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Fig. 15

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Sketch of a stellar disc decomposed into areas of nearly-constant velocity (“υ-stripes”) and surface normal direction (“μ-rings”) for a star with differential rotation in latitude. Red circles indicate the limits between the μ-rings, blue curves indicate the limits between υ-stripes, the dotted green curves show constant latitude circles on the stellar sphere (in steps of 10°). Two bins (w1,3 and w2,7) are filled in different shades of grey for illustration. The shown star has an inclination of 45° and rotates differentially with twice the solar equator-to-pole shear (α = 0.4). In this sketch we used Nμ = 5 and Nυ = 11. For the numerical stellar-disc integrations considered in Sect. 5.4 and 5.5 we used Nμ = 10 and Nυ = 51.

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