2014ApJ...785...21M


Query : 2014ApJ...785...21M

2014ApJ...785...21M - Astrophys. J., 785, 21 (2014/April-2)

Global and nonglobal parameters of horizontal-branch morphology of globular clusters.

MILONE A.P., MARINO A.F., DOTTER A., NORRIS J.E., JERJEN H., PIOTTO G., CASSISI S., BEDIN L.R., RECIO BLANCO A., SARAJEDINI A., ASPLUND M., MONELLI M. and APARICIO A.

Abstract (from CDS):

The horizontal-branch (HB) morphology of globular clusters (GCs) is mainly determined by metallicity. However, the fact that GCs with almost the same metallicity exhibit different HB morphologies demonstrates that at least one more parameter is needed to explain the HB morphology. It has been suggested that one of these should be a global parameter that varies from GC to GC and the other a nonglobal parameter that varies within the GC. In this study we provide empirical evidence corroborating this idea. We used the photometric catalogs obtained with the Advanced Camera for Surveys of the Hubble Space Telescope and analyze the color-magnitude diagrams of 74 GCs. The HB morphology of our sample of GCs has been investigated on the basis of the two new parameters L1 and L2 that measure the distance between the red giant branch and the coolest part of the HB and the color extension of the HB, respectively. We find that L1 correlates with both metallicity and age, whereas L2 most strongly correlates with the mass of the hosting GC. The range of helium abundance among the stars in a GC, characterized by ΔY and associated with the presence of multiple stellar populations, has been estimated in a few GCs to date. In these GCs we find a close relationship among ΔY, GC mass, and L2. We conclude that age and metallicity are the main global parameters, while the range of helium abundance within a GC is the main nonglobal parameter defining the HB morphology of Galactic GCs.

Abstract Copyright:

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

Simbad objects: 82

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Number of rows : 82
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     ~ 3740 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 988 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1016 0
4 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 473 0
5 Cl Pal 1 GlC 03 33 20.04 +79 34 51.8   17.2       ~ 224 1
6 NAME Eridanus ClG GrG 03 38 32.00 -22 18 51.0           ~ 160 0
7 NAME E 1 GlC 03 55 02.5 -49 36 52           ~ 191 0
8 Cl Pal 2 GlC 04 46 05.91 +31 22 53.4   15       ~ 161 0
9 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1335 0
10 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 766 0
11 NGC 2298 GlC 06 48 59.41 -36 00 19.1   10.77 8.89     ~ 462 0
12 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 881 0
13 NAME PYX GLOBULAR CL GlC 09 07 57.80 -37 13 17.0           ~ 93 0
14 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1340 0
15 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 309 1
16 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 801 0
17 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 334 1
18 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 539 0
19 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 346 0
20 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 939 0
21 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 384 0
22 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 776 0
23 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 580 0
24 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3253 0
25 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2378 0
26 NGC 5286 GlC 13 46 26.81 -51 22 27.3   9.18 8.31     ~ 405 0
27 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 781 0
28 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 329 0
29 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 687 1
30 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1880 0
31 NGC 5927 GlC 15 28 00.69 -50 40 22.9   10.13 8.86     ~ 432 0
32 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 339 0
33 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 346 0
34 Cl Lynga 7 GlC 16 11 03.65 -55 19 04.0           ~ 102 0
35 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 671 0
36 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1766 0
37 Cl* NGC 6121 SAW V40 RR* 16 23 36.453 -26 30 43.37   14.52 13.27     ~ 12 0
38 Cl* NGC 6121 SAW V27 RR* 16 23 43.1526941376 -26 27 16.387433172 14.22 13.90 13.21 12.73 12.18 hF6 25 0
39 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 266 0
40 NGC 6144 GlC 16 27 13.86 -26 01 24.6   10.55 9.63     ~ 224 0
41 M 107 GlC 16 32 31.86 -13 03 13.6   9.96 8.85     ~ 750 0
42 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2108 0
43 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 627 0
44 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 746 0
45 GCl 50 GlC 16 59 51.1 -00 32 00   15.70       ~ 181 1
46 NGC 6304 GlC 17 14 32.25 -29 27 43.3   10.33 9.03     ~ 330 0
47 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2001 0
48 NGC 6352 GlC 17 25 29.11 -48 25 19.8   9.95 8.87     ~ 369 0
49 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 285 0
50 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 537 0
51 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 865 1
52 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1886 1
53 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 204 0
54 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 830 0
55 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 206 0
56 NGC 6535 GlC 18 03 50.51 -00 17 51.5   11.35 9.85     ~ 269 0
57 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 348 1
58 NGC 6584 GlC 18 18 37.60 -52 12 56.8   10.32 8.17     ~ 265 0
59 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 829 1
60 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 438 1
61 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 393 0
62 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1300 0
63 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 355 0
64 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1003 0
65 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 222 0
66 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 469 0
67 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1904 0
68 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 393 0
69 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 401 0
70 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 333 0
71 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 810 0
72 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 295 0
73 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1076 0
74 NGC 6934 GlC 20 34 11.37 +07 24 16.1   10.48 9.75     ~ 390 0
75 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 394 0
76 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 505 0
77 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 3030 0
78 NGC 7079 GiG 21 32 35.2418074440 -44 04 03.412507188   12.63 11.61 11.08   ~ 118 0
79 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 968 1
80 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 983 0
81 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 491 0
82 NAME Local Group GrG ~ ~           ~ 7726 0

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2022.08.18-03:26:36

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