2001PASP..113..335M

Query : 2001PASP..113..335M

2001PASP..113..335M - Publ. Astron. Soc. Pac., 113, 335-343 (2001/March-0)

The ages of globular clusters.

McNAMARA D.H.

Abstract (from CDS):

We examine the luminosity levels of the main-sequence turnoffs, MTOv, and horizontal branches, Mv(HB), in 16 globular clusters. An entirely new approach of inferring the luminosity levels by utilizing high-amplitude δ Scuti variables (HADS) is introduced. When the MTOv values are compared with theoretical values inferred from models, we find all 16 clusters (metal-strong to metal-poor) are coeval with an average age of ∼11.3 Gyr. A considerable scatter of Mv(HB) values of clusters at similar [Fe/H] values is found. A trend for clusters with blue horizontal branches to have brighter Mv(HB) than clusters with blue-red horizontal branches is suggested by the data. The Mv(HB) values appear to depend on another or other parameters in addition to the [Fe/H] values. In spite of this problem, we derive an equation relating Mv(HB) values of globular clusters to their [Fe/H] values. We also derive an equation relating the MTOv values of clusters to their [Fe/H] values. Both of these equations can be utilized to find cluster distances. The distance modulus of the LMC is found to be 18.66 from the VTO values of three LMC globular clusters; RR Lyrae stars in seven globular clusters yield 18.61, and RR Lyrae stars in the LMC bar yield 18.64.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Globular Clusters: General - Stars: Variables: δ Scuti

CDS comments: Stars in NGC 6809 not identified (not in ref. 7)

