2009A&A...497..755M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST15:22:21

2009A&A...497..755M - Astronomy and Astrophysics, volume 497, 755-771 (2009/4-3)

Multiple stellar populations in Magellanic cloud clusters. I. An ordinary feature for intermediate age globulars in the LMC?

MILONE A.P., BEDIN L.R., PIOTTO G. and ANDERSON J.

Abstract (from CDS):

The discovery of multiple main sequences (MS) in the massive clusters NGC 2808 and Omega Centauri, along with multiple subgiant branches in NGC 1851 and NGC 6388 has challenged the long-held paradigm that globular clusters consist of simple stellar populations. This evolving picture has been further complicated by recent photometric studies of the Large Magellanic Cloud (LMC) intermediate-age clusters, where the main sequence turn-off (MSTO) was found to be bimodal (NGC 1806 and NGC 1846) or broadened (NGC 1783 and NGC 2173). We undertook a study of archival HST images of Large and Small Magellanic Cloud clusters with the aim of measuring the frequency of clusters with evidence of multiple or prolonged star formation events and determining their main properties. We found useful images for 53 clusters that cover a wide range of ages. In this paper, we analyse the color-magnitude diagrams (CMD) of sixteen intermediate-age (∼1-3Gyr) LMC clusters. The data were reduced and the photometry corrected for differential reddening (where required). We find that eleven clusters show an anomalous spread (or split) in colour and magnitude around the MSTO, even though the other main features of the CMD (MS, red giant branch, asymptotic giant branch) are narrow and the horizontal branch (HB) red clump well defined. By using the CMD of the stars in regions that surround the cluster, we demonstrate that the observed feature is unequivocally associated to the clusters. We use artificial-star tests to demonstrate that the spread (or split) is not an artifact due to photometric errors or binaries. We confirm that two clusters (NGC 1806 and NGC 1846) clearly exhibit two distinct MSTOs and observe, for the first time, a double MSTO in NGC 1751. In these three clusters, the population corresponding to the brighter MSTO includes more than two-thirds of the cluster stellar population. We confirm the presence of multiple stellar populations in NGC 1783. Our photometry strongly suggests that the MSTO of this cluster is formed by two distinct branches. In seven clusters (ESO057-SC075, HODGE7, NGC 1852, NGC 1917, NGC 1987, NGC 2108, and NGC 2154), we observed an intrinsic broadening of the MSTO that may suggest that these clusters have experienced a prolonged period of star formation that spans a period between 150 and 250Myr. The CMDs of IC 2146, NGC 1644, NGC 1652, NGC 1795, and NGC 1978 show no evidence of spread or bimodality within our photometric precision. In summary, 70±25% of our sample are not consistent with the simple, single stellar population hypothesis.

Abstract Copyright:

Journal keyword(s): galaxies: star clusters - stars: Hertzprung-Russell (HR) and C-M diagram - Galaxy: globular clusters: general - galaxies: Magellanic Clouds

