1999AJ....117.1249D

Query : 1999AJ....117.1249D

1999AJ....117.1249D - Astron. J., 117, 1249-1274 (1999/March-0)

The ionizing star clusters of giant H II regions in NGC 2403.

DRISSEN L., ROY J.-R., MOFFAT A.F.J. and SHARA M.M.

Abstract (from CDS):

We present the results of a study on the massive star population down to about MV~-3.1, or 12-15 M☉, of the most luminous giant H II regions in the nearby spiral galaxy NGC 2403, based on Hubble Space Telescope images and ground-based spectrograms. Particular emphasis is placed on the distribution of the Wolf-Rayet and red supergiant stars and the information they provide about the recent star-forming history of these large complexes. We find direct evidence for the presence of Wolf-Rayet (WR) stars in five of the six giant H II regions investigated; 25-40 WR stars are inferred for the sole NGC 2403-I giant H II region. Red supergiant (RSG) stars are mainly distributed over a more extended halo, while the young blue stars and most WR stars are in or close to a compact core. One appears to be seeing young cores of O and WR stars surrounded by older halos containing red supergiants. We propose a scenario in which RSG stars belonging to an early phase of star formation were followed by a more recent burst corresponding to a very blue mean sequence. Delayed trigger with preheating over several 100 pc by the first generation of massive stars allowed the build-up of the required confinement for the production of parsec-scale cluster cores with luminosity up to a few times 106 L☉. Finally, we present some interesting objects found in the field of NGC 2403 outside the giant H II regions, such as field WR stars, globular clusters and background galaxies.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 2403 - ISM: H II Regions - Stars: Evolution - Stars: Wolf-Rayet

Nomenclature: Table 1: [DRM99] NGC 2403 R (Nos I-VI). Table 2: [DRM99] NGC 2403 R-NN N=50. Fig.6: [DRM99] NGC 2403 I A (Nos A-D). Fig.8: [DRM99] NGC 2403 I EMN (Nos EM1-EM5). Fig.16b: [DRM99] NGC 2403 IV A (No. A). Table 4: [DRM99] 4-NN (Nos 4-1 to 4-52). Table 5: [DRM99] 5-NN (Nos 5-1 to 5-25).

