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Garraffo, C.; Drake, J. J.; Dotter, A.; Choi, J.; Burke, D. J.; Moschou, S. P.; Alvarado-Gómez, J. D.; Kashyap, V. L.; Cohen, O.
The Astrophysical journal, 07/2018, Letnik: 862, Številka: 1Journal Article
Abstract Observations of young open clusters (OCs) show a bimodal distribution of rotation periods that has been difficult to explain with existing stellar spin-down models. Detailed magnetohydrodynamic (MHD) stellar wind simulations have demonstrated that surface magnetic field morphology has a strong influence on wind-driven angular momentum loss. Observations suggest that faster rotating stars store a larger fraction of their magnetic flux in higher-order multipolar components of the magnetic field. In this work, we present an entirely predictive new model for stellar spin-down that accounts for the stellar surface magnetic field configuration. We show how a magnetic complexity that evolves from complex toward simple configurations as a star spins down can explain the salient features of stellar rotation evolution, including the bimodal distribution of both slow and fast rotators seen in young OCs.
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