2021ApJ...906...76D


Query : 2021ApJ...906...76D

2021ApJ...906...76D - Astrophys. J., 906, 76-76 (2021/January-2)

Multiple stellar populations along the red horizontal branch and red clump of globular clusters.

DONDOGLIO E., MILONE A.P., LAGIOIA E.P., MARINO A.F., TAILO M., CORDONI G., JANG S. and CARLOS M.

Abstract (from CDS):

We exploit multiband Hubble Space Telescope photometry to investigate multiple populations (MPs) along the red horizontal branches (HBs) and red clumps of 14 metal-rich globular clusters (GCs), including 12 Milky Way GCs and the Magellanic Cloud GCs NGC 1978 and NGC 416. Based on appropriate two-color diagrams, we find that the fraction of first-generation (1G) stars in Galactic GCs correlates with cluster mass, confirming previous results based on red-giant branch (RGB) stars. Magellanic Cloud GCs show higher fractions of 1G stars than Galactic GCs with similar masses, thus suggesting that the environment affects the MP phenomenon. We compared and combined our population fractions based on the HB with previous estimates from the MS and RGB, and we used ground-based UBVI photometry (available for NGC 104, NGC 5927, NGC 6366, and NGC 6838) to extend the investigation over a wide field of view. All studied GCs are consistent with flat distributions of 1G and second-generation (2G) stars within ∼1' from the cluster center except NGC 416, where the 2G is more centrally concentrated. 2G stars of NGC 104 and NGC 5927 are more centrally concentrated than the 1G stars, whereas the distribution is flat for NGC 6366 and NGC 6838. We discover that most of the analyzed GCs exhibit extended sequences of 1G stars along the red HB, not consistent with a simple population. The comparison between appropriate synthetic and observed CMDs reveals that these extended distributions are consistent with either star-to-star variation in helium or with an internal metallicity spread, recalling the inhomogeneity of 1G stars along the chromosome maps.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Globular star clusters - Population II stars - Chemical abundances - HST photometry - Magellanic Clouds

Simbad objects: 74

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Number of rows : 74
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Cl Lindsay 1 Cl* 00 03 54 -73 28.3   11.7       ~ 111 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3766 0
3 NGC 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 298 0
4 ESO 51-3 Cl* 00 48 50 -69 52.2   16.2       ~ 47 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10456 1
6 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 999 0
7 NGC 339 OpC 00 57 48.90 -74 28 00.2 13.23 12.94 12.21   11.20 ~ 135 0
8 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1023 0
9 NGC 416 Cl* 01 07 59.0 -72 21 20 12.73 12.55 11.76   10.71 ~ 140 1
10 NGC 419 OpC 01 08 17.79 -72 53 02.8 11.41 11.16 10.50   9.34 ~ 256 0
11 Cl Lindsay 113 Cl* 01 49 30.0 -73 43 40   11.9       ~ 85 0
12 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6491 1
13 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 480 0
14 NGC 1783 GlC 04 59 08.590 -65 59 15.84   10.9 10.93     ~ 241 0
15 NGC 1806 GlC 05 02 11.180 -67 59 05.89   11.1       ~ 153 0
16 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 203 0
17 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1349 0
18 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16394 1
19 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 298 0
20 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 468 0
21 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 889 0
22 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1356 0
23 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 811 0
24 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 946 0
25 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 394 0
26 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 788 0
27 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 587 0
28 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3284 0
29 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2394 0
30 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 410 0
31 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 793 0
32 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 330 0
33 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 367 0
34 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1895 0
35 NGC 5927 GlC 15 28 00.69 -50 40 22.9           ~ 437 0
36 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 347 0
37 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 679 0
38 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1778 0
39 NGC 6101 GlC 16 25 48.12 -72 12 07.9           ~ 270 0
40 NGC 6144 GlC 16 27 13.86 -26 01 24.6           ~ 228 0
41 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 756 0
42 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2123 0
43 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 633 0
44 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 754 0
45 NGC 6304 GlC 17 14 32.25 -29 27 43.3           ~ 334 0
46 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2016 0
47 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 376 0
48 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 288 0
49 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 545 0
50 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 872 1
51 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1904 0
52 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 841 0
53 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 209 0
54 NGC 6535 GlC 18 03 50.51 -00 17 51.5     9.85     ~ 273 0
55 NGC 6541 GlC 18 08 02.36 -43 42 53.6           ~ 353 0
56 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 270 0
57 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 839 1
58 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 442 0
59 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 400 0
60 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1313 0
61 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 360 0
62 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1014 0
63 NGC 6717 GlC 18 55 06.04 -22 42 05.3           ~ 225 0
64 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 474 0
65 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 1920 0
66 M 56 GlC 19 16 35.57 +30 11 00.5           ~ 399 0
67 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 817 0
68 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1082 0
69 NGC 6934 GlC 20 34 11.37 +07 24 16.1           ~ 395 0
70 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 399 0
71 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3051 0
72 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 977 1
73 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 992 0
74 NAME Galactic Bulge reg ~ ~           ~ 3967 0

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2022.11.30-11:50:42

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