2019MNRAS.484.4718H

Query : 2019MNRAS.484.4718H

2019MNRAS.484.4718H - Mon. Not. R. Astron. Soc., 484, 4718-4725 (2019/April-3)

Spectroscopic detection of multiple populations in the ∼2 Gyr old cluster Hodge 6 in the LMC.

HOLLYHEAD K., MARTOCCHIA S., LARDO C., BASTIAN N., KACHAROV N., NIEDERHOFER F., CABRERA-ZIRI I., DALESSANDRO E., MUCCIARELLI A., SALARIS M. and USHER C.

Abstract (from CDS):

We report the spectroscopic discovery of abundance spreads (i.e. multiple populations) in the ∼2 Gyr old cluster in the LMC, Hodge 6. We use low-resolution VLT FORS2 spectra of 15 member stars in the cluster to measure their CN and CH band strengths at ≃3883 and 4300 Å, respectively, as well as [C/Fe] and [N/Fe] abundances. We find a subpopulation of two stars that are enriched in nitrogen, and we conclude that this subpopulation is evidence of multiple populations in Hodge 6. This is the second ∼2 Gyr old cluster (the first being NGC 1978 in the LMC) to show multiple populations and the first spectroscopic detection of MPs in a cluster of this age. This result is interesting as it hints at a possible relationship between the disappearance of extended main sequence turn-offs in clusters younger than ∼2 Gyr and the onset of multiple populations at ∼2 Gyr, which should be explored further.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Magellanic Clouds - galaxies: star clusters: individual: Hodge 6

Nomenclature: Table 1: [HML2019] NNNNN N=37 among (Nos 3581-20569).

Simbad objects: 52

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Number of rows : 52
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 Cl Lindsay 1 Cl* 00 03 53.50 -73 28 15.0   11.7       ~ 125 0
2 NGC 100 LSB 00 24 02.837 +16 29 11.00   14.6       ~ 139 0
3 ESO 28-19 Cl* 00 24 45.98 -72 47 37.9   11.6 12.05     ~ 152 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
5 NGC 339 OpC 00 57 47.62 -74 28 14.6 13.23 12.94 12.21   11.20 ~ 157 0
6 NGC 416 Cl* 01 07 59.03 -72 21 20.5 12.73 12.55 11.76   10.71 ~ 156 1
7 NGC 419 OpC 01 08 17.26 -72 53 01.8 11.41 11.16 10.50   9.34 ~ 287 0
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
9 NGC 1806 GlC 05 02 11.180 -67 59 05.89   11.1       ~ 165 0
10 NGC 1850 Cl* 05 08 50.190 -68 45 35.65   8.84 8.96     ~ 298 1
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
12 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 317 0
13 [HML2019] 20569 * 05 41 50.6790 -71 34 39.270     20.18   18.70 ~ 1 0
14 [HML2019] 19789 * 05 41 53.3413 -71 33 04.280     20.39   18.91 ~ 1 0
15 [HML2019] 17152 * 05 42 02.2901 -71 33 59.338     20.39   18.91 ~ 1 0
16 [HML2019] 10758 * 05 42 03.1164 -71 38 39.712     20.76   19.38 ~ 1 0
17 [HML2019] 10665 * 05 42 03.5456 -71 37 33.738     21.50   20.09 ~ 1 0
18 [HML2019] 10150 * 05 42 06.3594 -71 36 48.666     20.93   19.45 ~ 1 0
19 [HML2019] 15219 * 05 42 08.7006 -71 32 06.482     21.09   19.75 ~ 1 0
20 [HML2019] 9607 * 05 42 09.2238 -71 38 30.389     21.64   20.37 ~ 1 0
21 [HML2019] 14926 * 05 42 09.6955 -71 33 51.351     20.20   18.68 ~ 1 0
22 [HML2019] 9409 * 05 42 10.2366 -71 37 14.058     20.54   18.97 ~ 1 0
23 [HML2019] 9237 * 05 42 11.1083 -71 38 22.347     20.39   18.83 ~ 1 0
24 [HML2019] 8419 * 05 42 13.9429 -71 38 46.281     24.07   22.83 ~ 1 0
25 [HML2019] 13362 * 05 42 14.7877 -71 34 51.159     20.97   19.65 ~ 1 0
26 [HML2019] 8384 * 05 42 15.6109 -71 36 57.469     20.50   18.89 ~ 1 0
27 [HML2019] 12852 * 05 42 16.4779 -71 32 43.687     21.26   19.91 ~ 1 0
28 [HML2019] 12838 * 05 42 16.5172 -71 32 52.366     20.66   19.31 ~ 1 0
29 ESO 57-30 GlC 05 42 17.300 -71 35 27.47   12.88 12.09     ~ 25 0
30 [HML2019] 7847 * 05 42 18.3292 -71 36 28.435     20.82   19.29 ~ 1 0
31 [HML2019] 7553 * 05 42 19.9062 -71 37 44.747     20.87   19.50 ~ 1 0
32 [HML2019] 11665 * 05 42 20.1627 -71 33 19.245     20.34   18.87 ~ 1 0
33 [HML2019] 7246 * 05 42 21.4306 -71 37 53.409     20.18   18.56 ~ 1 0
34 [HML2019] 10063 * 05 42 25.3506 -71 32 26.539     19.36   17.73 ~ 1 0
35 [HML2019] 9794 * 05 42 26.2973 -71 32 34.491     20.69   19.35 ~ 1 0
36 [HML2019] 6192 * 05 42 27.0102 -71 36 16.547     20.34   18.81 ~ 1 0
37 [HML2019] 9522 * 05 42 27.2198 -71 33 27.338     20.43   18.93 ~ 1 0
38 [HML2019] 9461 * 05 42 27.4220 -71 35 42.463     21.03   19.68 ~ 1 0
39 [HML2019] 9065 * 05 42 28.7472 -71 34 32.615     21.05   19.63 ~ 1 0
40 [HML2019] 8490 * 05 42 30.5784 -71 34 15.622     20.14   18.64 ~ 1 0
41 [HML2019] 8311 * 05 42 31.2143 -71 33 12.116     20.14   18.66 ~ 1 0
42 [HML2019] 8131 * 05 42 31.8782 -71 35 06.785     20.78   19.34 ~ 1 0
43 [HML2019] 8027 * 05 42 32.2530 -71 35 20.705     20.30   18.73 ~ 1 0
44 [HML2019] 7152 * 05 42 35.2839 -71 35 35.130     20.73   19.27 ~ 1 0
45 [HML2019] 4671 * 05 42 35.3076 -71 37 05.205     19.61   18.01 ~ 1 0
46 [HML2019] 6987 * 05 42 35.9012 -71 34 03.264     21.26   20.35 ~ 1 0
47 [HML2019] 4558 * 05 42 35.9488 -71 38 01.736     20.47   18.96 ~ 1 0
48 [HML2019] 4211 * 05 42 37.8087 -71 36 36.781     20.64   19.13 ~ 1 0
49 [HML2019] 3662 * 05 42 40.9082 -71 37 25.099     20.44   18.90 ~ 1 0
50 [HML2019] 3581 * 05 42 41.3874 -71 38 11.441     20.80   19.46 ~ 1 0
51 Cl Berkeley 39 OpC 07 46 48.1 -04 39 59           ~ 209 1
52 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0

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