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HD 149277 is a rare SB2 system with a slowly rotating magnetic He-richprimary with $P_{\rm rot}=25.4$ d. The CFHT/ESPaDOnS archive spectra revealed$P_{\rm orb}=11.5192 \pm 0.0005$ d indicating strong subsynchronous rotation ofthe primary component. Such a strong subsynchronous rotation was not detectedin any other SB2 system with a magnetic chemically peculiar component. Ourinspection of the spectra revealed the presence of resolved Zeeman splitspectral lines allowing us to determine the variability of the mean magneticfield modulus over the rotation period. The maximum of the magnetic fieldmodulus concides roughly with the positive extremum of the longitudinal field,whereas the minimum of the modulus with the negative extremum of thelongitudinal field. No evidence for a longitudinal magnetic field was seen inthe circularly polarized spectra of the secondary component. Using archivaldata from the ASAS3 survey, we find in the frequency spectrum only onesignificant peak, corresponding to the period $P_{\rm phot}=25.390 \pm 0.014$d. This value is in good agreements with the previous determination of therotation period, $P_{\rm rot}=25.380\pm0.007$ d, which was based onlongitudinal magnetic field measurements.

HD 149277: a rare short-period SB2 system with a subsynchronously rotating magnetic He-rich primary