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Radii and masses for the young star AR Aurigae

Improved radii, masses and temperatures of the unevolved B-type binary AR Aurigae are determined by analyzing available light and radial velocity curves, in particular the previously neglected B, V light curves by O'Connell. New times of minimum are used to improve the light-time orbit of AR Aur AB around the centre of gravity of this triple system, and the period variations are taken into account in the photometric analysis. A new spectroscopic determination of the luminosity ratio is used to constrain the ratio of the radii, k=r B /r A , which is indeterminate from the photometric light curves; we find k=1.020±0.015