Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915115v&link_type=abstract
American Astronomical Society, AAS Meeting #219, #151.15
Astronomy and Astrophysics
Astronomy
Scientific paper
A number spectroscopic and photometric studies have provided strong evidence of the presence of multiple stellar populations in globular clusters and raised many fundamental questions concerning the formation and dynamical history of these systems. In a previous investigation 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. Here we present the results of a study aimed at exploring the long-term dynamical evolution of multiple-population clusters and the implications of 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.
D'Antona Francesca
D'Ercole Annibale
McMillan Stephen L. W.
Vesperini Enrico
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