The P(23) rotational component of the B–X (0, 0) band of AlO in the simulation (red line) and in the observed spectrum of VY CMa (blue histogram). The velocity is given with respect to the average wavelength of the doublet, whose splitting is 4.2 km s-1. The positions of the doublet components are shown by the two dashed lines in the upper part of the figure. Lines in the lower part show the hyperfine splitting in both components (from Launila & Berg 2011).
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