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Why do some water vapor emission lines in red supergiants have a complicated structure with lower peaks to the left and to the right of the peak at the central frequency? It has something to do with the stellar wind. Could it be due to the structure of the wind or the presence of dust? I don't see how dust could do this, but maybe if the water vapor isn't distributed in a spherically symmetric way around the star, you might get several slightly shifted peaks?

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