Magnetostatic Models of Sunspots

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stellar Magnetic Fields, Star Spots, Equipartition Field, Sunspots, Filling Factor

Scientific paper

Magnetostatic models of starspots of late type main sequence stars(G5V - K5V) have been constructed to investigate their physical characteristics by using the similarity law suggested by Schlueter and Temesvary(1958) and later employed by Deinzer(1965) and Yun(1968). The starspots are assumed to be single, circular and in horizontal magnetostatic equilibrium. In the present study we considered only those model spots whose area covers less than 12% of the entire stellar surface as suggested by observations. The computed surface field strength of our model spots ranges from 10E3 to several 10E3 gauss and their magnetic flux is found to be 10 - 100 times that of sunspots. The field strength is sensitive to spectral type, which increases with later spectral type. In contrast to the field strength, the area of starspots depends strongly on the total magnetic flux. Finally, it is noted that the computed field strength of model spots belonging to G0V - G5V falls below the equipartition field strength at their parent stellar surface unless the coverage is less than 2%. This suggests that the observed spot on G0V - G5V stars is likely to be a group of small starspots.

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