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Using recent spectroscopic observations, we show that the triple system AOVel with an eclipsing BpSi primary is in fact a remarkable quadruple systemformed by two double-lined spectroscopic binaries with components close to theZAMS. All available data have been reanalyzed to derive proper orbitalparameters for both binary systems and to calculate absolute parameters of theeclipsing system. For the first time, direct determination of the radius andthe mass have been obtained for a BpSi star. The study of the physicalparameters of this unique system is especially important since it can be usedas a test of evolutionary models for very young stars of intermediate mass.Comment: 9 pages, 5 figures, accepted for publication in A&

AO Velorum: a young quadruple system with a ZAMS eclipsing BpSi primary