SIMBAD references

We searched again for a radial (vertical) gradient of the longitudinal magnetic field of the chemically peculiar star alpha^2 CVn. We considered the history of magnetic studies of this object demonstrating large differences in the data obtained with different methods. Such differences can be explained by the fact that the magnetic field sharply drops (by 2 orders stronger than in the case of a dipole structure) with height in the atmosphere. The spectroscopic, spectropolarimetric, and photometric data indicate that the large- and small-scale structure of the atmosphere of alpha^2 CVn has not changed over more than 90 years of observations.