2017AstBu..72..165R

We present the results of magnetic field measurements of four chemically peculiar (CP) stars with helium abundance anomalies which are the members of the Orion stellar association OB1. The stars under study were classified as magnetic by other authors earlier. The present paper contains the results of the extensive study of the stars. Magnetic field measurements allowed us to conclude that HD 36540 has a weak field and the longitudinal component Be does not exceed 500 G. The longitudinal field of HD 36668 varies with the period P=2.11884 and the amplitude from -2 to +2 kG. The magnetic field of HD 36916 has mainly negative polarity and varies within the range from 0 to -1 kG with the period 1.565238d. HD 37058 is a magnetic star, the longitudinal field of which varies from -1.2 to +0.8 kG with the period P = 14.659d The Be field field variability pattern for the stars HD 36916 and HD 37058 is of a simple harmonic type. The longitudinal field of HD 36668 is best described with two combined harmonic functions ("a double wave"). The variability period of HD 36540 is still undetermined. For all the stars from this paper, we measured radial velocities Vr, axial rotation rates vsini, and determined basic parameters of atmospheres (effective temperatures Teff and gravity acceleration log g. We also estimated masses M, luminosities L, and radii R of the stars.