New Calculations of Magnetic Braking for Sun-Like Stars

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Scientific paper

Our understanding of angular momentum loss in main sequence and pre-main-sequence stars is primarily based upon the extrapolation of solar wind observations to other stars, via analytic and semi-analytic models of stellar wind torques. I will present the results of new numerical solutions for stellar wind torques. This study is the first to include the fully self-consistent interaction of a dipolar magnetic field with the accelerating wind over a parameter space range that is sufficient to compare with the analytic modeling. The results suggest that the power law dependence of the stellar wind torque on observable quantities is significantly different than adopted in all previous work. This calls into question even our most basic understanding of the empirical Skumanich (1972) relationship (spin rate proportional to age to the power of -1/2) for the spin-down of main sequence stars like the sun. This research was supported by the University of Virginia through a Levinson/VITA Fellowship, partially funded by The Frank Levinson Family Foundation through the Peninsula Community Foundation

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