Velocity-space substructure from nearby RAVE and SDSS stars

Authors

  • Chang Hoon Hahn,

    Corresponding author
    1. Rutgers University, Department of Physics & Astronomy, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA
      E-mail: chahah@eden.rutgers.edu (CHH); sellwood@physics.rutgers.edu (JAS); pryor@physics.rutgers.edu (CP)
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  • J. A. Sellwood,

    Corresponding author
    1. Rutgers University, Department of Physics & Astronomy, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA
      E-mail: chahah@eden.rutgers.edu (CHH); sellwood@physics.rutgers.edu (JAS); pryor@physics.rutgers.edu (CP)
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  • Carlton Pryor

    Corresponding author
    1. Rutgers University, Department of Physics & Astronomy, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA
      E-mail: chahah@eden.rutgers.edu (CHH); sellwood@physics.rutgers.edu (JAS); pryor@physics.rutgers.edu (CP)
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E-mail: chahah@eden.rutgers.edu (CHH); sellwood@physics.rutgers.edu (JAS); pryor@physics.rutgers.edu (CP)

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, the analysis of such local samples can determine neither whether it is an inner or an outer Lindblad resonance, nor the multiplicity of the pattern.

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