July 11-15, 2011
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Why do massive stars contain such weak magnetic fields?

Jonathan Braithwaite (University of Bonn)

In the ISM from which stars form, magnetic energy is comparable to thermal and kinetic. Once a star has formed, however, the magnetic energy is many orders of magnitude below equipartition with the gravitational, thermal and usually also the rotational energies. I present a natural explanation for this in terms of magnetic helicity conservation during core collapse, while magnetic energy and flux can be destroyed. In addition, I touch on processes such as meridional circulation and their likely influence on what magnetic field is left over from formation.
(to be confirmed by the SOC)