Abundance and magnetic field geometries of the helium-strong stars

High signal-to-noise coude reticon spectra of five helium-strong stars have been obtained in two spectral regions (;Helium line profile variations of HD 64740 may be modelled with two spots with anomalously high helium abundances near the magnetic poles of the star. Silicon, appears to have a large abundance in a high latitude band around the star. The surface magnetic field of HD 64740 is not strong enough to cause magnetic intensification effects in the Si III multiplet 2 line profiles.;The peculiar, broad helium line profiles of ;The helium line profiles of ;A theoretical model for the peculiar longitudinal magnetic field variations of HD 37776 is proposed. The model consists of colinear dipole, quadrupole, and octupole field components that result in a magnetic field that varies between 20 and 60 kG over the surface of the star. Helium and silicon abundance geometries consistent with equatorial and polar distributions of the respective elements support the field model, as do the pronounced differential magnetic intensification effects seen in the silicon lines.;Several suggestions for interesting future observational and theoretical work are discussed.