Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-08-29
Astronomy and Astrophysics
Astrophysics
12 pages, Latex, Invited contribution at the IAU Colloquium 157, ``Barred Galaxies'', Tuscaloosa, 30 May-June 3, 1995
Scientific paper
Recent observational constraints restrict the strict applicability of stellar dynamics in spirals to a few rotation periods. However, stellar dynamics concepts such as periodic orbits are invaluable for understanding the various dynamical processes occurring during much more periods. A distinction of two instability types in stellar systems is pointed out, the first one being well illustrated by the bar instability, and the second one by the bar bending instability. In bars the third dimension brings essential dynamical effects which modify the views about the history of bulges and the spiral secular evolution. Bars may grow, bend, thicken, and dissolve into spheroidal bulges, and spirals may evolve along the Hubble sequence in the sense Sd$\to$Sa. This leads to a much more dynamical picture of isolated galaxies than imagined before.
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