2017MNRAS.465.4159N

Query : 2017MNRAS.465.4159N

2017MNRAS.465.4159N - Mon. Not. R. Astron. Soc., 465, 4159-4165 (2017/March-2)

The search for multiple populations in Magellanic Cloud clusters - II. The detection of multiple populations in three intermediate-age SMC clusters.

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

Abstract (from CDS):

This is the second paper in our series about the search for multiple populations in Magellanic Cloud star clusters using the Hubble Space Telescope. Here we report the detection of multiple stellar populations in the colour-magnitude diagrams of the intermediate-age clusters Lindsay 1, NGC 416 and NGC 339. With ages between 6.0 and 7.5 Gyr, these clusters are the youngest ones in which chemical abundance spreads have been detected so far. This confirms that the appearance of multiple populations is not restricted to only ancient globular clusters, but may also be a common feature in clusters as young as 6 Gyr. Our results are in agreement with a recent spectroscopic study of Lindsay 1. We found that the fraction of enriched stars in NGC 416 is ∼45 per cent whereas it is ∼25 per cent in NGC 339 and ∼36 per cent in Lindsay 1. Similar to NGC 121, these fractions are lower than the average value for globular clusters in the Milky Way.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - Hertzsprung-Russell and colour-magnitude diagrams - galaxies: individual: SMC - galaxies: star clusters: individual: Lindsay 1 - galaxies: star clusters: individual: NGC 339 - galaxies: star clusters: individual: NGC 416 - galaxies: star clusters: individual: NGC 416

Simbad objects: 12

Full paper

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Number of rows : 12

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	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 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 339	OpC	00 57 47.62	-74 28 14.6	13.23	12.94	12.21	11.20	~	157	0
5	NGC 416	Cl*	01 07 59.03	-72 21 20.5	12.73	12.55	11.76	10.71	~	156	1
6	MCG-06-07-001	G	02 39 59.3	-34 26 57		9.02	7.4		~	1894	1
7	NAME Magellanic Clouds	GrG	03 00	-71.0					~	7988	0
8	NAME LMC	G	05 23 34.6	-69 45 22			0.4		~	19090	0
9	Cl Ruprecht 106	GlC	12 38 40.20	-51 09 01.0					~	413	0
10	IC 4499	GlC	15 00 18.57	-82 12 49.6			8.56		~	375	0
11	NAME SDG	G	18 55 19.0	-30 32 43		4.5	3.6		~	2438	2
12	NGC 6791	OpC	19 20 52.8	+37 46 40		10.52	9.5		~	1120	0

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