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We present a study of the X-ray sources present in the nearby L1551 starforming region, based on a deep XMM observation complemented with Chandra datafor the brightest sources. All the known pre-main sequence stars in the regionhave been detected, most of them with sufficient statistics to allow a detailedstudy of the temporal and spectral characteristics of their X-ray emission.Significant temporal (and spectral) variability on both short and long timescales is visible for most of the stars. In particular XZ Tau showslarge-amplitude variations on time scales of several hours with large changesin the intervening absorption, suggestive of the X-ray emission being eclipsedby the accretion stream (and thus of the X-ray emission being partly or totallyaccretion-induced). The coronal metal abundance of the WTTS sources isclustered around Z = 0.2, while the CTTS sources span almost two orders ofmagnitudes in coronal Z, even though the photospheric abundance of all stars inthe L1551 is likely to be very similar. Some individual elements (notably Ne)appear to be systematically enhanced with respect to Fe in the WTTS stars. Thesignificant differences between the spectral and temporal characteristics ofthe CTTS and WTTS populations suggest that a different emission mechanism is(at least partly) responsible for the X-ray emission of the two types of stars.Comment: 18 pages, Astronomy and Astrophysics in pres

An XMM-Newton-based X-ray survey of pre-main sequence stellar emission in the L1551 star-forming complex