our department. All are welcome to watch these colloquium presentations; however, for talks specifically designed for the general public, please see our Caltech Astro Outreach channel:    / caltechastro  . Timestamps and abstract are included below.

Date: 10/13/21
Speaker: Theo ten Brummelaar (Director, CHARA Array),
Gail Schaefer (Associate Director, CHARA Array)
Title: Imaging Stellar Surfaces at the CHARA Array
Abstract :
The CHARA Array is a six 1-m telescope optical/infrared interferometer constructed and operated by Georgia State University and located just to our north at Mount Wilson Observatory. With the largest baselines in the world and milli-arcsecond resolution, the CHARA Array has addressed many aspects of stellar astrophysics including measuring stellar diameters, imaging the surfaces of stars, studying the morphology of AGN cores, resolving the structure of circumstellar disks, imaging targets of opportunity like Novae, and mapping the orbits of close binary companions. We will provide an overview of the Array itself, focusing on the adaptive optics systems, the addition of a seventh movable telescope, experiments with fiber-based beam transport, and the development of the next generation of beam combiners. The new instrumentation will improve sensitivity and provide six-way beam combination at a variety of wavelength regions including R, I, J, H and K bands. We will then highlight recent science results and discuss the open access time that is available to the community through the NOIRLab time allocation process.