  We have employed an extensive new timeseries of Stokes I and V spectra
obtained with the ESPaDOnS spectropolarimeter at the 3.6-m Canada-France-Hawaii
Telescope to investigate the physical parameters, chemical abundance
distributions and magnetic field topology of the slowly-rotating He-strong star
HD 184927. We infer a rotation period of 9.53071+-0.00120 from H-alpha, H-beta,
LSD magnetic measurements and EWs of helium lines. We used an extensive NLTE
TLUSTY grid along with the SYNSPEC code to model the observed spectra and find
a new value of luminosity. In this poster we present the derived physical
parameters of the star and the results of Magnetic Doppler Imaging analysis of
the Stokes I and V profiles. Wide wings of helium lines can be described only
under the assumption of the presence of a large, very helium-rich spot.
