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The universality hypothesis: binary and stellar populations in star clusters and galaxies

Published online by Cambridge University Press:  27 April 2011

Pavel Kroupa
Pavel Kroupa*
Affiliation:
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany email: [email protected]
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Abstract

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It is possible to extract, from the observations, distribution functions of the birth dynamical properties of a stellar population, and to also infer that these are quite invariant to the physical conditions of star formation. The most famous example is the stellar IMF, and the initial binary population (IBP) seems to follow suit. A compact mathematical formulation of the IBP can be derived from the data. It has three broad parts: the IBP of the dominant stellar population (0.08–2M⊙), the IBP of the more-massive stars and the IBP of brown dwarfs. These three mass regimes correspond to different physical regimes of star formation but not to structure in the IMF. With this formulation of the IBP it becomes possible to synthesize the stellar-population of whole galaxies.

Keywords

stars: formationstars: low-mass, brown dwarfsstars: early-typestars: pre–main-sequencestars: luminosity function, mass functionbinaries: generalopen clusters and associations: generalgalaxies: star clustersgalaxies: stellar contentmethods: n-body simulations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S270: Computational Star Formation , May 2010 , pp. 141 - 149
Copyright
Copyright © International Astronomical Union 2011

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