2002AJ....124.3325N


Query : 2002AJ....124.3325N

2002AJ....124.3325N - Astron. J., 124, 3325-3335 (2002/December-0)

Structure and dynamics of candidate O star bubbles in N44.

NAZE Y., CHU Y.-H., GUERRERO M.A., OEY M.S., GRUENDL R.A. and SMITH R.C.

Abstract (from CDS):

Dynamical studies of superbubbles and Wolf-Rayet ring nebulae show discrepancies from the standard adiabatic model for windblown bubbles. We therefore study the physical properties and kinematics of three candidate bubbles blown by single O stars to evaluate whether these discrepancies are also found in these simpler objects. Our sample candidates are N44 F, N44 J, and N44 M, in the outskirts of the H II complex N44 in the Large Magellanic Cloud. We have obtained ground-based and Hubble Space Telescope emission-line images and high-dispersion echelle spectra for these objects. From the Hα luminosities and the [O III]/Hα ratios of these nebulae, we estimate the spectral types of the ionizing stars to be O7 V, O9.5 V, and O9.5 V for N44 F, N44 J, and N44 M, respectively. We find that the observed expansion velocity of 12 km.s–1 for N44 F is consistent with the stellar wind luminosity expected from the central ionizing star, as predicted by the standard bubble model. The observed upper limits for the expansion velocities of N44 J and N44 M are also compatible with the expected values, within the uncertainties. We also report the discovery in N44 F of strongly defined dust columns, similar to those seen in the Eagle Nebula. The photoevaporation of these dense dust features may be kinematically important and may actually govern the evolution of the shell. The inclusion of photoevaporation processes may thus undermine the apparent agreement between the observed bubble dynamics and the simple adiabatic models.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: Bubbles - ISM: Individual: N44 - ISM: Kinematics and Dynamics - Galaxies: Magellanic Clouds

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5575 1
2 HD 269404 PN 05 21 29.7150591648 -67 51 06.801614388 14.32 14.96 14.17   14.00 ~ 31 0
3 LHA 120-N 44J HII 05 21 37.3496737104 -67 46 32.491657128           ~ 14 0
4 NGC 1929 Cl* 05 21 38.16 -67 54 43.2   14.0       ~ 25 0
5 NGC 1935 As* 05 21 58 -67 57.3           ~ 107 0
6 LHA 120-N 44 EmO 05 22 06.9 -67 56 46           ~ 187 1
7 IC 2127 EmO 05 22 12.532 -67 58 31.92     11.60     ~ 95 1
8 LHA 120-N 44G EmO 05 22 20 -68 04.6           ~ 8 0
9 LHA 120-N 44K EmO 05 22 21 -68 04.4     13.25     ~ 8 0
10 LHA 120-N 44I HII 05 22 26.6 -67 54 16   10.45 10.37     ~ 34 2
11 NGC 1937 As* 05 22 29 -67 53.7           ~ 45 1
12 LHA 120-N 44H EmO 05 22 48.43 -68 01 09.8           ~ 12 0
13 LH 49 As* 05 22 55 -68 03.6           ~ 31 1
14 IC 2128 HII 05 23 01.0 -68 02 13     11.10     ~ 41 1
15 LHA 120-N 44L HII 05 23 06.0 -68 00 17           ~ 12 0
16 LHA 120-N 44E HII 05 23 12.5 -68 00 18           ~ 11 0
17 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16417 1
18 LHA 120-N 44M HII 05 23 39.5 -68 00 43           ~ 11 0
19 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1127 2
20 M 16 OpC 18 18 45 -13 47.5   6.58 6.0     ~ 1000 2

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2022.12.08-14:00:45

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