Spiral windows for escaping stars
Depto. de Matemática A., University of Alicante, PO Box 99, 03080, Alicante, Spain
2 Dépt. de Mathématique, University of Namur, 8 rempart de la Vierge, 5000, Namur, Belgium
Corresponding author: J. Henrard, email@example.com
Accepted: 23 January 2001
The "escape windows"through which stars may escape from a galaxy are investigated by means of Poincaré sections of a simplified axi-symmetric model of the potential. The spiral shape of the windows are analyzed in details by constructing a normal form in the vicinity of an unstable periodic orbit.
Key words: celestial mechanics / galaxies: clusters: general / galaxies: general
© ESO, 2001