An apparent universal magnetic constant for cool stars

Abstract

Zeeman broadening measurements are examined for G and K dwarfs, revealing a remarkable relation between B, the magnetic field strength, and A-sub-zero, the areal coverage factor. The product BA-sub-zero is a constant independent of physical parameters such as spectral type and rotational velocity. If this is not an artifact of the measuring or reduction techniques, the number of magnetic field lines, when averaged over the star, is a universal magnetic constant for cool stars.