2011A&A...529A..40S


Query : 2011A&A...529A..40S

2011A&A...529A..40S - Astronomy and Astrophysics, volume 529A, 40-40 (2011/5-1)

An interesting candidate for isolated massive-star formation in the Small Magellanic Cloud.

SELIER R., HEYDARI-MALAYERI M. and GOULIERMIS D.A.

Abstract (from CDS):

The region of the Small Magellanic Cloud (SMC) with which this paper is concerned contains the highest concentration of IRAS/Spitzer sources, HI emission, and molecular clouds in this neighboring galaxy. However, it has been the target of very few studies, despite this evidence of star formation. We present the first detailed study of the compact HII region N33 in the SMC by placing it in a wider context of massive star formation. Moreover, we show that N33 is a particularly interesting candidate for isolated massive star formation. This analysis is based mainly on optical ESO NTT observations, both imaging and spectroscopy, coupled with other archive data, notably Spitzer images (IRAC 3.6, 4.5, 5.8, and 8.0µm) and 2MASS observations. We derive a number of physical characteristics of the compact HII region N33 for the first time. This gas and dust formation of 7.4" (2.2pc) in diameter is powered by a massive star of spectral type O6.5-O7V. The compact HII region belongs to a rare class of HII regions in the Magellanic Clouds, called high-excitation blobs (HEBs). We show that this HII region is not related to any star cluster. Specifically, we do not find any traces of clustering around N33 on scales larger than 10'' (∼3pc). On smaller scales, there is a marginal stellar concentration, the low density of which, below the 3σ level, does not classify it as a real cluster. We also verify that N33 is not a member of any large stellar association. Under these circumstances, N33 is also therefore attractive because it represents a remarkable case of isolated massive-star formation in the SMC. Various aspects of the relevance of N33 to the topic of massive-star formation in isolation are discussed.

Abstract Copyright:

Journal keyword(s): HII regions - stars: early-type - stars: formation - stars: fundamental parameters - ISM: individual objects: N33 - Magellanic Clouds

Nomenclature: Fig. 2, Table 1: [SHG2011] N33-NN (Nos 1-13).

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* T Phe Mi* 00 30 26.2337742744 -46 24 33.379722396   12.46 11.43 12.43   M7e 68 0
2 LHA 115-N 23 Em* 00 47 57.4 -73 17 38     15     ~ 23 0
3 NGC 267 HII 00 48 02.6 -73 16 39           ~ 52 0
4 LHA 115-N 30 Em* 00 49 01.8 -73 08 24     14.9     ~ 33 0
5 DEM S 44 HII 00 49 12.0 -73 28 19           ~ 6 0
6 [SHG2011] N33-8 * 00 49 13.7748936720 -73 26 15.270073512 17.45 16.12 14.56 14.32 13.17 ~ 3 0
7 [SHG2011] N33-11 * 00 49 18.4026807840 -73 27 31.238415864 17.59 16.42 15.13 14.57 13.75 ~ 3 0
8 UCAC2 1000511 * 00 49 22.7695233624 -73 25 52.867651692   15.37 15.01 14.81 14.49 ~ 1 0
9 UCAC2 1000517 * 00 49 24.3213469608 -73 26 44.970452592   12.43 11.65 11.26 10.83 G5V 3 0
10 [WSH2003] e-28 IR 00 49 27 -73 26.8           ~ 2 0
11 [SHG2011] N33-3 * 00 49 28.840 -73 26 35.28   17.78 17.50 17.40   ~ 1 0
12 LHA 115-N 33 Em* 00 49 29.32080 -73 26 34.7208   16.28 15.92 15.74 14.70 O6.5-7V 22 0
13 [SHG2011] N33-2 * 00 49 29.620 -73 26 35.70   17.46 16.39 15.78   ~ 1 0
14 SkKM 47 s*r 00 49 30.3878174760 -73 26 50.174825928 16.88 15.44 13.68 12.51 11.75 K2-K3Iab-II 12 0
15 RX J0049.8-7324 X 00 49 30.4 -73 26 58           ~ 9 1
16 UCAC2 1000560 * 00 49 36.7941561840 -73 27 54.236641716   14.48 13.89 13.53 13.06 ~ 1 0
17 UCAC2 1000568 * 00 49 39.3505846464 -73 27 16.935589260   15.08 15.27 15.40 15.48 ~ 1 0
18 UCAC2 1000569 * 00 49 39.5114132760 -73 26 12.094428552   17.47 16.10 15.38 14.68 ~ 1 0
19 2MASS J00494166-7326405 * 00 49 41.6943789192 -73 26 40.649128872   13.81 13.04 12.64 12.22 ~ 1 0
20 UCAC3 34-5555 * 00 49 43.1481387144 -73 26 35.816408556   15.21 15.03 14.92 14.64 ~ 1 0
21 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10317 1
22 SA 92- reg 00 55 03.80 +00 47 13.2           ~ 99 0
23 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 462 0
24 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 226 0
25 NAME SMC Bar PoG 01 05 -72.6           ~ 214 0
26 HD 7113 Em* 01 09 13.066 -73 11 38.92     11.7     ~ 118 0
27 NGC 456 HII 01 13 44.4 -73 17 26           ~ 120 0
28 LHA 115-N 84 HII 01 14 27.7 -73 12 51           ~ 62 0
29 LHA 115-N 88A HII 01 24 07.823 -73 09 03.77   13.25 12.18     ~ 70 1
30 LHA 115-N 90 HII 01 29 30.15 -73 33 10.5           ~ 58 1
31 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6373 1
32 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1228 0
33 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3975 0
34 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16158 1
35 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4099 4
36 LP 916-15 PM* 15 38 59.6479538952 -28 35 36.973634856   12.19 11.62     A 109 0
37 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3375 1
38 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13094 0
39 CD-44 12736 PM* 18 36 25.9502475648 -44 18 36.907592904   10.83 10.22     G0 202 0
40 CD-30 17706 WD* 20 10 56.8486912016 -30 13 06.627142663 11.654 12.286 12.242 12.311 12.381 DA3.1 234 0

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2022.08.15-15:55:44

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