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We report on interferometric AMBER/VLTI observations of the recurrent nova RSOph five days after its outburst on 2006 Feb 12. Using three baselines from 44to 86m, and a spectral resolution of 1500, we measured the extension of theemission in the K band continuum and in the BrG and HeI2.06 micron lines. Thecontinuum visibilities were interpreted by fitting simple geometric modelsconsisting of uniform and Gaussian ellipses, ring and binary models. Thevisibilities and differential phases in the BrG line were interpreted usingskewed ring models aiming to perform a limited parametric reconstruction of theextension and kinematics of the line forming region. The limited uv coveragedoes not allow discrimination between filled models and rings. Binary modelsare discarded because the measured closure phase in the continuum is close tozero. The visibilities in the lines are at a low level compared to their nearbycontinuum, consistent with a more extended line forming region for HeI2.06 thanBrG. The ellipse models for the continuum and for the lines are highlyflattened and share the same position angle. Two radial velocity fields areapparent in the BrG line: a 'slow' expanding ring-like structure (v~1800km/s),and a 'fast' structure extended in the E-W direction (v~2500-3000km/s). Theseresults confirm the basic fireball model, contrary to the conclusions of otherinterferometric observations conducted by Monnier et al. (2006).Comment: Accepted in A&

AMBER/VLTI interferometric observations of the recurrent Nova RS Ophiuchii 5.5 days after outburst