SIMBAD references

2016ApJ...833L..29L - Astrophys. J., 833, L29-L29 (2016/December-3)

Refining the dynamical clock for star clusters.

LANZONI B., FERRARO F.R., ALESSANDRINI E., DALESSANDRO E., VESPERINI E. and RASO S.

Abstract (from CDS):

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 Arh+, i.e., the value of the parameter determined out to the half-mass radius in each system. We find that Arh+ 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.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): globular clusters: general - methods: observational - stars: kinematics and dynamics - stars: kinematics and dynamics

Simbad objects: 29

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2021.04.13-05:34:20

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