Simbad objects: 164

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Number of rows : 164
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 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 547 0
3 HD 5980 WR* 00 59 26.5838833944 -72 09 53.927337312   11.13 11.31   11.029 WN4+O7I: 419 1
4 NGC 588 HII 01 32 45.2 +30 38 54 14.59 14.40 14.44 14.89 15.16 ~ 126 1
5 NGC 595 HII 01 33 33.53 +30 41 29.8           ~ 213 0
6 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
7 NGC 604 HII 01 34 32.1 +30 47 01           ~ 608 0
8 NAME NGC 1569 CL* A Cl* 04 30 48.2 +64 50 59   15.45 15.22     ~ 106 1
9 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
10 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 692 1
11 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
12 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
13 NGC 2363 AG? 07 28 29.59 +69 11 34.3   15.5       ~ 262 1
14 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 588 3
15 [DRM99] 5-25 ? 07 36 04.8 +65 37 11   21.4 21.0     ~ 1 0
16 HK NGC 2403 542 HII 07 36 19.9 +65 37 07           ~ 15 0
17 [DRM99] 5-1 G 07 36 29.4 +65 37 18   19.7 18.9     ~ 1 0
18 [DRM99] 5-2 G 07 36 32.6 +65 37 09   20.7 20.0     ~ 1 0
19 [DRM99] 5-3 G 07 36 32.6 +65 37 23   21.4 20.6     ~ 1 0
20 [DRM99] 4-1 * 07 36 33.24 +65 36 56.3     20.79     ~ 1 0
21 [DRM99] 4-2 * 07 36 33.35 +65 36 56.1     20.58     ~ 1 0
22 [DRM99] 5-4 Cl* 07 36 35.4 +65 36 29   20.7 20.4     ~ 1 0
23 [DRM99] 4-3 * 07 36 35.54 +65 36 04.8     23.71     ~ 1 0
24 [DRM99] 5-5 Cl* 07 36 35.9 +65 35 58   21.2 20.9     ~ 1 0
25 [DRM99] 4-4 * 07 36 37.06 +65 36 34.2     22.58     ~ 1 0
26 [DRM99] 4-5 * 07 36 37.36 +65 36 45.1     24.25     ~ 1 0
27 [DRM99] 4-6 * 07 36 37.85 +65 36 32.9     22.29     ~ 1 0
28 [DRM99] 4-7 * 07 36 37.87 +65 36 34.2     22.13     ~ 1 0
29 [DRM99] 4-9 * 07 36 37.91 +65 37 02.0     22.33     ~ 1 0
30 [DRM99] 5-6 ? 07 36 38.0 +65 37 09   19.4 19.3     ~ 1 0
31 [DRM99] 4-8 * 07 36 38.06 +65 36 33.5     18.89     ~ 1 0
32 [DRM99] 4-10 * 07 36 38.19 +65 36 33.8     21.70     ~ 1 0
33 [DRM99] 5-7 G 07 36 38.2 +65 37 28   20.7 20.0     ~ 1 0
34 [DRM99] 5-8 G 07 36 38.6 +65 38 10   19.8 19.1     ~ 1 0
35 [DRM99] 4-11 * 07 36 38.72 +65 37 36.9     24.14     ~ 1 0
36 [DRM99] 4-12 * 07 36 38.75 +65 38 03.3     24.12     ~ 1 0
37 [DRM99] 4-14 * 07 36 40.15 +65 37 05.4     20.82     ~ 1 0
38 [DRM99] 4-13 * 07 36 40.18 +65 36 22.1     24.05     ~ 1 0
39 [DRM99] 4-15 * 07 36 40.20 +65 37 05.4     21.08     ~ 1 0
40 [DRM99] 4-16 * 07 36 40.24 +65 37 04.5     19.16     ~ 1 0
41 [DRM99] 4-17 * 07 36 41.08 +65 36 06.0     22.95     ~ 1 0
42 [DRM99] 4-18 * 07 36 41.79 +65 36 49.6     22.25     ~ 1 0
43 HK NGC 2403 404 HII 07 36 41.8 +65 38 05           ~ 7 0
44 [DRM99] 4-19 * 07 36 42.00 +65 36 10.8     22.53     ~ 1 0
45 [DRM99] 4-20 * 07 36 42.21 +65 36 04.7     23.64     ~ 1 0
46 [DRM99] 5-9 Gl? 07 36 44.1 +65 36 18   20.2 20.1     ~ 1 0
47 [DRM99] 5-10 Gl? 07 36 44.1 +65 37 36   20.1 20.0     ~ 1 0
