2019ApJ...884L..24D


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.06CEST00:59:08

2019ApJ...884L..24D - Astrophys. J., 884, L24-L24 (2019/October-2)

A family picture: tracing the dynamical path of the structural properties of multiple populations in globular clusters.

DALESSANDRO E., CADELANO M., VESPERINI E., MARTOCCHIA S., FERRARO F.R., LANZONI B., BASTIAN N., HONG J. and SANNA N.

Abstract (from CDS):

We studied the spatial distributions of multiple stellar populations (MPs) in a sample of 20 globular clusters (GCs) spanning a broad range of dynamical ages. The differences between first-population (FP) and second-population (SP) stars were measured by means of the parameter A+, defined as the area enclosed between their cumulative radial distributions. We provide the first purely observational evidence of the dynamical path followed by MPs from initial conditions toward a complete FP-SP spatial mixing. Less dynamically evolved clusters have SP stars more centrally concentrated than FPs, while in more dynamically evolved systems the spatial differences between FP and SP stars decrease and eventually disappear. By means of an appropriate comparison with a set of numerical simulations, we show that these observational results are consistent with the evolutionary sequence expected by the long-term dynamical evolution of clusters forming with an initially more centrally concentrated SP subsystem. This result is further supported by the evidence of a trend between A+ and the stage of GC dynamical evolution inferred by the ratio between the present-day and the initial mass of the cluster.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Globular star clusters - Star clusters - Hertzsprung Russell diagram - Giant branch - HST photometry - Broad band photometry - Dynamical evolution

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 284 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9780 1
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 950 0
4 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 973 0
5 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 444 0
6 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1279 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15333 1
8 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 280 0
9 NGC 2808 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1289 0
10 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2310 0
11 NGC 5286 GlC 13 46 26.81 -51 22 27.3   9.18 8.31     ~ 383 0
12 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 642 0
13 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 252 0
14 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 505 0
15 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 336 1
16 NGC 6584 GlC 18 18 37.60 -52 12 56.8   10.32 8.17     ~ 256 0
17 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 798 1
18 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 420 1
19 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 366 0
20 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 344 0
21 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 943 0
22 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 206 0
23 NGC 6934 GlC 20 34 11.37 +07 24 16.1   10.48 9.75     ~ 374 0
24 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2957 0

    Equat.    Gal    SGal    Ecl

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2021.05.06-00:59:08

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