1999A&A...344..848H

Query : 1999A&A...344..848H

1999A&A...344..848H - Astronomy and Astrophysics, volume 344848-856 (1999/4-3)

Very young massive stars in the Small Magellanic Cloud, revealed by HST.

HEYDARI-MALAYERI M., ROSA M.R., ZINNECKER H., DEHARVENG L. and CHARMANDARIS V.

Abstract (from CDS):

High spatial resolution imaging with the Hubble Space Telescope allowed us to resolve the compact HII region N 81 lying in the Small Magellanic Cloud (SMC). We show the presence of a tight cluster of newborn massive stars embedded in this nebular ``blob'' of ∼10" across. This is the first time the stellar content and internal morphology of such an object is uncovered. These are among the youngest massive stars in this galaxy accessible to direct observations at ultraviolet and optical wavelengths. Six of them are grouped in the core region of ∼2" diameter, with a pair of the main exciting stars in the very center separated by only 0.27" or 0.08pc. The images display violent phenomena such as stellar winds, shocks, ionization fronts, typical of turbulent starburst regions. Since the SMC is the most metal-poor galaxy observable with very high angular resolution, these observations provide important templates for studying star formation in the very distant metal-poor galaxies which populate the early Universe.

Abstract Copyright: ∼

Journal keyword(s): stars: early-type - stars: Wolf-Rayet - ISM: dust, extinction - ISM: HII regions - ISM: individual objects: N 81 (SMC) - galaxies: Magellanic Clouds

Nomenclature: Table 1: [HRZ99] NN N=19 among 37.

Simbad objects: 41

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Number of rows : 41
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 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 547 0
3 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 251 0
4 SNR B0102-72.3 SNR 01 04 01.2 -72 01 52           ~ 422 1
5 LHA 115-N 78 HII 01 05 12.8 -72 00 38           ~ 35 1
6 LHA 115-N 80 Em* 01 08 09.9 -71 59 50     14.1     ~ 33 0
7 [HRZ99] 16 * 01 09 11.22 -73 11 48.9           ~ 1 0
8 [HMC2003b] 111 * 01 09 11.69 -73 11 45.0           ~ 2 0
9 [HMC2003b] 119 * 01 09 12.82 -73 11 40.2           ~ 3 0
10 S3MC J010912.68-731138.43 * 01 09 12.83 -73 11 38.3           ~ 3 0
11 HD 7113 Em* 01 09 12.94464 -73 11 38.8968     11.7     ~ 131 0
12 2MASS J01091297-7311238 * 01 09 12.9749458992 -73 11 23.680495428           ~ 2 0
13 [HRZ99] 2 * 01 09 13.03 -73 11 38.0     14.87     O6.5 5 0
14 [HMC2003b] 122 * 01 09 13.05 -73 11 38.3     14.38     O7 5 0
15 [HMC2003b] 125 * 01 09 13.22 -73 11 46.4           ~ 2 0
16 [HRZ99] 6 * 01 09 13.28 -73 11 38.4           ~ 1 0
17 [HRZ99] 5 * 01 09 13.28 -73 11 37.6           ~ 2 0
18 [HMC2003b] 127 * 01 09 13.35 -73 11 38.4     16.10     O8.5 5 0
19 [HRZ99] 7 * 01 09 13.43 -73 11 39.3           ~ 2 0
20 [HRZ99] 9 * 01 09 13.54 -73 11 36.0           ~ 1 0
21 [HMC2003b] 130 * 01 09 13.74 -73 11 33.3     15.74     O7.5 5 0
22 [HRZ99] 10 * 01 09 13.90 -73 11 34.2           ~ 2 0
23 [HMC2003b] 141 * 01 09 15.61 -73 11 35.6           ~ 2 0
24 [HMC2003b] 143 * 01 09 16.08 -73 11 29.1           ~ 3 0
25 [HMC2003b] 147 * 01 09 16.58 -73 11 51.2           ~ 2 0
26 [HMC2003b] 145 * 01 11 41.6 -73 11 43           ~ 2 0
27 NGC 456 HII 01 13 44.4 -73 17 26           ~ 132 0
28 LHA 115-N 84 HII 01 14 27.7 -73 12 51           ~ 68 0
29 LHA 115-N 88A HII 01 24 07.823 -73 09 03.77   13.25 12.18     ~ 83 1
30 LHA 115-N 88 HII 01 24 08.1 -73 09 04           ~ 72 1
31 LHA 115-N 89 HII 01 25 53.9 -73 22 41           ~ 23 0
32 LHA 115-N 90 HII 01 29 30.15 -73 33 10.5           ~ 69 2
33 LHA 120-N 83B HII 04 54 25.2 -69 11 00           ~ 48 1
34 IRAS 04571-6627 mul 04 57 15.5 -66 23 14           ~ 53 1
35 HD 32340 Em* 04 57 16.253 -66 23 20.94   13.11 12.45 14.00   O3-O6V 78 0
36 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
37 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
38 [JHS86] N160A-9 HII 05 39 43.3 -69 38 51           ~ 23 0
39 [GSL2002] 122 HII 05 39 46.1 -69 38 37           ~ 23 0
40 NAME N159 Blob in LMC HII 05 40 04.2 -69 44 43           ~ 40 0
41 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1

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