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SUMMARY:Angular momentum evolution in low-mass stars: a fresh look - Subu 
 Mohanty (Imperial)
DTSTART:20130306T131500Z
DTEND:20130306T134500Z
UID:TALK43118@talks.cam.ac.uk
CONTACT:29451
DESCRIPTION:The physics of angular momentum evolution in low-mass stars is
  one of the oldest and most fundamental issues in stellar evolution\, dete
 rmined by initial conditions during star formation\, stellar structure evo
 lution\, and the behavior of stellar magnetic fields. Previous theoretical
  work attained reasonable agreement with rotation data for solar-type star
 s\, but failed drastically when applied to very low-mass fully convective 
 stars. Here we show that the empirical picture of angular momentum evoluti
 on arises naturally if rotation is related to magnetic field strength inst
 ead of to magnetic flux.  Wr formulate a corrected braking law based on th
 is\, for the *full* range of low-mass stars (solar-tpe to fully convective
 ). Angular momentum evolution then becomes a strong function of stellar ra
 dius\, explaining the main trends observed in open clusters and field star
 s at a few Gyr across this range in stellar masses\, without requiring bar
 oque changes in stellar dynamos or field topologies.  Further improvements
  and generalisations to the field geometry and wind velocity are also disc
 ussed.
LOCATION:Sackler Lecture Theatre\, IoA
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