High-spatial and high-spectral 1-D imaging of the red supergiant Betelgeuse in the 2.3 µm CO lines with the Very Large Telescope Interferometer

Ohnaka et al. 2011, A&A, 529, A163

Spatial resolution = 9.8 mas, Spectral resolution = 6000

Lower panel shows the observed 2.3 µm CO line spectrum of Betelgeuse. As the red dot moves across the spectrum, the reconstructed 1-D image is shown in the upper panel. The 1-D image is convolved with the beam whose width is shown by the thick bar.