Tuesday 07 Jul 2020: [Journal Club] Title: How underestimated are Zeeman-doppler imaging based torque estimates?
Victor See - University of Exeter
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.