...Aerts
Senior Research Assistant, Belgian National Fund for Scientific Research.
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...correspondence
For a non-pulsating uniformly rotating spherical star there is a one-to-one relation between a straight line on the stellar disk, parallel to the stellar rotation axis, and a position in the line profile: the integrated stellar light emitted by the surface elements on this line is Doppler-mapped to a single position in the line profile by the rotation of the star.
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