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HD 164492C is a spectroscopic triple stellar system that has been recentlydetected to possess a strong magnetic field. We have obtained high-resolutionspectroscopic and spectropolarimetric observations over a timespan of two yearsand derived physical, chemical, and magnetic properties for this object. Thesystem is formed by an eccentric close spectroscopic binary (Ca1-Ca2) with aperiod of 12.5 days, and a massive tertiary Cb. We calculated the orbitalparameters of the close pair, reconstructed the spectra of the threecomponents, and determined atmospheric parameters and chemical abundances byspectral synthesis. From spectropolarimetric observations, multi-epochmeasurements of the longitudinal magnetic fields were obtained. The magneticfield is strongly variable on timescales of a few days, with a most probableperiod in the range of 1.4-1.6 days. Star Cb with Teff~25000 K is theapparently fastest rotator and the most massive star of this triple system andhas anomalous chemical abundances with a marked overabundance of helium,0.35+/-0.04 by number. We identified this star as being responsible for theobserved magnetic field, although the presence of magnetic fields in thecomponents of the Ca pair cannot be excluded. Star Ca1 with a temperature ofabout 24000 K presents a normal chemical pattern, while the least massive starCa2 is a mid-B type star (Teff~15000 K) with an overabundance of silicon. Theobtained stellar parameters of the system components suggest a distance of 1.5kpc and an age of 10-15 Myr.

B fields in OB stars (BOB): The magnetic triple stellar system HD 164492C in the Trifid nebula