How Do Stellar Spots Affect Stellar Winds and Angular Momentum Loss?

Details How Do Stellar Spots Affect Stellar Winds and Angular Momentum Loss? How Do Stellar Spots Affect Stellar Winds and Angular Momentum Loss?

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431401c&link_type=abstract

American Astronomical Society, AAS Meeting #214, #314.01; Bulletin of the American Astronomical Society, Vol. 41, p.758

Astronomy and Astrophysics

Astronomy

Scientific paper

We simulate the effect of star spots latitudinal variations, as well as their magnitude on stellar angular momentum loss to the stellar wind. We use the Michigan solar corona global MagnetoHydroDynamic (MHD) model, in which the wind distribution is dictated by the magnetic field structure. We find that the spots location significantly changes the stellar wind structure, and as a result, the total mass loss rate and angular momentum loss rate are modified. In particular, we find that the angular momentum loss rate is controlled by the mass flux when spots are located at low latitudes. When spots are located at high latitudes however, the angular momentum loss rate is controlled by the high increase in density between the stellar surface and the Alfvén surface.

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