2015A&A...575A..62N


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST05:16:55

2015A&A...575A..62N - Astronomy and Astrophysics, volume 575A, 62-62 (2015/3-1)

No evidence for significant age spreads in young massive LMC clusters.

NIEDERHOFER F., HILKER M., BASTIAN N. and SILVA-VILLA E.

Abstract (from CDS):

Recent discoveries have put the picture of stellar clusters being simple stellar populations into question. In particular, the color-magnitude diagrams of intermediate age (1-2Gyr) massive clusters in the Large Magellanic Cloud (LMC) show features that could be interpreted as age spreads of 100-500Myr. If multiple generations of stars are present in these clusters then, as a consequence, young (<1Gyr) clusters with similar properties should have age spreads of the same order. In this paper we use archival Hubble Space Telescope (HST) data of eight young massive LMC clusters (NGC 1831, NGC 1847, NGC 1850, NGC 2004, NGC 2100, NGC 2136, NGC 2157 and NGC 2249) to test this hypothesis. We analyzed the color-magnitude diagrams of these clusters and fitted their star formation history to derive upper limits of potential age spreads. We find that none of the clusters analyzed in this work shows evidence for an extended star formation history that would be consistent with the age spreads proposed for intermediate age LMC clusters. Tests with artificial single age clusters show that the fitted age dispersion of the youngest clusters is consistent with spreads that are purely induced by photometric errors. As an additional result we determined a new age of NGC 1850 of ∼100Myr, significantly higher than the commonly used value of about 30Myr, although consistent with early HST estimates.

Abstract Copyright:

Journal keyword(s): galaxies: star clusters: general - Magellanic Clouds - Hertzsprung-Russell and C-M diagrams - stars: evolution

Simbad objects: 30

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Number of rows : 30

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 NGC 34 Sy2 00 11 06.612 -12 06 28.33   14.14 13.52     ~ 308 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9478 1
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5698 1
4 NGC 1651 GlC 04 37 32.530 -70 35 08.71   12.99 12.28     ~ 107 0
5 NGC 1751 Cl* 04 54 12 -69 48.4   15.06 11.73     ~ 85 0
6 NGC 1783 GlC 04 59 08.590 -65 59 15.84   10.9 10.93     ~ 226 0
7 NGC 1806 GlC 05 02 11.180 -67 59 05.89   11.1       ~ 143 0
8 NGC 1805 GlC 05 02 21.690 -66 06 39.43           ~ 105 0
9 NGC 1818 GlC 05 04 13.300 -66 26 05.47   9.7       ~ 237 0
10 NGC 1831 GlC 05 06 17.4 -64 55 11   11.52 11.18     ~ 153 0
11 NGC 1847 Cl* 05 07 08.200 -68 58 15.49   12.508 12.469     ~ 86 0
12 NGC 1844 Cl* 05 07 29.910 -67 19 26.86   12.29 12.08     ~ 42 0
13 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 181 0
14 NGC 1850A Cl* 05 08 39.39 -68 45 43.4           ~ 18 3
15 NGC 1850 Cl* 05 08 50.190 -68 45 35.65   8.84 8.96     ~ 231 1
16 NGC 1856 Cl* 05 09 30.290 -69 07 45.08   10.40 10.06     ~ 137 0
17 NGC 1866 GlC 05 13 38.920 -65 27 52.75   9.98 9.73     ~ 389 0
18 NAME LMC Bar ? 05 22 08 -69 23.5           ~ 258 0
19 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14874 1
20 NGC 1987 GlC 05 27 16.940 -70 44 14.16   12.1       ~ 87 0
21 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 273 0
22 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 264 0
23 NGC 2100 Cl* 05 42 07.200 -69 12 26.99   9.6       ~ 180 0
24 NGC 2108 GlC 05 43 56.270 -69 10 54.37   12.90 12.32     ~ 64 0
25 NGC 2136 Cl* 05 53 01.800 -69 29 24.24   10.99 10.70     ~ 110 1
26 NGC 2157 Cl* 05 57 35.430 -69 11 48.67   10.35 10.16     ~ 118 0
27 NGC 2173 GlC 05 57 58 -72 58.7   12.74 11.88     ~ 130 0
28 ESO 57-75 Cl* 06 13 27.3 -70 41 42   14.41 13.67     ~ 38 0
29 NGC 2249 GlC 06 25 49 -68 55.2   12.66 12.23     ~ 63 0
30 Cl Trumpler 20 OpC 12 39 45 -60 38.1     10.1     ~ 71 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-05:16:55

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