The Visible spEctroGraph and polArimeter (VEGA) was installed in September 2007 at the CHARA array. VEGA measures spectrally dispersed interference fringes, providing a spatial resolution of 0.3 mas and spectral resolutions from R = 6,000 to 30,000 over a wavelength of 480-850nm. VEGA was decommissioned in December 2020 to make way for the next generation optical, 6-telescope combiner SPICA.
VEGA can be used to measure the fundamental properties of stars, study their stellar activity, and analyze the spatial and kinematic properties of their circumstellar environments.
VEGA: Visible spEctroGraph and polArimeter for the CHARA array: principle and performance - Mourard et al. 2009, A&A, 508, 1073 (pdf)
Spatio-spectral encoding of fringes in optical long-baseline interferometry: Example of the 3T and 4T recombining mode of VEGA/CHARA - Mourard et al. 2011, A&A, 531, A110 (pdf)
The Operation of VEGA/CHARA: From the Scientific Idea to the Final Products - Ligi et al. 2013, JAI, 2,1340003 (pdf)
VEGA: a visible spectrograph and polarimeter for CHARA - Mourard et al. 2006, SPIE, 6268, 3Q (pdf)
VEGA: a new Visible spEctroGraph and polArimeter on the CHARA Array - Mourard et al. 2008, SPIE, 7013, 23 (pdf)
Performances and first science results with the VEGA/CHARA visible instrument - Mourard et al. 2010, SPIE, 7734, 0D (pdf)
Performances and first science results with the VEGA/CHARA visible instrument - Mourard et al. 2012, SPIE, 8445, 0K (pdf)
Modeling chromatic instrumental effects for a better model fitting of optical interferometric data - Tallon et al. 2014, SPIE, 9146, 0N (pdf)