1999ApJ...527..199J

Query : 1999ApJ...527..199J

1999ApJ...527..199J - Astrophys. J., 527, 199-218 (1999/December-2)

Hubble space telescope observations of the oldest star clusters in the Large Magellanic Cloud.

JOHNSON J.A., BOLTE M., STETSON P.B., HESSER J.E. and SOMERVILLE R.S.

Abstract (from CDS):

We present V, V-I color-magnitude diagrams (CMDs) for three old star clusters in the Large Magellanic Cloud (LMC): NGC 1466, NGC 2257, and Hodge 11. Our data extend ∼3 mag below the main-sequence turnoff, allowing us to determine accurate relative ages and the blue straggler frequencies. Based on a differential comparison of the CMDs, any age difference between the three LMC clusters is less than 1.5 Gyr. Comparing their CMDs to those of M92 and M3, the LMC clusters, unless their published metallicities are significantly in error, are the same age as the old Galactic globulars. The similar ages to Galactic globulars are shown to be consistent with hierarchial clustering models of galaxy formation. The blue straggler frequencies are also similar to those of Galactic globular clusters. We derive a true distance modulus to the LMC of (m-M)0=18.46±0.09 [assuming (m-M)0=14.61 for M92] using these three LMC clusters.

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Journal keyword(s): Stars: Blue Stragglers - globular clusters: individual (NGC 1466) - Galaxy: Globular Clusters: Individual: NGC Number: NGC 2257 - globular clusters: individual (Hodge 11) - Galaxies: Magellanic Clouds

VizieR on-line data: <Available at CDS (J/ApJ/527/199): table2a.dat table2b.dat table2c.dat>

Simbad objects: 26

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Number of rows : 26
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 NGC 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 330 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
5 NGC 1466 GlC 03 44 32.71 -71 40 18.0   11.6 11.59     ~ 166 0
6 NAME Eridanus Star Cluster GlC 04 24 44.5 -21 11 13           ~ 192 1
7 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 177 1
8 NGC 1841 GlC 04 45 24.38 -83 59 53.3   12.23 11.43     ~ 190 0
9 NGC 1786 Cl* 04 59 07.470 -67 44 45.44   10.1       ~ 152 0
10 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
12 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
13 NGC 2210 GlC 06 11 31.296 -69 07 17.04   10.9 10.94     ~ 196 0
14 NAME Hodge 11 GlC 06 14 22.92 -69 50 54.9   12.57 11.93     ~ 117 0
15 NGC 2257 Cl* 06 30 12.62 -64 19 40.0   13.24 12.62     ~ 228 0
16 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
17 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 354 1
18 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 379 1
19 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
20 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
21 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
22 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
23 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
24 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
25 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
26 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0

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