The Distribution of Nearby Stars in Velocity Space

Details The Distribution of Nearby Stars in Velocity Space The Distribution of Nearby Stars in Velocity Space

1998-10-20

arxiv.org/abs/astro-ph/9810320v1

Astronomy and Astrophysics

Astrophysics

4 pages LaTeX, uses paspconf.sty, to appear in the proceedings of "Galaxy Dynamics", conference held in Rutgers, 08/98

Scientific paper

From the tangential velocities of stars all over the sky, one can, in a statistical way, infer their 3D velocity distribution. An application to Hipparcos data reveals rich structure in the planar stellar motions: there are several moving groups, increasing in number with stellar type but decreasing in importance. A distinct group of outward moving stars with low rotation velocities might be associated with the Galactic bar: growing a bar in a smooth model for the Galactic disk results in such a group, provided the Sun is outside the outer Lindblad resonance (OLR) and the orientation angle with the bar is in the first quadrant. The vertical motions show less structure, but the mean increases for large rotational velocities, which can be nicely explained by a warp of the outer stellar disk.

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