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Tidal streams of disrupted clusters are routinely detected in the halo of theMilky Way. It was recently shown that tidal streams of open clusters can nowalso be detected within the disc. In this work, we highlight the fact thattidal streams provide a powerful new diagnostic of the non-axisymmetric discpotential and may provide a new constraint on the pattern speed of the Galacticbar. In particular, we show how the stream-orbit misalignment for an opencluster on a quasi-circular orbit in the solar vicinity varies as a function ofthe position w.r.t the bar resonances. The angular shift rises beyondcorotation, reaching values as high as $30^\circ$ close to the outer Lindbladresonance (OLR), then dropping again and reversing its sign beyond the OLR. Weapplied this mechanism to the recently detected the Hyades stream. We note thatthe stream would be very similar when taking a potential with no bar or with afast pattern speed of 55 km.s$^{-1}$ kpc$^{-1}$. However, we find that thestream is different than previously detected when adopting a potential with abar pattern speed of $39$ km.s$^{-1}$ kpc$^{-1}$. Previously detected Hyadescandidate members would, on the other hand, favour a barless or a fast bargalaxy. Interestingly, the previously reported asymmetry in star counts withinthe leading and trailing tails of the Hyades tidal stream persists in allcases. Our study conclusively demonstrates that the effect of discnon-axisymmetries cannot be neglected when searching for tidal streams of openclusters and that current candidate members of the Hyades stream should not betrusted beyond a distance of 200 pc from the cluster. Moreover, our studyallows for ideal targets to be provided for high-resolution spectroscopyfollow-ups, which will enable conclusive identifications of the Hyades streamtrack and provide novel independent constraints on the bar pattern speed in theMW.

Impact of the Galactic bar on tidal streams within the Galactic disc: The case of the tidal stream of the Hyades