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Evidence for a signature of the galactic bar in the solar neighbourhood
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Using available kinematical data for a subsample of NLTT stars from the HIPPARCOS mission we confirm the existence of a previously reported local anomaly in the (u,v) plane: the mean motion u for old disc stars, with v < -30 km/s, is largely positive (+19 +/- 9 km/s w.r.t. the Galactic Center). With the use of the newest global self-consistent numerical models of our Galaxy, we show that a bar could be responsible for this observed velocity anomaly. A fraction of our stars have bar perturbed ``hot'' orbits, allowing them to erratically wander from inside the bar to regions outside the corotation, in particular through the solar neighbourhood.
Forward citations
Cited by 2 Pith papers
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On the origin of the Hercules group: I. chemical signatures indicating the outer bar origin
The low-angular-momentum Hercules III and IV subgroups, after removing high-alpha thick disk stars, show iron-peak and Odd-Z enhancements that suggest an origin near the Milky Way's outer bar.
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Wrinkles in Time. II. Stellar Age Trends in Kinematic Signatures from Transient Spiral Structure
Simulations show Lindblad-resonance wrinkles from non-winding spirals are filled with zero-age stars on orbits normally occupied by much older populations, offering an age-based constraint on past transient spiral patterns.
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