2017MNRAS.468L..11F

Query : 2017MNRAS.468L..11F

2017MNRAS.468L..11F - Mon. Not. R. Astron. Soc., 468, L11-L15 (2017/June-2)

A discovery of young stellar objects in older clusters of the Large Magellanic Cloud.

FOR B.-Q. and BEKKI K.

Abstract (from CDS):

Recent studies have shown that an extended main-sequence turn-off is a common feature among intermediate-age clusters (1-3 Gyr) in the Magellanic Clouds. Multiple-generation star formation and stellar rotation or interacting binaries have been proposed to explain the feature. However, it remains controversial in the field of stellar populations. Here we present the main results of an ongoing star formation among older star clusters in the Large Magellanic Cloud. Cross-matching the positions of star clusters and young stellar objects has yielded 15 matches, with 7 located in the cluster centre. We demonstrate that this is not by chance by estimating local number densities of young stellar objects for each star cluster. This method is not based on isochrone fitting, which leads to some uncertainties in age estimation and methods of background subtraction. We also find no direct correlation between atomic hydrogen and the clusters. This suggests that gas accretion for fueling the star formation must be happening in situ. These findings support for the multiple-generations scenario as a plausible explanation for the extended main-sequence turn-off.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Magellanic Clouds - galaxies: star clusters: general - galaxies: star clusters: general

Nomenclature: Table 1: [FB2017] JDD.dddddd+DD.dddddd N=15.

Simbad objects: 23

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Number of rows : 23
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 BSDL 192 Cl* 04 54 05 -69 40.9           ~ 9 0
4 KMHK 268 Cl* 04 55 23.890 -66 26 34.34           ~ 7 0
5 KMHK 348 Cl* 04 57 29.910 -67 41 02.04           ~ 16 0
6 NGC 1783 GlC 04 59 08.590 -65 59 15.84   10.9 10.93     ~ 273 0
7 NGC 1845 As* 05 06 19.850 -70 28 50.98   10.31 10.20     ~ 24 1
8 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 231 0
9 KMHK 694 OpC 05 15 37 -66 41.7           ~ 7 0
10 KMHK 709 OpC 05 16 06 -71 48.4           ~ 9 0
11 KMHK 764 Cl* 05 18 51 -70 36.2           ~ 6 0
12 KMHK 779 OpC 05 19 56 -68 21.0           ~ 7 0
13 KMHK 827 Cl* 05 22 29.280 -66 31 41.40           ~ 7 0
14 NAME LMC 5 Supergiant Shell sh 05 22 42 -66 05.6           ~ 56 0
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
16 BSDL 1624 As* 05 25 56 -66 11.1           ~ 4 0
17 BSDL 1668 As* 05 26 07 -67 59.3           ~ 4 0
18 BSDL 1846 As* 05 28 00 -69 00.8           ~ 6 0
19 NAME LMC 4 Supergiant Shell sh 05 31 33 -66 40.5           ~ 183 0
20 BSDL 2348 Cl* 05 34 16 -66 14.0           ~ 5 0
21 NGC 2030 HII 05 35 33.6 -66 02 26           ~ 75 0
22 BMG 33 OpC 05 44 42 -68 30.1           ~ 6 0
23 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0

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