Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/32345
Title: | Monte Carlo simulations of multiple populations in globular clusters: constraints on the initial size of the second generation from binary stars | Authors: | SOLLIMA, ANTONIO LUIGI GRATTON, Raffaele LUCATELLO, Sara CARRETTA, Eugenio |
Issue Date: | 2022 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 512 | Issue: | 1 | First Page: | 776 | Abstract: | We present the result of a survey of Monte Carlo simulations of globular clusters hosting two generations of stars including a large (f_b=50%) fraction of primordial binaries in both populations. The dynamical evolution of the two stellar populations is followed for a Hubble time taking into account the effect of the tidal field, two-body relaxation, stellar evolution and three/four-bodies interactions. The fraction of surviving binaries, once accounted for the observational bias and uncertainties, is compared with the available radial velocity time-series performed in real globular clusters, and it is used to constrain the initial spatial concentration of the second generation. The fraction of second generation binaries appears to depend only on the ratio between the total cluster mass and the initial size of the second generation which determines the average velocity dispersion across the extent of this stellar population. In spite of the various uncertainties, we find that the observed fraction can be obtained only assuming a strong initial concentration of the second generation (r_h,S~ 0.1 (M/10^6 M_s) pc). The evolution of the first generation binary fraction is more sensitive to the tidal field strength (with a non negligible effect of the cluster orbital eccentricity) since the tidal field has a direct impact on the first generation structural properties. | URI: | http://hdl.handle.net/20.500.12386/32345 | URL: | https://academic.oup.com/mnras/article/512/1/776/6541853 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stac428 | Bibcode ADS: | 2022MNRAS.512..776S | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
stac428.pdf | Pdf editoriale | 1.6 MB | Adobe PDF | View/Open |
Page view(s)
48
checked on Sep 20, 2024
Download(s)
20
checked on Sep 20, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.