Morphology of bar orbits

Details Morphology of bar orbits Morphology of bar orbits

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..328a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 2, p. 328-344.

Astronomy and Astrophysics

Astronomy

200

Barred Galaxies, Galactic Rotation, Galactic Structure, Stellar Motions, Astronomical Models, Celestial Mechanics

Scientific paper

The periodic orbits in a barred galaxy model potential are studied, with emphasis placed on the families that are relevant to the gas flow within the bar. This model has four free parameters, namely, its central concentration and the axial ratio, quadrupole moment, and pattern speed of its bar. The existence and extent of the families x2 and x3 are examined for realistic values of the free parameters of the model, and two different definitions of the inner Lindblad resonance in strong bar models are compared. The types of the 4/1 gap and the radii and stability of the Lagrangian points are presented as a function of the same parameters. In the central parts of the galaxy the orbits of the x1 family are nearly circular. Their axial ratio increases with the size of the orbit, to reach a maximum value between 2 and 8, and then drops. The influence of the free parameters of the model on the position and value of the maximum is also examined.

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