2001A&A...372..495H


Query : 2001A&A...372..495H

2001A&A...372..495H - Astronomy and Astrophysics, volume 372, 495-507 (2001/6-3)

HST study of the LMC compact star-forming region N83B.

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

Abstract (from CDS):

High resolution imaging with the Hubble Space Telescope has uncovered the thus far hidden stellar content and the nebular features of the high excitation compact HII region N83B in the Large Magellanic Cloud (LMC). We discover that the HII region is powered by the most recent massive starburst in the OB association LH5 and the burst has created about 20 blue stars spread over ∼30'' -.1cm on the sky (7.5 pc). Globally N83B displays a turbulent environment typical of newborn massive star formation sites. It contains an impressive ridge, likely created by a shock and a cavity with an estimated age of only ∼30000 yr, sculpted in the ionized gas by the powerful winds of massive stars. The observations bring to light two compact HII blobs, N83B-1 and N83B-2, and a small arc-nebula, N83B-3, lying inside the larger HII region. N83B-1, only ∼2.8" (0.7pc) across, is the brightest and most excited part of N83B. It harbors the presumably hottest star of the burst and is also strongly affected by dust with an extinction of AV=2.5mag. The second blob, N83B-2, is even more compact, with a size of only ∼1'' (0.3pc). All three features are formed in the border zone between the molecular cloud and the ionized gas possibly in a sequential process triggered by the ionization front of an older HII region. Our HST imaging presents an interesting and rare opportunity to observe details in the morphology of star formation on very small spatial scales in the LMC which are in agreement with the concept of the fractal structure of molecular star-forming clouds. A scenario which supports hierarchical massive star formation in the LMC OB association LH5 is presented.

Abstract Copyright:

Journal keyword(s): stars: early-type - dust, extinction - HII regions - individual objects: N83B - galaxies: Magellanic Clouds

Nomenclature: Fig.3: [HVL90] N83 B-N (Nos B-2, B-3). Table 3: [HCD2001] N83B NN (Nos 1-36).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 50

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Number of rows : 50
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 LHA 120-N 83A HII 04 53 59 -69 11.6           ~ 26 1
2 LHA 120-N 83C EmO 04 54 01 -69 09.4           ~ 6 0
3 NGC 1743 Cl* 04 54 03 -69 12.1     11.26     ~ 38 2
4 SK -69 25 * 04 54 03.685 -69 11 56.77 10.993 12.054 11.886   12.230 OB 5 0
5 NGC 1737 HII 04 54 06.5 -69 11 26           ~ 13 0
6 HD 268757 s*y 04 54 14.2560317739 -69 12 36.443730943 15.702 11.662 10.157 9.21 8.52 G8_0 73 0
7 LHA 120-N 83 HII 04 54 15 -69 10.6           ~ 37 0
8 [HCD2001] N83B 1 * 04 54 22.70 -69 10 59.0           ~ 1 0
9 [HCD2001] N83B 2 * 04 54 23.30 -69 10 59.2           ~ 1 0
10 [HCD2001] N83B 4 * 04 54 23.40 -69 11 08.2           ~ 1 0
11 [HCD2001] N83B 5 * 04 54 23.70 -69 11 04.8           ~ 1 0
12 [HCD2001] N83B 3 * 04 54 23.90 -69 10 49.9           ~ 1 0
13 [HCD2001] N83B 7 * 04 54 24.00 -69 11 03.6           ~ 1 0
14 [HCD2001] N83B 9 * 04 54 24.30 -69 11 06.5           ~ 1 0
15 [HCD2001] N83B 18 * 04 54 24.40 -69 11 12.3           ~ 1 0
16 [HCD2001] N83B 12 * 04 54 24.40 -69 11 05.2           ~ 1 0
17 NGC 1748 As* 04 54 24.6 -69 11 01   12.750 12.3     ~ 58 2
18 [HCD2001] N83B 10 * 04 54 24.70 -69 10 59.9           ~ 1 0
19 [HCD2001] N83B 11 * 04 54 24.70 -69 10 59.8           ~ 1 0
20 [HCD2001] N83B 16 * 04 54 24.80 -69 11 05.1           ~ 1 0
21 [HCD2001] N83B 6 * 04 54 24.80 -69 10 49.2           ~ 1 0
22 [HCD2001] N83B 17 * 04 54 24.90 -69 11 03.7           ~ 1 0
23 [HCD2001] N83B 14 * 04 54 24.90 -69 11 00.6           ~ 1 0
24 [HCD2001] N83B 8 * 04 54 24.90 -69 10 57.1           ~ 1 0
25 [HCD2001] N83B 15 * 04 54 25.00 -69 11 00.2           ~ 1 0
26 [HCD2001] N83B 13 * 04 54 25.00 -69 10 56.9           ~ 1 0
27 [HCD2001] N83B 21 * 04 54 25.20 -69 11 02.8           ~ 1 0
28 [HCD2001] N83B 19 * 04 54 25.20 -69 11 01.9           ~ 1 0
29 LHA 120-N 83B HII 04 54 25.2 -69 11 00           ~ 47 1
30 [HCD2001] N83B 24 * 04 54 25.50 -69 11 04.4           ~ 1 0
31 [HCD2001] N83B 20 * 04 54 25.50 -69 10 56.5           ~ 1 0
32 [HCD2001] N83B 25 * 04 54 25.60 -69 11 05.6           ~ 1 0
33 [HCD2001] N83B 22 * 04 54 25.70 -69 10 56.9           ~ 1 0
34 [HCD2001] N83B 26 * 04 54 25.80 -69 11 02.1           ~ 1 0
35 [HCD2001] N83B 23 * 04 54 25.80 -69 10 58.9           ~ 1 0
36 [HCD2001] N83B 30 * 04 54 25.90 -69 11 07.3           ~ 1 0
37 [HCD2001] N83B 28 * 04 54 25.90 -69 11 05.5           ~ 1 0
38 [HVL90] N83 B-3 ? 04 54 26 -69 11.0           ~ 3 0
39 [HVL90] N83 B-2 HII 04 54 26 -69 11.0           ~ 4 0
40 [HCD2001] N83B 33 * 04 54 26.20 -69 11 08.2           ~ 1 0
41 [HCD2001] N83B 32 * 04 54 26.20 -69 11 08.1           ~ 1 0
42 [HCD2001] N83B 29 * 04 54 26.20 -69 11 01.5           ~ 1 0
43 [HCD2001] N83B 31 * 04 54 26.30 -69 11 02.9           ~ 1 0
44 OGLE LMC-ECL-27455 EB* 04 54 26.42 -69 11 10.0     15.414   15.504 ~ 2 0
45 [HCD2001] N83B 27 * 04 54 26.80 -69 10 47.1           ~ 1 0
46 DEM L 22d HII 04 54 27 -69 09.8           ~ 5 0
47 [HCD2001] N83B 35 * 04 54 27.30 -69 11 03.4           ~ 1 0
48 Brey 4 WR* 04 54 28.0893580594 -69 12 50.796987783 15.957 16.715 16.742   16.363 WN2b 28 0
49 [HCD2001] N83B 36 * 04 54 28.80 -69 10 51.9           ~ 1 0
50 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15464 1

    Equat.    Gal    SGal    Ecl

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2021.07.27-13:35:37

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