How does the rotation of a star affect the spectral line profile? In this case, what spectral parameter remains the same

How does the rotation of a star affect the spectral line profile? In this case, what spectral parameter remains the same as for a non-rotating star?

The rotation of the star leads to a broadening of the spectral line due to the Doppler effect. In this case, the equivalent line width will be the same as that of a non-rotating star.

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