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The kinematic properties of stars in an oscillating Kuzmin disk |
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| Authors: | Yan-ning Fu Yi-sui Sun |
| Institution: | a Department of Astronomy, Nanjing University, Nanjing 210008, China b Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China |
| Abstract: | We study the kinematic properties of stars under the combined potential of a Kuzmin disk with a simple radial oscillation and a logarithmic halo. The results are: 1) There exist stable, ordered and near-circular orbits. 2) The effect of the oscillating disk is greater on orbits with smaller angular momenta and on that departly greatly from the near-circular orbits. 3) Most of the motion in the disk is ordered motion. 4) Orbits that depart greatly from the near-circular orbits generally have chaotic motion and may eventually escape. But the actual fraction escaped in one Hubble time is small. 5) Disk oscillation may be one of the mechanisms for the formation and long-term maintenance of some star clusters; the larger the amplitude, the greater may be the number of clusters; for a given disk galaxy, there may be more clusters with small than with large angular momenta. |
| Keywords: | celestial mechanics galaxy dynamics galaxy oscillation |
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