New data on the cpmplex field structure of chemically peculiar stars
As a result of BTA observations of 23 chemically peculiar stars with
strong magnetic fields, it was found that in 22 of them the longitudinal
magnetic field, measured from the hydrogen line cores are considerably
lower (by about 1/3) than the value measured from metal lines in the
same spectra. (See Figures 1 and 2 - a star with a strong field 53 Cam
is taken as an example).
Fig.1. The figure shows the curves of the variability of the longitudinal field component Be with the rotational period phase for the star 53 Cam. It is evident that the field strength, measured from hydrogen lines core (red dots) and the amplitude of its variability is much lower than that measured from metal lines (blue dots).
Fig.2. The Zeeman spectrum of a star with a strong magnetic field, 53 Cam. Red shows the right circularly polarized spectrum, blue - the left circularly polarized one. At the top of the figure the behavior of the V-Stokes parameter with wavelength is demonstrated. It is clearly seen that the polarization signal in the hydrogen line core is much smaller than that obtained from the metal lines, the longitudinal magnetic field Be, measured along the metal lines is +3620±110 gauss, from the hydrogen line it amounts to +1570±550 gauss.