2008AJ....135.1291V

Query : 2008AJ....135.1291V

2008AJ....135.1291V - Astron. J., 135, 1291-1300 (2008/April-0)

A re-examination of observed and predicted stellar ionizing fluxes in the Large Magellanic Cloud.

VOGES E.S., OEY M.S., WALTERBOS R.A.M. and WILKINSON T.M.

Abstract (from CDS):

We use Hα luminosities of H II regions in the Large Magellanic Cloud to test the latest generation of hot-star atmosphere models. These newer models predict softer spectral energy distributions, and imply that less ionizing radiation escapes from classical H II regions than found in our previous study. Our analysis is based on a sample of 14 objects that have comprehensive inventories of spectroscopic classifications for the ionizing stars, and we also present a larger sample of 39 objects for which stellar properties are more roughly estimated from broadband photometry. Although the latter sample offers crude constraints, the results are fully consistent with, and support those from, the former sample. We find that the latest stellar atmosphere models predict that only 20-30% of H II regions are density bounded. This is consistent with the shell-like and filamentary morphology seen in those candidates. With these results, the total photon budget may not provide enough Lyman continuum radiation to account for the diffuse, warm ionized medium.

Abstract Copyright: ∼

Journal keyword(s): galaxies: ISM - H II regions - ISM: general - Magellanic Clouds - stars: atmospheres - stars: early-type

Simbad objects: 53

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Number of rows : 53
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 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
4 DEM L 1 HII 04 47 19.5 -69 18 27           ~ 6 0
5 LHA 120-N 77D HII 04 48 54.6681511104 -69 09 45.982366776           ~ 15 0
6 LHA 120-N 77E HII 04 49 47 -69 12.0           ~ 13 0
7 LHA 120-N 3 HII 04 50 08.0 -67 42 10           ~ 13 0
8 BRHT 1a Cl* 04 51 51.3 -69 23 26           ~ 42 0
9 NGC 1722 HII 04 51 53.36 -69 23 25.9           ~ 77 0
10 LHA 120-N 79 HII 04 52 00 -69 22.5           ~ 75 1
11 NGC 1727 HII 04 52 13.0 -69 20 20           ~ 52 0
12 LHA 120-N 5 EmO 04 52 34.4 -67 17 23           ~ 18 0
13 DEM L 14 HII 04 52 47.1 -68 54 40           ~ 6 0
14 LHA 120-N 81A HII 04 52 47.5 -69 12 58           ~ 14 1
15 LHA 120-N 81 reg 04 52 56 -69 13.5           ~ 15 1
16 LHA 120-N 8A HII 04 53 06.3 -68 02 38           ~ 17 0
17 LHA 120-N 185 EmO 04 53 58.9 -70 00 53           ~ 40 0
18 LHA 120-N 80 HII 04 54 13.4 -68 21 52           ~ 17 0
19 LHA 120-N 83 HII 04 54 15 -69 10.6           ~ 43 0
20 SNR J045447-662528 SNR 04 54 48.00 -66 25 42.0           ~ 111 0
21 LHA 120-N 9 HII 04 55 10.9 -67 11 32           ~ 55 1
22 LHA 120-N 84 EmO 04 55 34.5 -68 25 39           ~ 17 0
23 NAME LMC B0455-6843 SNR 04 55 55.9 -68 38 29           ~ 69 1
24 DEM L 34 HII 04 56 34.3 -66 26 52           ~ 103 0
25 LHA 120-N 92A EmO 04 57 09 -68 45.3           ~ 7 0
26 LHA 120-N 186 EmO 04 59 45.5 -70 09 45           ~ 40 0
27 DEM L 55 HII 05 01 50.5 -70 38 37           ~ 10 0
28 DEM L 68 HII 05 05 13 -70 07.0           ~ 13 0
29 LHA 120-N 103B EmO 05 08 47.8 -68 45 39           ~ 244 1
30 SNR J050854-684447 SNR 05 08 59.26 -68 43 33.9           ~ 157 2
31 LHA 120-N 105A HII 05 09 34.3 -68 53 45           ~ 58 1
32 DEM L 103 HII 05 13 07.1 -69 01 56           ~ 8 0
33 DEM L 104 HII 05 13 18.0 -69 22 47           ~ 17 0
34 DEM L 106 HII 05 13 53.1 -67 27 05           ~ 33 0
35 DEM L 128 HII 05 17 46.0 -68 47 04           ~ 8 0
36 NGC 1918 SNR 05 19 04.50 -69 38 56.0           ~ 105 0
37 LHA 120-N 128 HII 05 22 16.3 -68 38 58           ~ 10 0
38 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
39 DEM L 174 HII 05 24 22 -68 31.8           ~ 14 0
40 LHA 120-N 138 EmO 05 24 33 -68 30.4           ~ 11 0
41 DEM L 178 HII 05 24 34.2 -69 27 09           ~ 7 0
42 LHA 120-N 51D HII 05 25 17.3 -67 22 47           ~ 119 0
43 LHA 120-N 143 HII 05 26 28.6 -69 18 58   11.32 11.52     ~ 23 1
44 DEM L 196 HII 05 26 32.8 -67 38 52           ~ 14 0
45 LHA 120-N 144 HII 05 26 42.5 -68 49 34           ~ 72 0
46 LHA 120-N 148C Cl* 05 31 52 -68 32.8           ~ 25 0
47 LHA 120-N 148I EmO 05 32 01.7 -68 40 24           ~ 19 0
48 LHA 120-N 57A HII 05 32 28.2 -67 42 11           ~ 52 1
49 NGC 2030 HII 05 35 33.6 -66 02 26           ~ 75 0
50 DEM L 250 HII 05 36 39.8 -67 26 51           ~ 10 0
51 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
52 NGC 2103 As* 05 41 38.1 -71 19 49     10.82     ~ 58 0
53 LHA 120-N 70 HII 05 43 17.5 -67 50 48           ~ 85 0

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