The dramatic change of the fossil magnetic field of HD 190073 (Alecian et al.)

Vol. 549
In section 1. Letters

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

by E. Alecian, C. Neiner, S. Mathis, C. Catala, O. Kochukhov, J. Landstreet, and the MiMeS Collaboration, A&A 549, L8

The authors present spectropolarimatric observations of the Herbig Ae/Be star HD 190073. The star showed a stable dipole field for several years, but new observations indicate a sudden change of configuration - not seen before in intermediate or high-mass stars. The authors propose that this may be the result of the onset of a dynamo field in the convective core.