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A stellar association is a very loose star cluster, whose stars share a common origin and are still moving together through space, but have become gravitationally unbound. Associations are primarily identified by their common movement vectors and ages. Identification by chemical composition is also used to factor in association memberships.
The regions with higher density of stars are shown; these correspond with known star clusters (Hyades and Coma Berenices) and moving groups. This is a list of nearby stellar associations and moving groups. A stellar association is a very loose star cluster, looser than an open cluster. A moving group is the remnant of such a stellar association ...
Below are lists of the most massive known star clusters in solar masses (M ☉) and sorted in descending order. Methods for mass estimation. Globular cluster
Star cluster - full article Encyclopædia Britannica, Super Star Cluster Discovered in Our Own Milky Way; Probing the Birth of Super Star Clusters: Implications for Massive Star Formation, Kelsey E. Johnson, 2005; A new population of extended, luminous star clusters in the halo of M31, A.P. Huxor et al., 2004
This is a list of open clusters located in the Milky Way. An open cluster is an association of up to a few thousand stars that all formed from the same giant molecular cloud . There are over 1,000 known open clusters in the Milky Way galaxy, but the actual total may be up to ten times higher. [ 1 ]
The moving-cluster method relies on observing the proper motions and Doppler shift of each member of a group of stars known to form a cluster. The idea is that since all the stars share a common space velocity, they will appear to move towards a point of common convergence ("vanishing point") on the sky.
Consider a Mach-1 BH, which travels initially at the sound speed =, hence its Bondi radius satisfies = = = (), where the sound speed is = with the prefactor = fixed by the fact that for a uniform spherical cluster of the mass density = (), half of a circular period is the time for "sound" to make a oneway crossing in its longest dimension ...
A stellar association is a very loose star cluster, looser than both open clusters and globular clusters. Stellar associations will normally contain from 10 to 100 or more visible stars. An association is primarily identified by commonalities in its member stars' movement vectors, ages, and chemical compositions.