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Magnetism can greatly impact the evolution of stars. In some stars with OBAspectral types there is direct evidence via the Zeeman effect for stable,large-scale magnetospheres, which lead to the spin-down of the stellar surfaceand reduced mass loss. So far, a comprehensive grid of stellar structure andevolution models accounting for these effects was lacking. For this reason, wecomputed and studied models with two magnetic braking and two chemical mixingschemes in three metallicity environments with the MESA software instrument. Wefind notable differences between the subgrids, which affects the modelpredictions and thus the detailed characterisation of stars. We are able toquantify the impact of magnetic fields in terms of preventing quasi-chemicallyhomogeneous evolution and producing slowly-rotating, nitrogen-enriched ("Group2") stars. Our model grid is fully open access and open source.

Spin-down and reduced mass loss in early-type stars with large-scale magnetic fields