2021A&A...646A.125L

Query : 2021A&A...646A.125L

2021A&A...646A.125L - Astronomy and Astrophysics, volume 646A125-125 (2021/2-1)

The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXII. Relative ages of multiple populations in five globular clusters.

LUCERTINI F., NARDIELLO D. and PIOTTO G.

Abstract (from CDS):


Aims. We present a new technique to estimate the relative ages of multiple stellar populations hosted by the following five globular clusters: NGC 104 (47 Tuc), NGC 6121 (M 4), NGC 6352, NGC 6362, and NGC 6723.
Methods. We used the catalogs of the database HST UV Globular Cluster Survey to create color-magnitude and two-color diagrams of the globular clusters. We identified the multiple populations within each globular cluster, and we divided these into two main stellar populations: POPa, or first generation; and POPb, which is composed of all the successive generations of stars. This new technique allows us to obtain an accurate estimate of the relative ages between POPa and POPb.
Results. The multiple populations of NGC 104 and NGC 6121 are coeval within 220Myr and 214Myr, while those of NGC 6352, NGC 6362, and NGC 6723 are coeval within 336Myr, 474Myr, and 634Myr, respectively. These results were obtained combining all the sources of uncertainties.

Abstract Copyright: © ESO 2021

Journal keyword(s): techniques: photometric - stars: Population II - globular clusters: general

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NAME Mayall II GlC 00 32 46.5323801712 +39 34 40.504803060   14.564 13.807 13.208 12.684 ~ 400 1
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
5 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
6 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 317 0
7 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
8 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
9 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
10 NGC 6304 GlC 17 14 32.25 -29 27 43.3           ~ 394 0
11 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 425 0
12 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
13 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
14 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 492 0
15 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
16 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
17 NGC 6717 GlC 18 55 06.04 -22 42 05.3           ~ 273 0
18 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
19 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
20 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1

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