Journal article
Evolution of binary stars in multiple-population globular clusters
Monthly notices of the Royal Astronomical Society, v 449(1), pp 629-638
01 May 2015
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The discovery of multiple stellar populations in globular clusters has implications for all the aspects of the study of these stellar systems. In this paper, by means of N-body simulations, we study the evolution of binary stars in multiple-population clusters and explore the implications of the initial differences in the spatial distribution of different stellar populations for the evolution and survival of their binary stars. Our simulations show that initial differences between the spatial distribution of first-generation (FG) and second-generation (SG) stars can leave a fingerprint in the current properties of the binary population. SG binaries are disrupted more efficiently than those of the FG population resulting in a global SG binary fraction smaller than that of the FG. As for surviving binaries, dynamical evolution 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 have also studied the dependence of the binary properties on the distance from the cluster centre. 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. The extent of the differences between the surviving FG and SG binary binding energy distribution also varies radially within the cluster and is larger in the cluster inner regions.
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Details
- Title
- Evolution of binary stars in multiple-population globular clusters
- Creators
- Jongsuk Hong - Indiana UniversityEnrico Vesperini - Indiana UniversityAntonio Sollima - Osservatorio astronomico di BolognaStephen L. W. McMillan - Drexel UniversityFranca D'Antona - INAF Osservatorio Astron Roma, I-00040 Monte Porzio Catone, ItalyAnnibale D'Ercole - Osservatorio astronomico di Bologna
- Publication Details
- Monthly notices of the Royal Astronomical Society, v 449(1), pp 629-638
- Publisher
- Oxford Univ Press
- Number of pages
- 10
- Grant note
- Indiana METACyt Initiative PRIN MIUR; Ministry of Education, Universities and Research (MIUR); Research Projects of National Relevance (PRIN) Lilly Endowment, Inc.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000355345600047
- Scopus ID
- 2-s2.0-84930841332
- Other Identifier
- 991019167427304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics