1998/02/20 by D. Raboud, M. Grenon, Raboud, D. +7
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9802266
Letter (4 pages, 6 figures). Revised version: modifications in the text and in figure 1. Accepted for publication in A&A Letters
openalex publication_date 1998/02/20 · arxiv created 1998/05/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.