Velocity-space substructure from nearby RAVE and SDSS stars

Abstract

We extract a sample of disc stars within 200 pc of the Sun from the RAVE and SDSS surveys. Distances are estimated photometrically and proper motions are from ground-based data. We show that the velocity-space substructure first revealed in the Geneva-Copenhagen sample is also present in this completely independent sample. We also evaluate action-angle variables for these stars and show that the Hyades stream stars in these data are again characteristic of having been scattered at a Lindblad resonance. Unfortunately, analysis of such local samples can determine neither whether it is an inner or an outer Lindblad resonance, nor the multiplicity of the pattern.

Included copy editor's corrections. Accepted to appear in MNRAS. 9 pages, 11 figures, uses mn2e LaTeX

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• Modelling the Galactic disc: perturbed distribution functions in the presence of spiral arms
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• Thick disk kinematics from RAVE and the solar motion
• Thin disk kinematics from RAVE and the solar motion
• Identifying resonances of the Galactic bar in Gaia DR2: II. Clues from angle space
• Extending the Hyades
• Probabilities for Solar Siblings
• NGC 1252: a high altitude, metal poor open cluster remnant