2017MNRAS.464...94N


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET23:10:04

2017MNRAS.464...94N - Mon. Not. R. Astron. Soc., 464, 94-103 (2017/January-1)

The search for multiple populations in Magellanic Cloud clusters - I. Two stellar populations in the Small Magellanic Cloud globular cluster NGC 121.

NIEDERHOFER F., BASTIAN N., KOZHURINA-PLATAIS V., LARSEN S., SALARIS M., DALESSANDRO E., MUCCIARELLI A., CABRERA-ZIRI I., CORDERO M., GEISLER D., HILKER M., HOLLYHEAD K., KACHAROV N., LARDO C., LI C., MACKEY D. and PLATAIS I.

Abstract (from CDS):

We started a photometric survey using the WFC3/UVIS instrument onboard the Hubble Space Telescope to search for multiple populations within Magellanic Cloud star clusters at various ages. In this paper, we introduce this survey. As first results of this programme, we also present multiband photometric observations of NGC 121 in different filters taken with the WFC3/UVIS and ACS/WFC instruments. We analyse the colour-magnitude diagram (CMD) of NGC 121, which is the only 'classical' globular cluster within the Small Magellanic Cloud. Thereby, we use the pseudo-colour CF336W,F438W,F343N = (F336W - F438W) - (F438W - F343N) to separate populations with different C and N abundances. We show that the red giant branch splits up in two distinct populations when using this colour combination. NGC 121 thus appears to be similar to Galactic globular clusters in hosting multiple populations. The fraction of enriched stars (N rich, C poor) in NGC 121 is about 32 per cent ± 3 per cent, which is lower than the median fraction found in Milky Way globular clusters. The enriched population seems to be more centrally concentrated compared to the primordial one. These results are consistent with the recent results by Dalessandro et al. The morphology of the horizontal branch in a CMD using the optical filters F555W and F814W is best produced by a population with a spread in helium of ΔY = 0.025±0.005.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: abundances - Hertzsprung-Russell and colour-magnitude diagrams - galaxies: individual: SMC - galaxies: star clusters: individual: NGC 121 - galaxies: star clusters: individual: NGC 121

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 - 2021
#notes
1 Cl Lindsay 1 Cl* 00 03 54 -73 28.3   11.7       ~ 95 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3584 0
3 NGC 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 276 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9607 1
5 NGC 339 OpC 00 57 48.90 -74 28 00.2 13.23 12.94 12.21   11.20 ~ 120 0
6 NGC 361 OpC 01 02 12.83 -71 36 16.2 12.86 12.43 11.77   10.70 ~ 91 0
7 NGC 416 Cl* 01 07 59.0 -72 21 20 12.73 12.55 11.76   10.71 ~ 129 1
8 NGC 419 OpC 01 08 17.79 -72 53 02.8 11.41 11.16 10.50   9.34 ~ 233 0
9 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1497 1
10 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5793 1
11 NGC 1651 GlC 04 37 32.530 -70 35 08.71   12.99 12.28     ~ 108 0
12 NGC 1705 SBG 04 54 13.500 -53 21 39.82 12.32 12.96 12.56 12.58 12.9 ~ 599 1
13 NGC 1783 GlC 04 59 08.590 -65 59 15.84   10.9 10.93     ~ 226 0
14 NGC 1806 GlC 05 02 11.180 -67 59 05.89   11.1       ~ 143 0
15 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 183 0
16 NGC 1850 Cl* 05 08 50.190 -68 45 35.65   8.84 8.96     ~ 235 1
17 NGC 1856 Cl* 05 09 30.290 -69 07 45.08   10.40 10.06     ~ 137 0
18 NGC 1866 GlC 05 13 38.920 -65 27 52.75   9.98 9.73     ~ 389 0
19 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15060 1
20 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 273 0
21 NGC 2173 GlC 05 57 58 -72 58.7   12.74 11.88     ~ 130 0
22 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 324 0
23 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 313 0
24 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1688 0
25 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 494 0
26 RSGC 1 OpC 18 37 58 -06 53.0           ~ 91 0
27 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 86 0
28 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1787 2
29 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1818 0
30 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2925 0

    Equat.    Gal    SGal    Ecl

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2020.11.30-23:10:04

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