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Tuesday 07 Jul 2020[Journal Club] Title: How underestimated are Zeeman-doppler imaging based torque estimates?

Victor See - University of Exeter

Zoom 11:15-11:45

Low-mass stars are known to spin-down over their main sequence life-times due to braking from magnetised winds. A key ingredient to estimating angular momentum-loss rates is the stellar magnetic field strength and geometry. These are parameters that Zeeman-Doppler imaging (ZDI) can provide. Although ZDI cannot recover the magnetic field associated with small-scale fields, this has not been thought to be a problem since the spin-down torque is dominated by large-scale magnetic fields. However, recent work indicates that ZDI also underestimates the magnetic flux in the large-scale fields. In this talk, I will discuss the amount by which torque estimates based on ZDI maps may be underestimated by.

The meeting will be conducted Via Zoom, contact Tom Wilson for more information.

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