The science potential of Cherenkov arrays used as intensity interferometers
Michael Daniel (Durham University) & Willem-Jan de Wit (University of Leeds)

The future IACT observatories CTA, AGIS (completion 2015) with 30-90 
telescopes will provide 400-4000 different baselines that range in length
between 50m and a kilometre. Intensity interferometry with such arrays of
telescopes attains 50 micro-arcsecond resolution for a limiting m~8.5. Phase
information can be extracted from the interferometric measurement with phase
closure, allowing image reconstruction. This technique opens the possibility
of a wide range of studies amongst others, probing the stellar surface
activity and the dynamic AU scale circumstellar environment of stars in
various crucial evolutionary stages. Here we focus on the astrophysical
potential of an intensity interferometer utilising planned new gamma-ray
instrumentation.