Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-03-02
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
13 pages and 6 figures based on 14 .eps files
Scientific paper
We investigate the evolution of young star clusters using N-body simulations. We confirm that subvirial and fractal-structured clusters will dynamically mass segregate on a short timescale (within 0.5 Myr). We adopt a modified minimum-spanning-tree (MST) method to measure the degree of mass segregation, demonstrating that the stars escaping from a cluster's potential are important for the temporal dependence of mass segregation in the cluster. The form of the initial velocity distribution will also affect the degree of mass segregation. If it depends on radius, the outer parts of the cluster would expand without undergoing collapse. In velocity space, we find 'inverse mass segregation,' which indicates that massive stars have higher velocity dispersions than their lower-mass counterparts.
Chen Leon L.
de Grijs Richard
Yu Jincheng
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