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Analysis of high-resolution spectropolarimetric observations of early-typemagnetic stars is currently the most advanced method of obtaining detailedinformation on their surface magnetic field topologies and horizontal spotdistributions. In this study we analyse a new set of high-quality four Stokesparameter observations of the magnetic Ap star HD119419 - a member of the 14Myr old Lower Cen-Cru association - for the purpose of studying the surfacefield topology and mapping the chemical abundance spots. We made use of thecircular and linear polarisation data collected for HD119419 with the HARPSpolinstrument at the ESO 3.6-m telescope. These observations were analysed with amulti-line magnetic diagnostic technique and modelled in detail with a MagneticDoppler imaging code. We present a new set of mean longitudinal magnetic fieldmeasurements and derive a revised stellar rotational period. We alsoredetermine the basic stellar atmospheric parameters. Our four Stokes parametermagnetic inversions reveal a moderately complex surface field topology with amean field strength of 18 kG and a maximum local strength of 24 kG. A poloidaldipolar component dominates the magnetic energy spectrum of the surface fieldin HD119419. However, significant contributions of the higher-order sphericalharmonic components are also present. We show that the dipole plus quadrupolepart of the reconstructed field geometry is incapable of reproducing theobserved amplitudes and shapes of the Stokes Q and U profiles. The chemicalabundance distributions of Fe, Cr, Ti, and Nd, derived self-consistently withthe magnetic field geometry, are characterised by large abundance gradients anda lack of clear correlation with the magnetic field structure. This full Stokesvector analysis of HD119419 extends the modern hot-star magnetic mappinginvestigations to an open cluster Ap star with a well-determined age.

Magnetic field topology and chemical spot distributions of the Ap star HD119419