CHARA has formal agreements with several institutions that are expanding the capabilities of the Array through additional beam combiners and complementary scientific expertise.

Georgia State University

GSU is the owner and operator of the CHARA array. In addition to the interferometric facility, this group has built two beam combiners: the two-telescope CLASSIC and three-telescope CLIMB beam combiners.

The FLUOR group

The FLUOR Group is headed by Vincent du Foresto of the Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA) of l'Observatoire de Paris, Meudon, France. FLUOR is a two-element beam combiner that provides high precision interferometric data used to measure stellar pulsations and probe the inner environments surrounding stars.The instrument is currently being upgraded to provided higher performance.

The MIRC/CHAMP group

The Michigan Infrared Beam Combiner (MIRC) has provided the first images ever obtained for a main sequence star other than the sun. This instrument, which combines light from four CHARA telescopes simultaneously, was developed by John Monnier and his optical interferometry group in the Astronomy Department of the University of Michigan. Dr. Monnier's team is also developing a fringe tracker for the Array.

The SUSI group

The SUSI Group, under the leadership of Peter Tuthill of the Institute of Astronomy, University of Sydney, Australia, operates the Sydney University Stellar Interferometer located at Narrabri in New South Wales where SUSI observations in the southern hemisphere can complement CHARA work in the north. A pair of Precision Astronomical Visible Observations (PAVO) instruments have been installed at SUSI and at the CHARA Array in a collaboration involving Michael Ireland (Macquarie University), Peter Tuthill (Sydney University) and Theo ten Brummelaar (CHARA).

The VEGA group

The VEGA Group, with Denis Mourard as principal investigator, is located at the Laboratoire Gemini of l'Observatoire de la Cote d'Azur, Nice, France. The VEGA instrument has been installed at the CHARA Array and is providing interferometric capabilites at visible wavelengths including spectroscopic and polarimetric measurements at very high angular resolution.