SIMBAD references

2011MNRAS.410L...6G - Mon. Not. R. Astron. Soc., 410, L6-L7 (2011/January-1)

The distinction between star clusters and associations.


Abstract (from CDS):

In Galactic studies a distinction is made between (open) star clusters and associations. For barely resolved objects at a distance of several Mpc, this distinction is not trivial to make. Here we provide an objective definition by comparing the age of the stars to the crossing time of nearby stellar agglomerates. We find that a satisfactory separation can be made where this ratio equals unity. Stellar agglomerates for which the age of the stars exceeds the crossing time are bound, and are referred to as star clusters. Alternatively, those for which the crossing time exceeds the stellar age are unbound and are referred to as associations. This definition is useful whenever reliable measurements for the mass, radius and age are available.

Abstract Copyright: 2010 The Authors. Monthly Notices of the Royal Astronomical Society2010 RAS

Journal keyword(s): stars: formation - open clusters and associations: general - galaxies: star clusters: general

Simbad objects: 43

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