2018MNRAS.475.4088L


Query : 2018MNRAS.475.4088L

2018MNRAS.475.4088L - Mon. Not. R. Astron. Soc., 475, 4088-4103 (2018/April-2)

The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XII. The RGB bumps of multiple stellar populations.

LAGIOIA E.P., MILONE A.P., MARINO A.F., CASSISI S., APARICIO A.J., PIOTTO G., ANDERSON J., BARBUY B., BEDIN L.R., BELLINI A., BROWN T., D'ANTONA F., NARDIELLO D., ORTOLANI S., PIETRINFERNI A., RENZINI A., SALARIS M., SARAJEDINI A., VAN DER MAREL R. and VESPERINI E.

Abstract (from CDS):

The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters is providing a major breakthrough in our knowledge of globular clusters (GCs) and their stellar populations. Among the main results, we discovered that all the studied GCs host two main discrete groups consisting of first generation (1G) and second generation (2G) stars. We exploit the multiwavelength photometry from this project to investigate, for the first time, the Red Giant Branch Bump (RGBB) of the two generations in a large sample of GCs. We identified, with high statistical significance, the RGBB of 1G and 2G stars in 26 GCs and found that their magnitude separation as a function of the filter wavelength follows comparable trends. The comparison of observations to synthetic spectra reveals that the RGBB luminosity depends on the stellar chemical composition and that the 2G RGBB is consistent with stars enhanced in He and N and depleted in C and O with respect to 1G stars. For metal-poor GCs the 1G and 2G RGBB relative luminosity in optical bands mostly depends on helium content, Y. We used the RGBB observations in F606W and F814W bands to infer the relative helium abundance of 1G and 2G stars in 18 GCs, finding an average helium enhancement ΔY = 0.011 ± 0.002 of 2G stars with respect to 1G stars. This is the first determination of the average difference in helium abundance of multiple populations in a large number of clusters and provides a lower limit to the maximum internal variation of helium in GCs.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: abundances - stars: evolution - Hertzsprung-Russell and colour-magnitude diagrams - stars: luminosity function, mass function - stars: Population II

Simbad objects: 58

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Number of rows : 58
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3752 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 993 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1020 0
4 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 477 0
5 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1343 0
6 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 465 0
7 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 885 0
8 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1346 0
9 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 804 0
10 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 942 0
11 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 390 0
12 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 780 0
13 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 584 0
14 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3266 0
15 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2385 0
16 NGC 5286 GlC 13 46 26.81 -51 22 27.3   9.18 8.31     ~ 408 0
17 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 786 0
18 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 365 0
19 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1889 0
20 NGC 5927 GlC 15 28 00.69 -50 40 22.9   10.13 8.86     ~ 435 0
21 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 341 0
22 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 673 0
23 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1772 0
24 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 268 0
25 NGC 6144 GlC 16 27 13.86 -26 01 24.6   10.55 9.63     ~ 226 0
26 M 107 GlC 16 32 31.86 -13 03 13.6   9.96 8.85     ~ 753 0
27 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2117 0
28 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 629 0
29 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 749 0
30 NGC 6304 GlC 17 14 32.25 -29 27 43.3   10.33 9.03     ~ 332 0
31 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2009 0
32 NGC 6352 GlC 17 25 29.11 -48 25 19.8   9.95 8.87     ~ 373 0
33 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 287 0
34 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 542 0
35 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 868 1
36 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1894 1
37 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 836 0
38 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 208 0
39 NGC 6535 GlC 18 03 50.51 -00 17 51.5   11.35 9.85     ~ 272 0
40 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 350 1
41 NGC 6584 GlC 18 18 37.60 -52 12 56.8   10.32 8.17     ~ 269 0
42 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 834 1
43 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 441 1
44 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 397 0
45 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1306 0
46 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 358 0
47 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1009 0
48 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 224 0
49 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 473 0
50 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1911 0
51 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 397 0
52 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 813 0
53 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1079 0
54 NGC 6934 GlC 20 34 11.37 +07 24 16.1   10.48 9.75     ~ 393 0
55 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 397 0
56 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 3039 0
57 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 972 1
58 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 988 0

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2022.10.07-05:17:24

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