2008ApJ...672..914H

Query : 2008ApJ...672..914H

2008ApJ...672..914H - Astrophys. J., 672, 914-929 (2008/January-2)

NGC 346 in the Small Magellanic Cloud. III. Recent star formation and stellar clustering properties in the bright H II region N66.

HENNEKEMPER E., GOULIERMIS D.A., HENNING T., BRANDNER W. and DOLPHIN A.E.

Abstract (from CDS):

In the third part of our photometric study of the star-forming region NGC 346/N66 and its surrounding field in the Small Magellanic Cloud (SMC), we focus on the large number of low-mass pre-main-sequence (PMS) stars revealed by the Hubble Space Telescope observations with the Advanced Camera for Surveys. We investigate the origin of the observed broadening of the PMS population in the V-I,V color-magnitude diagram. The most likely explanations are either the presence of differential reddening or an age spread among the young stars. Assuming the latter, simulations indicate that we cannot exclude the possibility that stars in NGC 346 might have formed in two distinct events occurring about 10 and 5 Myr ago, respectively. We find that the PMS stars are not homogeneously distributed across NGC 346, but instead are grouped in at least five different clusters. On spatial scales from 0.8" to 8" (0.24-2.4 pc at the distance of the SMC) the clustering of the PMS stars as computed by a two-point angular correlation function is self-similar with a power-law slope γ~-0.3. The clustering properties are quite similar to Milky Way star-forming regions like Orion OB or ρ Oph. Thus molecular cloud fragmentation in the SMC seems to proceed on the same spatial scales as in the Milky Way. This is remarkable given the differences in metallicity and hence dust content between SMC and Milky Way star-forming regions.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual (NGC 346) - Galaxies: Star Clusters - Galaxies: Magellanic Clouds - Stars: Evolution

VizieR on-line data: <Available at CDS (J/ApJ/672/914): table1.dat table2.dat>

Nomenclature: Fig. 10: [HGH2008] Cluster Na (Nos 1, 2a-2b, 3-5).

