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Recently, strong, globally-ordered magnetic fields have been detected in someHerbig Ae and Be (HAeBe) stars, suggesting a possible evolutionary connectionto main sequence magnetic chemically peculiar Ap and Bp stars. We haveundertaken a detailed study of the binary system HD 72106, which contains a B9magnetic primary and a HAeBe secondary, using the ESPaDOnS spectropolarimetermounted on the CFHT. A careful analysis of the very young primary reveals thatit has an approximately dipolar magnetic field geometry, strong chemicalpeculiarities, and strong surface chemical abundance inhomogeneities. Thus theprimary is very similar to an Ap/Bp star despite having completed less then1.5% of its main sequence life, and possibly still being on the pre-mainsequence. In contrast, a similar analysis of the secondary reveals solarchemical abundances and no magnetic field.

Magnetic, Chemical and Rotational Properties of the Herbig Ae/Be Binary System HD 72106