Rotationally broadened SiII 6347 model line profile in a main sequence B2-type star (rest Teff = 19 000 K, log g = 4.0) seen at the inclination angle i = 45°. a) Line profiles affected by gravitational darkening in stars rotating at different surface Ω/Ωc rates and differential rotation parameter α = 0.0; b) Line profiles with gravitational darkening effect in stars rotating at Ωo/Ωc = 0.9 and for several values of the differential rotation parameter α. To calculate the line profiles, we used fiGD = 0.25.
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