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SUMMARY:Invited speaker: Spectropolarimetric constraints on the dynamos of
  low-mass stars - Victor See (European Space Agency)
DTSTART:20221130T094500Z
DTEND:20221130T103000Z
UID:TALK192116@talks.cam.ac.uk
DESCRIPTION:Decades of solar magnetic field observations have yielded a la
 rge amount of data with which to constrain dynamo models. However\, a comp
 rehensive theory of magnetic field generation in low-mass stars is current
 ly still out of reach. Although these observations offer a picture of the 
 Sun&rsquo\;s magnetic field with high spatial and temporal resolution\, th
 ey suffer from the fact that they probe only one object. As such\, they of
 fer no information on how factors such as stellar mass or rotation affect 
 dynamo processes.\nIn this talk\, I will cover how spectropolarimetry can 
 be used to reconstruct the large-scale photospheric magnetic field strengt
 hs and geometries of low-mass stars - a technique known as Zeeman-Doppler 
 Imaging. I will then review the main results obtained with Zeeman-Doppler 
 Imaging and the constraints that these results can offer to dynamo modelli
 ng. I will pay particular attention to how magnetic field properties vary 
 across the HR diagram as well as the temporal evolution of the magnetic fi
 elds of low-mass stars on both activity cycle time-scales and evolutionary
  time-scales.
LOCATION:Seminar Room 1\, Newton Institute
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