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Conference Papers Year : 2000

The Impact of Tides on Star Cluster Formation


The homogeneity of metal abundances in clusters suggests that the epoch of star formation must have been {short} in order to avoid strong gradients in the stellar population, leading to systems with little velocity dispersion at formation. When {spherical clusters} undergo violent relaxation a good fraction of stars describe nearly radial orbits. This situation likely gives rise to triaxial instability (see e.g. Merritt 1999). Aspherical collapse also results in triaxial equilibria. However a net torque may now be exerted on individual clusters by the host galaxy's tide during radial infall, and induce streaming motion or rotation. We investigate analytically the collapse of uniform-density spheroids to which we apply model galactic tides. We find that sub-virial clusters non-rotating at birth may yet show appreciable rotation in equilibrium.
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insu-04054613 , version 1 (31-03-2023)



Christian Boily, Christophe Pichon. The Impact of Tides on Star Cluster Formation. Astronomische Gesellschaft Abstract Series, 2000, à renseigner, Unknown Region. 2000), p.266. ⟨insu-04054613⟩
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