Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997acasn..38..119f&link_type=abstract
Acta Astronomica Sinica, vol. 38, p. 119
Astronomy and Astrophysics
Astronomy
Stellar Motions, Circular Orbits, Stellar Oscillations, Angular Momentum, Stellar Orbits, Star Clusters, Star Formation, Chaos, Eccentric Orbits, Disk Galaxies
Scientific paper
We study the motion properties of stars in the disk plane of an oscillating Kuzmin disk. Near-circular orbits are found to exist, most of which are stable and ordered. The effects of disk oscillation on stars either with smaller angular momenta or with larger eccentricity orbits are larger than those on stars either with larger angular momenta or with smaller eccentricity orbits, respectively. Most of the stars of the Kuzmin disk move regularly. The stars in orbits with large eccentricities are generally in chaotic motions and may eventually escape from the galaxy. Only a small proportion of stars has escape time shorter than the Hubble time. Disk oscillation is a possible mechanism for the formation and maintenance of star clusters. It is plausible that there is a correlation between the number of star clusters and the amplitude of disk oscillation. This implies that a disk galaxy with larger amplitude of disk oscillation tends to possess more star clusters.
Fu Yan-Ning
Sun Yi-Sui
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