Near-infrared (2.2 mum) long baseline interferometric observations of Vega
are presented. The stellar disk of the star has been resolved, and the data
have been fitted with a limb-darkened stellar disk of diameter Theta (LD)
= 3.28 +/-0.01 mas. The derived effective temperature is T-eff = 9553 +/- 1
11 K. However, the residuals resulting from the stellar disk model appear t
o be significant and display organized structure. Instrumental artifacts, s
tellar surface structure, stellar atmosphere structure, and extended emissi
on/scattering from the debris disk are discussed as possible sources of the
residuals. While the current data set cannot uniquely determine the origin
of the residuals, the debris disk is found to be the most likely source. A
simple debris disk model, with 3%-6% of Vega's flux emanating from the dis
k at r less than or similar to4 AU, can explain the residuals.