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We focus on early-B type stars with helium overabundance, for which thepresence of a magnetic field has not previously been reported. The measurementswere carried out using high-spectral-resolution spectropolarimetricobservations obtained with the High Accuracy Radial velocity Planet Searcher(HARPS) in polarimetric mode, installed at the ESO La Silla 3.6m telescope. Forfive He-rich stars, the longitudinal magnetic field was detected for the firsttime. For one target, HD58260, the presence of a longitudinal magnetic field ofthe order of 1.8 kG has already been reported in the literature, but themagnetic field has remained constant over tens of years. Our measurementcarried out using the polarimetric spectra obtained in 2015 March indicates aslight decrease of the longitudinal magnetic field strength compared tomeasurements reported in previous works. A search for periodic modulation inavailable photometric data allowed us to confidently establish a period of2.64119$\pm$0.00420 d in archival ASAS3 data for CPD -27$^{\circ}$ 1791. Noperiod could be determined for the other five stars. The obtained resultssupport the scenario that all He-rich stars are detectably magnetic and form anextension of the Ap star phenomenon to higher temperatures.

Detection of magnetic fields in He-rich early B-type stars using HARPSpol