Simbad objects: 61

goto Full paper

goto View the reference in ADS

Number of rows : 61

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Cl Lindsay 1 Cl* 00 03 54 -73 28.3   11.7       ~ 95 0
2 ESO 28-15 OpC 00 21 27 -73 44.9   13.9       ~ 23 0
3 Cl Lindsay 27 Cl* 00 41 23.83 -72 53 32.0 13.37 13.28 12.44   11.49 ~ 36 0
4 [MA93] 163 Em* 00 47 11.4 -73 28 37 12.50 12.52 12.17   11.47 ~ 51 0
5 ESO 51-3 Cl* 00 48 50 -69 52.2   16.2       ~ 43 0
6 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9448 1
7 NGC 294 Cl* 00 53 05.59 -73 22 49.4 12.66 12.67 12.24   11.61 ~ 38 1
8 NGC 286 GiG 00 53 30.328 -13 06 46.15   14   13.72   ~ 23 0
9 OGLE-CL SMC 104 OpC 00 55 33.18 -72 50 00.1 13.34 13.25 12.89   12.20 ~ 30 0
10 NGC 419 OpC 01 08 17.79 -72 53 02.8 11.41 11.16 10.50   9.34 ~ 232 0
11 NGC 422 OpC 01 09 24.50 -71 45 59.0 13.56 13.45 13.26   12.83 ~ 28 0
12 IC 1660 OpC 01 12 37.37 -71 45 41.8 13.73 13.68 13.51   13.07 ~ 19 0
13 [RZ2005] 194 Cl* 01 12 51.74 -73 07 10.9 14.66 14.52 13.80   12.83 ~ 19 0
14 NGC 602 Cl* 01 29 32.133 -73 33 38.13     13.018     ~ 79 1
15 Cl Lindsay 113 Cl* 01 49 30.0 -73 43 40   11.9       ~ 76 0
16 ESO 30-5 Cl* 01 50 19 -74 21.4   12.1       ~ 27 0
17 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5669 1
18 NAME Ret GlC 04 36 11.4 -58 51 47   14.00 14.25 13.50   ~ 144 1
19 NGC 1644 GlC 04 37 39 -66 12.0   13.52 12.89     ~ 36 0
20 NGC 1652 GlC 04 38 23.010 -68 40 20.51   13.95 13.13     ~ 38 0
21 H88 7 Cl* 04 52 12 -69 00.4           ~ 8 0
22 NGC 1751 Cl* 04 54 12 -69 48.4   15.06 11.73     ~ 85 0
23 NGC 1756 GlC 04 54 49.130 -69 14 10.20   12.64 12.24     ~ 27 0
24 NGC 1755 Cl* 04 55 16.390 -68 12 23.12   10.00 9.85     ~ 67 0
25 NGC 1783 GlC 04 59 08.590 -65 59 15.84   10.9 10.93     ~ 226 0
26 NGC 1795 Cl* 04 59 46.940 -69 48 08.06   13.15 12.42     ~ 45 0
27 NGC 1801 Cl* 05 00 35.610 -69 36 42.16   12.43 12.16     ~ 23 0
28 NGC 1806 GlC 05 02 11.180 -67 59 05.89   11.1       ~ 143 0
29 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 180 0
30 NGC 1855 Cl* 05 09 21.180 -68 50 39.56   10.18 10.39     ~ 75 0
31 NGC 1852 Cl* 05 09 23.760 -67 46 38.00   12.74 12.01     ~ 49 0
32 NGC 1858 Cl* 05 09 56.09 -68 54 06.2   9.76 9.88     ~ 76 3
33 NGC 1872 Cl* 05 13 10.040 -69 18 44.95   11.39 11.04     ~ 35 0
34 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1242 0
35 NGC 1903 Cl* 05 17 22.700 -69 20 08.17   12.00 11.86     ~ 62 1
36 NGC 1917 Cl* 05 19 03.370 -69 00 06.34   12.90 12.33     ~ 44 0
37 NGC 1928 Cl* 05 20 55.940 -69 28 34.96   13.34 12.47     ~ 63 0
38 NGC 1939 Cl* 05 21 26.82 -69 56 59.0   12.52 11.83     ~ 55 0
39 NGC 1943 Cl* 05 22 30.310 -70 09 18.76   12.15 11.88     ~ 33 0
40 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14838 1
41 NGC 1953 Cl* 05 25 29.060 -68 50 16.54   11.97 11.74     ~ 36 0
42 NGC 1967 Cl* 05 26 43.320 -69 05 51.98   10.80 10.81     ~ 24 0
43 NGC 1987 GlC 05 27 16.940 -70 44 14.16   12.1       ~ 87 0
44 NGC 1983 Cl* 05 27 44 -68 59.1           ~ 51 0
45 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 273 0
46 NGC 2002 Cl* 05 30 21.000 -66 53 06.20   11.28 10.84     ~ 58 0
47 NGC 2010 Cl* 05 30 34.230 -70 49 08.23   11.96 11.72     ~ 38 0
48 NGC 1975 BNe 05 35 18.1 -04 41 05           ~ 14 0
49 NGC 2056 Cl* 05 36 33.540 -70 40 06.64   11.80 11.77     ~ 27 0
50 IC 2146 Cl* 05 37 46 -74 47.0   13.10 12.41     ~ 34 0
51 NGC 2107 Cl* 05 43 12.270 -70 38 26.83   11.89 11.51     ~ 48 0
52 NGC 2108 GlC 05 43 56.270 -69 10 54.37   12.90 12.32     ~ 64 0
53 NGC 2154 Cl* 05 57 38 -67 15.7   12.47 11.79     ~ 57 0
54 NGC 2173 GlC 05 57 58 -72 58.7   12.74 11.88     ~ 130 0
55 ESO 121-3 Cl* 06 02 02.0 -60 31 20   14.91 14.04     ~ 104 0
56 ESO 57-75 Cl* 06 13 27.3 -70 41 42   14.41 13.67     ~ 38 0
57 IRAS 09110-6439 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1246 0
58 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2999 0
59 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1677 0
60 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 806 1
61 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1808 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2009A&A...497..755M and select 'bookmark this link' or equivalent in the popup menu


2020.07.16-15:22:21

© Université de Strasbourg/CNRS

    • Contact