Journal Article

Velocity-space substructure from nearby RAVE and SDSS stars

Chang Hoon Hahn, J. A. Sellwood and Carlton Pryor

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 418, issue 4, pages 2459-2466
Published in print December 2011 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI:
Velocity-space substructure from nearby RAVE and SDSS stars

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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.

Keywords: stars: distances; Galaxy: disc; Galaxy: kinematics and dynamics; solar neighbourhood; Galaxy: structure; galaxies: spiral

Journal Article.  6055 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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