An ancient system hidden in the Galactic plane?
We analyse high signal-to-noise ESPaDOnS/CFHT spectra of 20 very metal-poor (VMP) stars ([Fe/H] $\,\lt\,-2.0$) in the solar neighbourhood (within $\sim 2$ kpc), selected to be on planar orbits with maximum heights $\lesssim 4$ kpc. The sample comprises 11 stars on prograde and 9 on retrograde orbits, all with relatively high eccentricities (0.5─0.9
Sestito, Federico et al.
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2026