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Dynamics of primordial binary stars in multiple-population globular clusters

Published online by Cambridge University Press:  07 March 2016

Jongsuk Hong ,
Enrico Vesperini ,
Antonio Sollima ,
Steve McMillan ,
Franca D'Antona  and
Annibale D'Ercole
Jongsuk Hong
Affiliation:
Department of Astronomy, Indiana University, Bloomington, IN, 47401, USA
Enrico Vesperini
Affiliation:
Department of Astronomy, Indiana University, Bloomington, IN, 47401, USA
Antonio Sollima
Affiliation:
INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy
Steve McMillan
Affiliation:
Department of Physics, Drexel University, Philadelphia, PA 19104, USA
Franca D'Antona
Affiliation:
INAF – Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio, Italy
Annibale D'Ercole
Affiliation:
INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy
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Abstract

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We have performed a survey of N-body simulations to explore the dynamics of primordial binaries in multiple-population globular clusters. We show that, as a consequence of the initial differences between the spatial distribution of first-generation (FG) and second-generation (SG) stars, SG binaries are disrupted more efficiently than FG binaries. The effects of dynamical evolution on the surviving binaries produces a difference between the SG and the FG binary binding energy distribution with the SG population characterized by a larger fraction of high binding energy (more bound) binaries. We also explore the evolution of the radial variation of the SG-to-FG binary number ratio and find that although the global binary fraction decreases more rapidly for the SG population, the local binary fraction measured in the cluster inner regions may still be dominated by SG binaries.

Keywords

globular clusters : general – stars : chemically peculiar
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S312: Star Clusters and Black Holes in Galaxies across Cosmic Time , August 2014 , pp. 237 - 238
Copyright
Copyright © International Astronomical Union 2016 

References

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