Query : 2008A&A...488..161C

2008A&A...488..161C - Astronomy and Astrophysics, volume 488, 161-165 (2008/9-2)

Chaos in models of the solar neighbourhood.


Abstract (from CDS):

We quantify the amount of chaos that exists in the local phase space. A sample of orbits from four different models of the solar neighbourhood phase space are analysed by a new chaos identification (and quantification) technique. While three of the models we used bear the signature of the perturbation due to both the Galactic bar and the spiral pattern, the last of the models is a bar-only one. We explore the models by comparing the corresponding values of chaos strength that are induced at the various energy levels.We find that all the viable models that have been demonstrated to successfully reproduce the local phase space structure - models that include the bar as well as the spiral - bear strong chaoticity, though the model that implies the highest degree of chaos is the one in which overlap of the major resonances of the bar and the spiral occurs. The bar-only model is found to display regularity. We advance chaos as primarily responsible for the splitting of the Hyades-Pleiades mode (the larger mode) of the local velocity distribution.

Abstract Copyright:

Journal keyword(s): chaos - Galaxy: solar neighbourhood

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 427 2
2 NAME Coma Berenices Moving Group MGr ~ ~           ~ 79 0
3 NAME Pleiades Moving Group MGr ~ ~           ~ 274 1
4 NAME Galactic Bar reg ~ ~           ~ 1164 0
5 NAME Hyades Moving Group MGr ~ ~           ~ 277 0

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