Physics – Plasma Physics
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..dppui2003t&link_type=abstract
American Physical Society, 52nd Annual Meeting of the APS Division of Plasma Physics, November 8-12, 2010, abstract #UI2.003
Physics
Plasma Physics
Scientific paper
Massive stars are not expected to harbor magnetic fields, owing to the absence of a sub-surface convection zone with which to drive a field-generating dynamo. Nevertheless, it is known that a small (˜5%) subset of these stars possess kilogauss-strength, ordered, stable fields. These fields greatly enhance the loss of angular momentum in the stars' radiation-driven winds, to such an extent that direct measurement of changes in the rotation periods of individual objects becomes a possibility. The past few years have witnessed the first realizations of this possibility, with the discovery of braking in at least two magnetic massive stars. In this presentation I will present these discoveries, and explain the underlying observational techniques that enable us to measure tiny changes in rotation periods. I will also review the complementary recent progress made in understanding the theoretical principles behind magnetic braking of massive stars.
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