Journal article
Binary star disruption in globular clusters with multiple stellar populations
Monthly notices of the Royal Astronomical Society, v 416(1), pp 355-360
01 Sep 2011
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Abstract
The discovery of multiple stellar populations in globular clusters raises fundamental questions concerning the formation and dynamical history of these systems. In a previous study aimed at exploring the formation of second-generation (SG) stars from the ejecta of first-generation (FG) asymptotic giant branch stars, and the subsequent dynamical evolution of the cluster, we showed that SG stars are expected to form in a dense subsystem concentrated in the inner regions of the FG cluster. In this paper we explore the implications of the structural properties of multiple-population clusters, and in particular the presence of the inner SG subsystem, for the disruption of binary stars. We quantify the enhancement of the binary disruption rate due to the presence of the central SG subsystem for a number of different initial conditions. Our calculations show that SG binaries, which are assumed to be more concentrated in the cluster inner regions, are disrupted at a substantially larger rate than FG binaries. Assuming a similar initial fraction of FG and SG binaries, our dynamical study indicates that the SG population is now expected to contain a significantly smaller binary fraction than the FG population.
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Details
- Title
- Binary star disruption in globular clusters with multiple stellar populations
- Creators
- Enrico Vesperini - Drexel UniversityStephen L. W. McMillan - Drexel UniversityFrancesca D'Antona - National Institute for AstrophysicsAnnibale D'Ercole - Osservatorio astronomico di Bologna
- Publication Details
- Monthly notices of the Royal Astronomical Society, v 416(1), pp 355-360
- Publisher
- Oxford Univ Press
- Number of pages
- 6
- Grant note
- PRIN-INAF; Istituto Nazionale Astrofisica (INAF); Ministry of Education, Universities and Research (MIUR); Research Projects of National Relevance (PRIN)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000294017000030
- Scopus ID
- 2-s2.0-80051818557
- Other Identifier
- 991019167556604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics