Velocity-space substructure from nearby RAVE and SDSS stars

Authors:
  • CHChang Hoon Hahn
    Chang Hoon Hahn
  • JSJ. A. Sellwood
    J. A. Sellwood
  • CPCarlton Pryor
    Carlton Pryor
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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 constrain neither whether it is an inner or an outer Lindblad resonance, nor the multiplicity of the pattern.