Simbad objects: 68

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Number of rows : 68
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11152 1
2 [GDB2006] 74 * 00 58 48.900 -72 09 51.84           B0 1 0
3 [BSS2007] 185 Y*? 00 58 51.6 -72 10 16           ~ 2 0
4 S3MC J005852.01-721002.17 Y*? 00 58 52.0 -72 10 02           ~ 2 0
5 [BSS2007] 187 Y*? 00 58 52.6 -72 09 37           ~ 2 0
6 S3MC J005852.84-721041.98 Y*? 00 58 52.8 -72 10 42           ~ 2 0
7 2MASS J00585367-7209436 Y*? 00 58 53.67 -72 09 43.7           ~ 2 0
8 S3MC J005854.59-720951.11 Y*? 00 58 54.6 -72 09 51           ~ 2 0
9 Cl* NGC 346 ELS 7 * 00 58 57.3961905528 -72 10 33.660822720 12.68 13.82 14.13   14.28 O4V((f+)) 52 0
10 Cl* NGC 346 NMC 35 * 00 58 58.786 -72 10 51.52 13.84 14.81 14.95   15.25 O7.5V 8 0
11 [GDB2006] 39 * 00 58 58.840 -72 10 38.57           B0V 1 0
12 Cl* NGC 346 W 4 EB* 00 59 00.0525662904 -72 10 37.962442344 11.82 12.93 13.13   13.77 O5-6V((f)) 37 0
13 S3MC J005900.33-721005.23 Y*? 00 59 00.3 -72 10 05           ~ 2 0
14 Cl* NGC 346 W 3 * 00 59 00.7591806336 -72 10 28.171806492 11.46 12.61 12.80   13.63 O2III(f) 62 0
15 [GDB2006] 54 * 00 59 00.920 -72 11 09.02           O6.5V 1 0
16 Cl* NGC 346 NMC 28 * 00 59 01.8187292184 -72 10 31.216864152   13.95 14.18     O5.5V((f+)) 31 0
17 Cl* NGC 346 MPG 370 * 00 59 01.835 -72 10 43.25 14.34 15.39 15.18     O9.5V 7 0
18 S3MC J005901.96-721034.46 Y*? 00 59 02.0 -72 10 34           ~ 2 0
19 2MASS J00590254-7210071 Y*O 00 59 02.547 -72 10 07.13   17.20 17.998   17.309 ~ 7 0
20 Cl* NGC 346 MPG 395 * 00 59 02.843 -72 10 37.47     15.533   15.781 B0V 5 0
21 S3MC J005902.91-721035.54 Y*? 00 59 02.9 -72 10 35           ~ 2 0
22 Cl* NGC 346 MPG 396 * 00 59 02.92 -72 10 34.8   14.17 14.39     O7V 8 0
23 [BSS2007] 196 Y*? 00 59 03.1 -72 10 39           ~ 2 0
24 [BSS2007] 197 Y*? 00 59 04.1 -72 10 47           ~ 2 0
25 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 490 0
26 Cl* NGC 346 SSN 7 s*b 00 59 04.4955841440 -72 10 24.744449712   12.37 12.57     O4If+O5-6 38 0
27 OGLE SMC108.2 37529 EB* 00 59 04.8003326040 -72 11 02.943228552   15.15 15.308   15.391 O8V 11 0
28 Cl* NGC 346 MPG 451 * 00 59 05.194 -72 10 38.51     15.131   15.365 B0V 5 0
29 [GDB2006] 27 * 00 59 05.860 -72 10 50.09           O6V 1 0
30 Cl* NGC 346 MPG 471 * 00 59 06.0145277640 -72 10 44.965626096 13.65 14.72 14.80   15.11 B0V 6 0
31 LIN 345 Em* 00 59 06.3528755760 -72 09 56.118152448 13.08 14.27 14.34   14.39 B0.5V: 11 0
32 Cl* NGC 346 NMC 17 * 00 59 06.7498587648 -72 10 41.262204828 13.05 14.19 14.33   14.60 O8V 21 0
33 [BS95] 90 Cl* 00 59 07.25 -72 08 59.1 12.94 13.01 12.25   11.88 ~ 29 0
34 Cl* NGC 346 NMC 24 * 00 59 07.3349477712 -72 10 25.381753752   14.83 15.13 15.31   O8V 8 0
35 [GDB2006] 44 * 00 59 07.590 -72 10 48.07           O6V 1 0
36 [GDB2006] 57 * 00 59 08.650 -72 10 13.87           O7V 1 0
37 [GDB2006] 32 * 00 59 09.800 -72 10 58.76           O6V 1 0
38 [HGH2008] Cluster 3 As* 00 59 11.3 -72 10 00           ~ 9 0
39 S3MC J005911.34-721001.34 Y*? 00 59 11.4 -72 10 01           ~ 2 0
40 [MA93] 1125 HXB 00 59 11.646 -72 09 57.52   14.82 15.123 15.34 15.293 O5.5V 23 0
41 Cl* NGC 346 MPG 595 * 00 59 11.959 -72 10 56.10 14.44 15.26 15.47   15.72 B0III 8 0
42 [GDB2006] 20 * 00 59 12.280 -72 11 07.66           O7V 1 0
43 Cl* NGC 346 KWBBE 448 Ae* 00 59 12.284 -72 09 58.45   14.818 15.072     ~ 12 0
44 [GDB2006] 21 * 00 59 12.660 -72 11 08.84           O6V 1 0
45 Cl* NGC 346 MPG 617 Pu* 00 59 12.8202717960 -72 10 52.384061029 13.87 14.83 14.83   15.02 O9.5V 5 0
46 [GDB2006] 18 * 00 59 14.500 -72 11 59.53           B0V 1 0
47 [GDB2006] 31 * 00 59 15.480 -72 11 11.44           O6V 1 0
48 [HGH2008] Cluster 2 Cl* 00 59 16.325 -72 09 19.87           ~ 2 1
49 2MASS J00591709-7209154 Y*? 00 59 17.09 -72 09 15.5           ~ 3 0
50 Cl* NGC 346 ELS 22 * 00 59 18.6176208672 -72 11 09.887619084   14.65 14.91     O9V 20 0
51 [SBW2007b] 42 Y*O 00 59 19.00 -72 09 30.5           ~ 4 0
52 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 240 0
53 [MA93] 1148 Em* 00 59 28.756 -72 10 16.69 13.99 15.09 15.16   14.98 B0V 11 0
54 [HGH2008] Cluster 1 As* 00 59 30.8 -72 09 10           ~ 7 0
55 NGC 602 Cl* 01 29 32.133 -73 33 38.13     13.018     ~ 90 1
56 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1357 0
57 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 261 0
58 DEM L 103 HII 05 13 07.1 -69 01 56           ~ 8 0
59 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17438 0
60 NGC 1948 As* 05 24 20.00 -66 24 12.0   10.81 10.61     ~ 105 0
61 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2332 0
62 Cl Collinder 69 OpC 05 35 10.1 +09 48 47     2.8     ~ 313 0
63 NAME Ori I As* 05 38 -02.8           ~ 615 0
64 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 567 0
65 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1231 2
66 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 806 0
67 NAME Upper Sco Association As* 16 12 -23.4           ~ 1369 1
68 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1

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