Simbad objects: 82

goto Full paper

goto View the references in ADS

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 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 Cl* NGC 104 DPF 1997 V* 00 24 05.653 -72 04 53.10     15.73     ~ 5 0
3 Cl* NGC 104 FDP 183 SX* 00 24 06.27999999998 -72 04 36.9999999955 15.98 15.91 15.59     ~ 10 0
4 Cl* NGC 104 DPF 1758 SX* 00 24 06.606 -72 04 49.47 16.13 16.25 15.93   15.55 ~ 12 0
5 Cl* NGC 104 SAW V32 XB* 00 24 07.812 -72 04 58.40 18.002   17.523   16.855 ~ 6 0
6 Cl* NGC 104 EGG V2 SX* 00 24 09.145 -72 05 04.30 15.78 15.46 15.07   14.64 ~ 10 0
7 Cl* NGC 104 EGG V5 CV* 00 24 10.102 -72 04 51.07     15.50     ~ 7 0
8 Cl* NGC 288 SAW V7 SX* 00 52 41.46 -26 33 59.3   18.20 17.92     ~ 8 0
9 Cl* NGC 288 SAW V6 SX* 00 52 42.47 -26 34 54.2   17.58 17.28     ~ 8 0
10 Cl* NGC 288 SAW V4 SX* 00 52 42.83 -26 34 46.0   17.53 17.24     ~ 9 0
11 Cl* NGC 288 SAW V9 SX* 00 52 42.910 -26 34 10.00   17.81 17.52     ~ 7 0
12 Cl* NGC 288 SAW V8 SX* 00 52 44.3174025217 -26 34 00.305640514   18.06 17.78     ~ 8 0
13 Cl* NGC 288 SAW V5 SX* 00 52 45.0311762751 -26 33 52.790446459   17.70 17.54     ~ 11 0
14 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
15 NGC 1466 GlC 03 44 32.71 -71 40 18.0   11.6 11.59     ~ 166 0
16 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 177 1
17 NGC 1841 GlC 04 45 24.38 -83 59 53.3   12.23 11.43     ~ 190 0
18 NGC 1786 Cl* 04 59 07.470 -67 44 45.44   10.1       ~ 152 0
19 NGC 1835 Cl* 05 05 09.210 -69 24 20.96   11.314 10.596     ~ 173 0
20 NGC 2210 GlC 06 11 31.296 -69 07 17.04   10.9 10.94     ~ 196 0
21 NAME Hodge 11 GlC 06 14 22.92 -69 50 54.9   12.57 11.93     ~ 117 0
22 NGC 2257 Cl* 06 30 12.62 -64 19 40.0   13.24 12.62     ~ 228 0
23 Cl* NGC 4372 KK V15 SX* 12 25 08.07 -72 38 47.9   18.56 17.81     ~ 6 0
24 Cl* NGC 4372 KK V18 SX* 12 25 13.05 -72 39 36.8   17.78 17.12     ~ 6 0
25 Cl* NGC 4372 KK V2 SX* 12 25 19.29 -72 35 02.3   18.65 17.92     ~ 6 0
26 Cl* NGC 4372 KK V25 SX* 12 25 34.24 -72 40 26.3   17.96 17.24     ~ 6 0
27 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 327 0
28 Cl* NGC 4372 KK V29 SX* 12 25 46.21 -72 41 49.5   18.18 17.26     ~ 6 0
29 Cl* NGC 4372 KK V14 SX* 12 25 57.83 -72 38 43.4   18.77 17.86     ~ 6 0
30 Cl* NGC 4372 KK V8 SX* 12 26 16.08 -72 38 05.6   17.70 17.03     ~ 5 0
31 Cl* NGC 4372 KK V6 SX* 12 26 18.59 -72 37 40.3   17.80 16.93     ~ 6 0
32 Cl* Ruprecht 106 SAW V4 SX* 12 38 30.6 -51 08 11   20.07 19.71     ~ 6 0
33 Cl Ruprecht 106 GlC 12 38 40.20 -51 09 01.0           ~ 413 0
34 Cl* Ruprecht 106 SAW V3 SX* 12 38 46.4 -51 07 52   20.41 20.05     ~ 6 0
35 Cl* Ruprecht 106 SAW V11 SX* 12 38 48.5 -51 09 32   20.60 20.25     ~ 6 0
36 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
37 Cl* NGC 4590 WALK V48 SX* 12 39 28 -26 44.6   17.54 17.27   16.91 ~ 7 0
38 Cl* NGC 4590 WALK V39 SX* 12 39 28 -26 44.6   18.30 18.05   17.63 ~ 7 0
39 Cl* NGC 5053 SMBS 15 SX* 13 16 17.26 +17 40 29.4   19.92 19.60   19.34 ~ 10 0
40 Cl* NGC 5053 SMBS 14 SX* 13 16 17.83 +17 40 52.1   19.76 19.46   19.23 ~ 10 0
41 Cl* NGC 5053 SMBS 13 SX* 13 16 23.87 +17 42 00.9   19.91 19.58   19.26 ~ 12 0
42 Cl* NGC 5053 SMBS 11 SX* 13 16 25.30 +17 43 48.7   19.83 19.57   19.28 ~ 12 0
43 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
44 Cl* NGC 5053 SMBS 7 SX* 13 16 32.23 +17 42 09.5   19.62 19.39   19.12 ~ 12 0
45 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
46 NAME SE174 in M 3 SX* 13 42 11 +28 22.5   18.24 17.98     ~ 4 0
47 NAME Anon in M 3 SX* 13 42 11.0 +28 22 30   18.56 18.36     ~ 5 0
48 NAME NW449 in M 3 SX* 13 42 11 +28 22.5   18.29 18.29     ~ 4 0
49 NAME NW858 in M 3 SX* 13 42 11 +28 22.5   18.44 18.28     ~ 4 0
50 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
51 Cl* NGC 5272 BCB 8484 RR* 13 42 15.73 +28 18 17.3   18.29 18.02   17.74 ~ 9 0
52 Cl* NGC 5466 NH 28 BS* 14 05 20.58 +28 31 36.5   19.029 18.821   18.393 ~ 3 0
53 Cl* NGC 5466 SAW V34 SX* 14 05 20.7029631109 +28 31 53.254125257   18.781 18.544   18.286 ~ 15 0
54 Cl* NGC 5466 SAW V31 SX* 14 05 23.68 +28 31 38.0   18.937 18.823   18.575 ~ 15 0
55 Cl* NGC 5466 SAW V32 SX* 14 05 25.93 +28 31 02.9   19.418 19.067   18.723 ~ 14 0
56 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
57 ZTF J140528.02+283108.2 dS* 14 05 28.02 +28 31 08.3   19.007 18.871   18.570 ~ 17 0
58 Cl* NGC 5466 SAW V35 SX* 14 05 35.07 +28 30 45.6   19.009 19.048   18.702 ~ 15 0
59 Cl* IC 4499 SBS 4 SX* 15 00 17.0680811688 -82 11 33.821426940   19.71 19.30     ~ 3 0
60 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 375 0
61 NGC 5904 227 RR* 15 18 10.2318868776 +02 04 29.735374692   14.91 15.03     ~ 28 0
62 Cl* NGC 5904 SAW V160 SX* 15 18 29.85 +02 04 09.5     15.30     ~ 7 0
63 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
64 NGC 5904 655 RR* 15 18 35.4570262032 +02 07 29.454988152   14.81 15.107   14.614 ~ 20 0
65 NGC 5904 857 RR* 15 18 44.2142070816 +02 06 37.791821088   15.36 15.063   14.522 ~ 24 0
66 NGC 5904 886 RR* 15 18 46.4975635104 +02 06 10.966828788   15.15 15.06     ~ 25 0
67 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
68 Cl* NGC 6362 SAW V38 SX* 17 31 43.6117900008 -67 02 58.504367184   17.3 16.98   16.55 ~ 6 0
69 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
70 Cl* NGC 6362 SAW V48 SX* 17 31 59.8221815352 -67 03 49.948024464   17.37 17.01     ~ 6 0
71 Cl* NGC 6362 SAW V47 SX* 17 32 13.0260848184 -67 02 37.940197200   17.43 17.10     ~ 6 0
72 Cl* NGC 6362 SAW V46 SX* 17 32 24.9536650728 -67 00 31.412087604   17.85 17.48     ~ 6 0
73 Cl* NGC 6397 LOAM 11 SX* 17 40 37.525 -53 40 36.13   16.33 15.97   15.46 ~ 11 0
74 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
75 Cl* NGC 6397 LOAM 9 SX* 17 40 44.107 -53 40 40.43   15.75 15.40   14.88 ~ 14 0
76 Cl* NGC 6752 SAW V13 SX* 19 10 14.2944580608 -60 05 04.038130212   16.54 16.26   16.04 ~ 7 0
77 Cl* NGC 6752 SAW V12 SX* 19 10 34.1958 -59 56 56.952   16.56 16.27   15.83 ~ 8 0
78 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
79 Cl* NGC 6752 SAW V7 SX* 19 10 54.0686407791 -60 00 12.443857379   15.88 15.59   15.26 ~ 8 0
80 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
81 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
82 Cl* NGC 6838 H 1 SX* 19 53 48.16 +18 47 50.4   16.80 16.33     ~ 15 0

To bookmark this query, right click on this link: simbad:objects in 2001PASP..113..335M and select 'bookmark this link' or equivalent in the popup menu