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We present longitudinal magnetic field measurements $\langle B_z \rangle$ forthe Herbig Ae primary and the T Tauri secondary in the SB2 system HD 104237.These measurements were carried out using high spectral resolution observationsobtained with the High Accuracy Radial velocity Planet Searcher in polarimetricmode, installed at the ESO La Silla 3.6 m telescope. In agreement with previousstudies of Herbig Ae stars, the longitudinal magnetic field in the primary israther weak, ranging from 47 G to 72 G. The secondary component possesses avariable, much stronger magnetic field, up to 600 G, as expected for amagnetically active T Tauri star. We estimated the rotation period of theprimary, $P_{\mathrm{rot}}=4.33717\pm0.00316$ d ($=104\pm0.08$ h), from metalline equivalent width variations.

The two magnetic components in the Herbig Ae SB2 system HD 104237