Making sense of the spectral line profiles of Betelgeuse and other red supergiants

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Fig. 6

Left: same as Fig. 5, but for β = 0.4. The maximum velocity is kept at 40 km s⁻¹, as for Betelgeuse. Right: Observed intensity profiles of RW Cep, as in Fig. 3. The key points of comparison are the broadening of the profiles and their triangular shape, illustrated by the step-rising blue wing.

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