Star clusters as simple stellar populations

  title={Star clusters as simple stellar populations},
  author={A. Gustavo Bruzual},
  journal={Philosophical Transactions of the Royal Society A},
  • A. G. Bruzual
  • Published 4 November 2009
  • Physics
  • Philosophical Transactions of the Royal Society A
In this paper, I review to what extent we can understand the photometric properties of star clusters, and of low-mass, unresolved galaxies, in terms of population-synthesis models designed to describe 'simple stellar populations' (SSPs), i.e. groups of stars born at the same time, in the same volume of space and from a gas cloud of homogeneous chemical composition. The photometric properties predicted by these models do not readily match the observations of most star clusters, unless we… 

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