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In the context of the ESPaDOnS and Narval spectropolarimetric surveys ofHerbig Ae/Be stars, we discovered and then monitored the magnetic field of HD190073 over more than four years, from 2004 to 2009. Our observations alldisplayed similar Zeeman signatures in the Stokes V spectra, indicating that HD190073 hosted an aligned dipole, stable over many years, consistent with afossil origin. We obtained new observations of the star in 2011 and 2012 anddetected clear variations of the Zeeman signature on timescales of days toweeks, indicating that the configuration of its field has changed between 2009and 2011. Such a sudden change of external structure of a fossil field hasnever previously been observed in any intermediate or high-mass star. HD 190073is an almost entirely radiative pre-main sequence star, probably hosting agrowing convective core. We propose that this dramatic change is the result ofthe interaction between the fossil field and the ignition of a dynamo fieldgenerated in the newly-born convective core.

The dramatic change of the fossil magnetic field of HD 190073: evidence of the birth of the convective core in a Herbig star ?