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Fig. 2

image

Stretched period échelle diagrams for red giant branch stars with different inclinations. The rotational components are identified in an automatic way through a correlation of the observed spectrum with a synthetic one constructed using Eq. (9). The colours indicate the azimuthal order: the m = {−1, 0, +1} rotationalcomponents are represented in green, light blue, and red, respectively. The symbol size varies as the power spectral density. Left panel: star seen pole-on where only the m = 0 rotational component is visible. Middle panel: star seen equator-on where the m = {−1, +1} componentsare visible. Right panel: star with an intermediate inclination angle where all the three components are visible.

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