48 [DRM99] 5-11 Gl? 07 36 44.2 +65 37 32   21.2 21.0     ~ 1 0
49 [DRM99] 5-12 Gl? 07 36 44.7 +65 37 36   20.1 20.1     ~ 1 0
50 CXOU J073645.6+653659 HII 07 36 45.6 +65 36 59           ~ 27 0
51 [DRM99] 4-21 * 07 36 46.10 +65 37 35.9     22.63     ~ 1 0
52 [DRM99] 5-13 Cl* 07 36 46.2 +65 37 14   21.7 20.9     ~ 1 0
53 [DRM99] 5-14 Cl* 07 36 47.2 +65 36 46   22.2 21.2     ~ 1 0
54 [DRM99] 4-22 * 07 36 48.90 +65 36 33.0           ~ 1 0
55 [DRM99] 4-23 * 07 36 48.91 +65 36 37.0     21.01     ~ 1 0
56 [DRM99] 4-24 * 07 36 48.93 +65 36 32.4           ~ 1 0
57 [DRM99] 5-15 G 07 36 49.2 +65 38 08   20.9 20.7     ~ 1 0
58 [DRM99] 4-25 * 07 36 49.26 +65 36 51.5     20.80     ~ 1 0
59 [DRM99] 4-26 * 07 36 49.44 +65 36 47.2     21.45     ~ 1 0
60 [DRM99] 4-27 * 07 36 49.49 +65 36 32.6     21.13     ~ 1 0
61 [DRM99] 4-28 * 07 36 49.88 +65 36 55.2     21.95     ~ 1 0
62 [DRM99] 4-29 * 07 36 49.88 +65 37 55.7     20.97     ~ 1 0
63 [DRM99] 5-16 Gl? 07 36 50.2 +65 37 49   19.8 19.7     ~ 1 0
64 [DRM99] 4-30 * 07 36 50.71 +65 36 48.4     18.61     ~ 1 0
65 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
66 [DRM99] 4-31 * 07 36 51.87 +65 36 56.1     22.62     ~ 1 0
67 HK NGC 2403 270 Cl* 07 36 52.13 +65 36 48.5           ~ 24 0
68 [DRM99] 4-32 * 07 36 52.1310220704 +65 36 20.934659520     20.25     ~ 1 0
69 [DRM99] 4-33 * 07 36 54.08 +65 36 16.0     21.47     ~ 1 0
70 [DRM99] 4-34 * 07 36 54.52 +65 35 45.4     20.85     ~ 1 0
71 [DRM99] 4-35 * 07 36 55.32 +65 35 48.2     22.02     ~ 1 0
72 [DRM99] 5-18 Cl* 07 36 55.6 +65 35 35   20.4 19.6     ~ 1 0
73 [DRM99] 4-36 * 07 36 56.14 +65 36 11.0     22.03     ~ 1 0
74 HK NGC 2403 221 HII 07 36 58.0 +65 37 23           ~ 8 0
75 [DRM99] 5-19 GlC 07 36 58.4 +65 35 50   19.6 19.0     ~ 1 0
76 [DRM99] 5-20 WR? 07 36 58.7587834536 +65 36 34.480189512   20.4 19.3     ~ 1 0
77 [DRM99] 5-21 Cl* 07 36 58.7901801192 +65 36 33.310812060   19.2 18.9     ~ 2 0
78 [DRM99] 4-37 * 07 36 59.29 +65 35 32.2     22.22     ~ 1 0
79 [DRM99] 5-22 GlC 07 36 59.4 +65 35 38   20.8 20.0     ~ 1 0
80 [DRM99] 4-38 * 07 36 59.96 +65 35 28.1     22.06     ~ 1 0
81 [DRM99] 4-39 * 07 37 00.74 +65 35 23.8     21.41     ~ 1 0
82 [DRM99] 4-40 * 07 37 01.17 +65 35 46.8     23.41     ~ 1 0
83 [DRM99] 4-41 * 07 37 02.89 +65 36 47.4     23.58     ~ 1 0
84 [DRM99] 5-23 GlC 07 37 03.0 +65 35 51   20.6 20.0     ~ 1 0
85 [DRM99] 4-42 * 07 37 03.11 +65 35 46.3     22.79     ~ 1 0
86 [DRM99] 5-24 G 07 37 03.2 +65 36 44   19.0 18.8     ~ 1 0
87 [DRM99] 4-43 * 07 37 03.22 +65 37 18.0     22.69     ~ 1 0
88 [DRM99] 4-44 * 07 37 03.25 +65 37 21.9     23.24     ~ 1 0
89 [DRM99] 4-45 * 07 37 03.26 +65 37 42.6     22.33     ~ 1 0
90 [DRM99] 4-46 * 07 37 03.40 +65 37 20.8     23.11     ~ 1 0
91 [DRM99] 4-47 * 07 37 03.43 +65 37 17.8     21.38     ~ 1 0
92 [DRM99] 4-48 * 07 37 03.74 +65 36 16.3     23.85     ~ 1 0
93 [DRM99] 4-49 * 07 37 04.21 +65 36 23.0     23.01     ~ 1 0
94 [DRM99] 4-50 * 07 37 04.91 +65 37 03.6     23.36     ~ 1 0
95 [DRM99] 4-51 * 07 37 05.14 +65 35 14.3     23.39     ~ 1 0
