2016MNRAS.463.3768W


Query : 2016MNRAS.463.3768W

2016MNRAS.463.3768W - Mon. Not. R. Astron. Soc., 463, 3768-3782 (2016/December-3)

Bayesian analysis of two stellar populations in Galactic globular clusters- III. Analysis of 30 clusters.

WAGNER-KAISER R., STENNING D.C., SARAJEDINI A., VON HIPPEL T., VAN DYK D.A., ROBINSON E., STEIN N. and JEFFERYS W.H.

Abstract (from CDS):

We use Cycle 21 Hubble Space Telescope (HST) observations and HST archival ACS Treasury observations of 30 Galactic globular clusters to characterize two distinct stellar populations. A sophisticated Bayesian technique is employed to simultaneously sample the joint posterior distribution of age, distance, and extinction for each cluster, as well as unique helium values for two populations within each cluster and the relative proportion of those populations. We find the helium differences among the two populations in the clusters fall in the range of ∼0.04 to 0.11. Because adequate models varying in carbon, nitrogen, and oxygen are not presently available, we view these spreads as upper limits and present them with statistical rather than observational uncertainties. Evidence supports previous studies suggesting an increase in helium content concurrent with increasing mass of the cluster and we also find that the proportion of the first population of stars increases with mass as well. Our results are examined in the context of proposed globular cluster formation scenarios. Additionally, we leverage our Bayesian technique to shed light on the inconsistencies between the theoretical models and the observed data.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Hertzsprung-Russell and colour-magnitude diagrams - Galaxy: formation - globular clusters: general - globular clusters: general

Simbad objects: 33

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Number of rows : 33
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 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 958 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 979 0
3 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 451 0
4 NGC 2298 GlC 06 48 59.41 -36 00 19.1   10.77 8.89     ~ 447 0
5 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 768 0
6 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 372 0
7 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 753 0
8 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2333 0
9 NGC 5286 GlC 13 46 26.81 -51 22 27.3   9.18 8.31     ~ 389 0
10 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1836 0
11 M 107 GlC 16 32 31.86 -13 03 13.6   9.96 8.85     ~ 732 0
12 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 604 0
13 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 723 0
14 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1957 0
15 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 510 0
16 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1845 1
17 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 193 0
18 NGC 6535 GlC 18 03 50.51 -00 17 51.5   11.35 9.85     ~ 258 0
19 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 338 1
20 NGC 6584 GlC 18 18 37.60 -52 12 56.8   10.32 8.17     ~ 257 0
21 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 806 1
22 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 424 1
23 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 372 0
24 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1263 0
25 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 346 0
26 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 209 0
27 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 380 0
28 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 787 0
29 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1052 0
30 NGC 6934 GlC 20 34 11.37 +07 24 16.1   10.48 9.75     ~ 375 0
31 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 382 0
32 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2974 0
33 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 953 0

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2021.09.26-01:32:27

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