2008ApJ...680..398L


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.20CET03:31:14

2008ApJ...680..398L - Astrophys. J., 680, 398-419 (2008/June-2)

Chemical composition and mixing in giant H II regions: NGC 3603, 30 Doradus, and N66.

LEBOUTEILLER V., BERNARD-SALAS J., BRANDL B., WHELAN D.G., WU Y., CHARMANDARIS V., DEVOST D. and HOUCK J.R.

Abstract (from CDS):

We investigate the chemical abundances of NGC 3603 in the Milky Way, of 30 Doradus in the Large Magellanic Cloud, and of N66 in the Small Magellanic Cloud. Mid-infrared observations with the Infrared Spectrograph on board the Spitzer Space Telescope allow us to probe the properties of distinct physical regions within each object, the central ionizing cluster, the surrounding ionized gas, photodissociation regions, and buried stellar clusters. We detect [S III], [S IV], [Ar III], [Ne II], [Ne III], [Fe II], and [Fe III] lines and derive the ionic abundances. Based on the ionic abundance ratio (Ne III/H)/(S III/H), we find that the gas observed in the MIR is characterized by a lower degree of ionization than the gas observed in the optical spectra. We compute the elemental abundances of Ne, S, Ar, and Fe. We find that the α-elements Ne, S, and Ar scale with each other. Our determinations agree well with the abundances derived from the optical. The Ne/S ratio is higher than the solar value in the three giant H II regions and points toward a moderate depletion of sulfur on dust grains. We find that the neon and sulfur abundances display a remarkably small dispersion (0.11 dex in 15 positions in 30 Doradus), suggesting a relatively homogeneous ISM, even though small-scale mixing cannot be ruled out.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - Infrared: ISM - ISM: Atoms - ISM: Individual: NGC Number: NGC 3603 - ISM: Individual: Name: 30 Doradus - ISM: Individual: Alphanumeric: N66

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9228 1
2 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 443 0
3 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 216 0
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5071 1
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14543 1
6 M 42 HII 05 35 17.3 -05 23 28           ~ 3684 0
7 NGC 2060 SNR 05 37 51.4470067818 -69 10 23.957283532   9.69 9.59     ~ 317 2
8 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1029 2
9 RRG 30 Dor W IRS 4a * 05 38 38.45 -69 06 30.7           ~ 4 0
10 RMC 136 Cl* 05 38 42.396 -69 06 03.36   9.63 9.50     ~ 1698 2
11 NAME Walborn 2 ** 05 38 48.1018 -69 04 42.239   15.66 15.39     O2V((f*))z 25 0
12 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 985 1
13 NAME Car Arm PoG 10 00 -60.0           ~ 372 1
14 HD 97950 Cl* 11 15 07.346 -61 15 38.52 9.64 9.83 9.03 9.69   WR 182 2
15 [FPA77] NGC 3603 IRS 9A IR 11 15 11.34 -61 16 45.2           ~ 18 0
16 NGC 3603 HII 11 15 24 -61 15.0           ~ 929 2
17 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2187 2
18 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11251 0
19 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1469 0
20 NAME Lockman Hole Northwest reg ~ ~           ~ 13 0
21 NAME Local Group GrG ~ ~           ~ 6801 0

    Equat.    Gal    SGal    Ecl

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2020.02.20-03:31:14

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