Mixed poloidal (black lines) and toroidal (colour scale) magnetic field modelled using the formalism of Duez & Mathis (2010); see Eq. (2). Values are normalised by the maximum radial field amplitude. The field is confined inside the radiative region of the star, the extent of which is given by the corresponding evolution model MESA and indicated by the black circle. Left to right: cases of a 1.5 M⊙, Z = 0.02 star from the SG phase to RGB, with ages of 2.65, 2.75, and 2.80 Gyr, and effective temperatures of 5967, 5075, 4900 K, respectively.
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