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http://hdl.handle.net/20.500.12386/26226
Titolo: | Refining the dynamical clock for star clusters | Autori: | Lanzoni, B. Ferraro, F. R. Alessandrini, E. Dalessandro, Emanuele Vesperini, E. Raso, S. |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 833 | Fascicolo: | 2 | Da pagina:: | L29 | Abstract: | We used a sample of 25 Galactic globular clusters to empirically measure the parameter A + recently introduced by Alessandrini et al., and defined as the area enclosed between the cumulative radial distribution of blue straggler stars (BSSs) and that of a reference population. Based on N-body simulations, this parameter is expected to efficiently measure the level of BSS central segregation. Observationally, for a proper cluster-to-cluster comparison we use {A}{rh}+, I.e., the value of the parameter determined out to the half-mass radius in each system. We find that {A}{rh}+ nicely correlates with the position of the minimum of the BSS normalized radial distribution and with the cluster central relaxation time. This demonstrates that it is a sensitive indicator of the cluster dynamical age as traced by the spatial segregation of the BSS population. In the context of the “stellar system dynamical clock,” this parameter provides a new clock-hand, which is easier to determine observationally and allows a more robust measure of the cluster dynamical age. | URI: | http://hdl.handle.net/20.500.12386/26226 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/833/2/L29 | ISSN: | 2041-8205 | DOI: | 10.3847/2041-8213/833/2/L29 | Bibcode ADS: | 2016ApJ...833L..29L | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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