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We compare surface maps of the chemically peculiar star HD 50773 producedwith a Bayesian technique and based on high quality CoRoT photometry with thosederived from rotation phase resolved spectropolarimetry. The goal is toinvestigate the correlation of surface brightness with surface chemicalabundance distribution and the stellar magnetic field.  The rotational period of the star was determined from a nearly 60 day longcontinuous light curve obtained during the initial run of CoRoT. Using aBayesian approach to star-spot modelling, which in this work is applied for thefirst time for the photometric mapping of a CP star, we derived longitudes,latitudes and radii of four different spot areas. Additional parameters likestellar inclination and the spot's intensities were also determined. The CoRoTobservations triggered an extensive ground-based spectroscopic andspectropolarimetric observing campaign and enabled us to obtain 19 differenthigh resolution spectra in Stokes parameters I and V with NARVAL, ESPaDOnS, andSemelPol spectropolarimeters.  Doppler and Magnetic Doppler imaging techniques allowed us to derive themagnetic field geometry of the star and the surface abundance distributions ofMg, Si, Ca, Ti, Cr, Fe, Ni, Y, and Cu. We find a dominant dipolar structure ofthe surface magnetic field. The CoRoT light curve variations and abundances ofmost elements mapped are correlated with the aforementioned geometry: Cr, Fe,and Si are enhanced around the magnetic poles and coincide with the brightregions on the surface of HD 50773 as predicted by our light curve synthesisand confirmed by photometric imaging.

Surface structure of the CoRoT CP2 target star HD 50773