2020ApJ...891...37O


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.25CEST09:13:45

2020ApJ...891...37O - Astrophys. J., 891, 37-37 (2020/March-1)

The Hubble Space Telescope UV legacy survey of Galactic globular clusters. XX. Ages of single and multiple stellar populations in seven bulge globular clusters.

OLIVEIRA R.A.P., SOUZA S.O., KERBER L.O., BARBUY B., ORTOLANI S., PIOTTO G., NARDIELLO D., PEREZ-VILLEGAS A., MAIA F.F.S., BICA E., CASSISI S., D'ANTONA F., LAGIOIA E.P., LIBRALATO M., MILONE A.P., ANDERSON J., APARICIO A., BEDIN L.R., BROWN T.M., KING I.R., MARINO A.F., PIETRINFERNI A., RENZINI A., SARAJEDINI A., VAN DER MAREL R. and VESPERINI E.

Abstract (from CDS):

In the present work we analyzed seven globular clusters (GCs) selected from their location in the Galactic bulge and with metallicity values in the range -1.30 <= [Fe/H] <= -0.50. The aim of this work is first to derive cluster ages assuming single stellar populations and second to identify the stars from first (1G) and second generations (2G) from the main sequence, subgiant, and red giant branches, and to derive their age differences. Based on a combination of UV and optical filters used in this project, we apply the Gaussian mixture models to distinguish the multiple stellar populations. Applying statistical isochrone fitting, we derive self-consistent ages, distances, metallicities, and reddening values for the sample clusters. An average age of 12.3 ± 0.4 Gyr was obtained both using DSED and BaSTI (accounting atomic diffusion effects) isochrones, without a clear distinction between the moderately metal-poor and the more metal-rich bulge clusters, except for NGC 6717 and the inner halo NGC 6362 with ∼13.5 Gyr. We derived a weighted mean age difference between the multiple populations hosted by each GC of 41 ± 170 Myr adopting canonical He abundances; whereas for higher He in 2G stars, this difference reduces to 17 ± 170 Myr, but with individual uncertainties of 500 Myr.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Globular star clusters - Galactic bulge

Simbad objects: 34

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Number of rows : 34

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 927 0
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1248 0
3 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 818 0
4 IRAS 09110-6439 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1252 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3020 0
6 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 241 0
7 NGC 6304 GlC 17 14 32.25 -29 27 43.3   10.33 9.03     ~ 300 0
8 NGC 6325 GlC 17 17 59.27 -23 45 57.7   11.49       ~ 140 0
9 NGC 6355 GlC 17 23 58.65 -26 21 12.3   12.46 11.05     ~ 126 0
10 NGC 6352 GlC 17 25 29.11 -48 25 19.8   9.95 8.87     ~ 341 0
11 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 131 0
12 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 491 0
13 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 809 1
14 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11679 0
15 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 771 0
16 NGC 6453 GlC 17 50 51.77 -34 35 55.1   10.49       ~ 130 0
17 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 183 0
18 ESO 456-38 GlC 18 01 49.10 -27 49 33.0           ~ 57 0
19 ESO 521-16 GlC 18 02 57.40 -26 04 00.0           ~ 73 0
20 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 455 1
21 NGC 6558 GlC 18 10 18.38 -31 45 48.6   12.39 11.29     ~ 179 0
22 NGC 6569 GlC 18 13 38.88 -31 49 35.2   10.78 9.47     ~ 188 0
23 ESO 456-78 GlC 18 14 06.600 -28 38 06.00           ~ 34 0
24 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 779 1
25 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 664 0
26 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 407 1
27 NGC 6642 GlC 18 31 54.23 -23 28 34.1   11.30 10.24     ~ 162 0
28 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 352 0
29 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1223 0
30 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 195 0
31 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 432 0
32 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1815 0
33 NAME Galactic Bar reg ~ ~           ~ 908 0
34 NAME Galactic Bulge reg ~ ~           ~ 3432 0

    Equat.    Gal    SGal    Ecl

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2020.09.25-09:13:45

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