Fig. 1.

Coefficient β of the Legendre function P2(cos θ) as a function of the fractional radius for a 10 M⊙ star rotating at various rates. Solid lines represent the deformation from the Chandrasekhar-Milne’s expansion and dotted lines the deformation from 2D structure models. is the rotation frequency normalised by
where R is the mean radius.
increases from top to bottom in the figure.
corresponds to
at the equator as observed for HD 49330.
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