2002A&A...389..286M

Query : 2002A&A...389..286M

2002A&A...389..286M - Astronomy and Astrophysics, volume 389286-294 (2002/7-1)

The stellar content, metallicity and ionization structure of HII regions.

MARTIN-HERNANDEZ N.L., VERMEIJ R., TIELENS A.G.G.M., VAN DER HULST J.M. and PEETERS E.

Abstract (from CDS):

Observations of infrared fine-structure lines provide direct information on the metallicity and ionization structure of HII regions and indirectly on the hardness of the radiation field ionizing these nebulae. We have analyzed a sample of Galactic and Magellanic Cloud HII regions observed by the Infrared Space Observatory (ISO) to examine the interplay between stellar content, metallicity and the ionization structure of HII regions. The observed [SIV]10.5/[SIII]18.7µm and [NeIII]15.5/[NeII]12.8µm line ratios are shown to be highly correlated over more than two orders of magnitude. We have compared the observed line ratios to the results of photoionization models using different stellar energy distributions. The derived characteristics of the ionizing star depend critically on the adopted stellar model as well as the (stellar) metallicity. We have compared the stellar effective temperatures derived from these model studies for a few well-studied HII regions with published direct spectroscopic determinations of the spectral type of the ionizing stars. This comparison supports our interpretation that stellar and nebular metallicity influences the observed infrared ionic line ratios. We can explain the observed increase in degree of ionization, as traced by the [SIV]/[SIII] and [NeIII]/[NeII] line ratios, by the hardening of the radiation field due to the decrease of metallicity. The implications of our results for the determination of the ages of starbursts in starburst galaxies are assessed.

Abstract Copyright: ∼

Journal keyword(s): stars: atmospheres - stars: early-type - ISM: abundances - ISM: HII regions - galaxies: starburst - galaxies: individual: Milky Way - Magellanic Clouds

CDS comments: Table 1: IRAS 02219+6125 is a misprint for IRAS 02219+6152. N160A1 and N160A2 = [HT86] N160A1 and A2. N159-5 = [HT82] 5.

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 - 2026 		#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 251 0
4 GAL 124.64+02.54 HII 01 07 50.70 +65 21 21.4           ~ 52 0
5 HD 7113 Em* 01 09 12.94464 -73 11 38.8968     11.7     ~ 131 0
6 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 367 0
7 NGC 1714 EmO 04 52 08.4 -66 55 23   11.51 11.61     ~ 88 2
8 LHA 120-N 83B HII 04 54 25.2 -69 11 00           ~ 48 1
9 IRAS 04571-6627 mul 04 57 15.5 -66 23 14           ~ 53 1
10 HD 32340 Em* 04 57 16.253 -66 23 20.94   13.11 12.45 14.00   O3-O6V 78 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
12 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
13 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
14 [VPT2002] 30 Dor 1 HII 05 38 33.5 -69 06 27           ~ 7 0
15 [GSL2002] 114 HII 05 38 35.4 -69 05 41           ~ 8 0
16 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
17 [VPT2002] 30 Dor 3 HII 05 38 46.0 -69 05 08           ~ 8 0
18 [VPT2002] 30 Dor 4 HII 05 38 54.2 -69 05 15           ~ 7 0
19 [JHS86] N160A-9 HII 05 39 43.3 -69 38 51           ~ 23 0
20 [GSL2002] 122 HII 05 39 46.1 -69 38 37           ~ 23 0
21 NAME N159 Blob in LMC HII 05 40 04.2 -69 44 43           ~ 40 0
22 UGCA 116 AGN 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 561 0
23 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
24 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 920 2
25 [BNM96] 289.880-0.799 HII 11 00 59.4892543320 -60 50 22.768640052           ~ 36 0
26 GRS G291.86 -00.68 HII 11 16 33.8 -61 29 59           ~ 21 0
27 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1364 1
28 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
29 NGC 4039 GiP 12 01 53.51 -18 53 10.3   11.08   9.77   ~ 1173 1
30 ESO 95-1 HII 12 09 01.260 -63 15 59.63     16.00     ~ 96 2
31 IRAS 12073-6233 mul 12 10 00.4 -62 49 57           ~ 51 0
32 [GS70] 298.2-00.3 HII 12 10 01.886 -62 50 00.46           ~ 67 1
33 IRAS 12331-6134 HII 12 36 01.9 -61 51 04           ~ 23 0
34 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
35 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
36 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
37 IRAS 15384-5348 HII 15 42 17.787 -53 58 30.88           ~ 41 1
38 IRAS 15502-5302 HII 15 54 07.2 -53 11 20           ~ 51 0
39 IRAS 17221-3619 HII 17 25 33 -36 21.7           ~ 36 0
40 NAME Sgr D HII HII 17 48 41.79 -28 01 41.3           ~ 69 1
41 GAL 013.875+00.28 HII 18 14 35.2 -16 45 21           ~ 99 0
42 [WAM82] 023.955+0.152 HII 18 34 24.9 -07 54 50           ~ 70 1
43 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 385 0
44 RAFGL 5536 HII 18 50 30.8 -00 01 59           ~ 48 0
45 RAFGL 5541 Y*O 18 52 50.26 +00 55 29.6           ~ 122 1
46 W 58a HII 20 01 45.8 +33 32 43           ~ 294 4
47 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
48 IRAS 21190+5140 HII 21 20 44.84 +51 53 27.5           ~ 133 2
49 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 180 2
50 NGC 7552 Sy1 23 16 10.66 -42 35 04.7 11.34 11.22 10.57 10.08 11.1 ~ 574 3

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