96 [DRM99] 4-52 * 07 37 05.79 +65 35 51.1     19.95     ~ 1 0
97 [S75b] NGC 2403 2 HII 07 37 06.82 +65 36 38.7           ~ 41 0
98 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
99 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
100 HD 97950 Cl* 11 15 07.346 -61 15 38.52 9.64 9.83 9.03 9.69   ~ 198 2
101 W 49 SFR 19 10 20 +09 07.7           ~ 601 1
102 [WBN74] W 51 IRS 2 SFR 19 23 39.93 +14 31 09.4           ~ 321 0
103 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
104 [DRM99] NGC 2403 II-6 * ~ ~     21.02     ~ 1 0
105 [DRM99] NGC 2403 II-5 ** ~ ~     19.61     ~ 1 0
106 [DRM99] NGC 2403 II-4 * ~ ~     22.23     ~ 1 0
107 [DRM99] NGC 2403 II-3 * ~ ~     22.48     ~ 1 0
108 [DRM99] NGC 2403 II-2 * ~ ~     20.13     ~ 1 0
109 [DRM99] NGC 2403 II-8 * ~ ~     20.61     ~ 1 0
110 [DRM99] NGC 2403 II-9 * ~ ~     23.55     ~ 1 0
111 [DRM99] NGC 2403 II-10 * ~ ~     19.15     ~ 1 0
112 [DRM99] NGC 2403 II-11 * ~ ~           ~ 1 0
113 [DRM99] NGC 2403 IV-1 * ~ ~           ~ 1 0
114 [DRM99] NGC 2403 IV-2 * ~ ~           ~ 1 0
115 [DRM99] NGC 2403 IV-3 * ~ ~           ~ 1 0
116 [DRM99] NGC 2403 IV-4 * ~ ~     24.2     ~ 1 0
117 [DRM99] NGC 2403 IV-5 * ~ ~     21.2     ~ 1 0
118 [DRM99] NGC 2403 IV-6 * ~ ~     23.0     ~ 1 0
119 [DRM99] NGC 2403 IV-7 ** ~ ~     20.8     ~ 1 0
120 [DRM99] NGC 2403 IV-8 * ~ ~     22.5     ~ 1 0
121 [DRM99] NGC 2403 IV-9 * ~ ~     22.3     ~ 1 0
122 [DRM99] NGC 2403 V-1 * ~ ~     20.8     ~ 1 0
123 [DRM99] NGC 2403 V-2 * ~ ~     22.5     ~ 1 0
124 [DRM99] NGC 2403 II-1 * ~ ~     20.94     ~ 1 0
125 [DRM99] NGC 2403 I-22 * ~ ~     22.9     ~ 1 0
126 [DRM99] NGC 2403 I-21 * ~ ~     21.1     ~ 1 0
127 [DRM99] NGC 2403 I-20 * ~ ~     22.3     ~ 1 0
128 [DRM99] NGC 2403 I-19 * ~ ~     22.5     ~ 1 0
129 [DRM99] NGC 2403 I-18 * ~ ~     24.0     ~ 1 0
130 [DRM99] NGC 2403 I-17 * ~ ~     23.6     ~ 1 0
131 [DRM99] NGC 2403 I-16 ** ~ ~     21.8     ~ 1 0
132 [DRM99] NGC 2403 I-15 * ~ ~     23.9     ~ 1 0
133 [DRM99] NGC 2403 I-14 * ~ ~     23.3     ~ 1 0
134 [DRM99] NGC 2403 I-13 * ~ ~     22.4     ~ 1 0
135 [DRM99] NGC 2403 I-12 * ~ ~     20.1     ~ 1 0
136 [DRM99] NGC 2403 I-11 * ~ ~     23.8     ~ 1 0
137 [DRM99] NGC 2403 I-10 * ~ ~     23.4     ~ 1 0
138 [DRM99] NGC 2403 I-9 * ~ ~     23.1     ~ 1 0
139 [DRM99] NGC 2403 I-8 * ~ ~     22.2     ~ 1 0
140 [DRM99] NGC 2403 I-7 * ~ ~     23.6     ~ 1 0
141 [DRM99] NGC 2403 I-6 * ~ ~     23.0     ~ 1 0
142 [DRM99] NGC 2403 I-5 * ~ ~     22.3     ~ 1 0
143 [DRM99] NGC 2403 I-4 * ~ ~     23.6     ~ 2 0
144 [DRM99] NGC 2403 V-3 ** ~ ~     21.3     ~ 1 0
145 [DRM99] NGC 2403 V-4 * ~ ~           ~ 1 0
146 [DRM99] NGC 2403 V-5 * ~ ~     23.2     ~ 1 0
147 [DRM99] NGC 2403 I-3 * ~ ~           ~ 1 0
148 [DRM99] NGC 2403 V-6 * ~ ~     23.6     ~ 1 0
149 [DRM99] NGC 2403 I-2 * ~ ~     21.4     ~ 2 0
150 [DRM99] NGC 2403 I-1 * ~ ~           ~ 1 0
151 [DRM99] NGC 2403 IV A Cl* ~ ~           ~ 1 0
152 [DRM99] NGC 2403 I EM5 Em* ~ ~           ~ 1 0
153 [DRM99] NGC 2403 VI-1 * ~ ~           ~ 1 0
154 [DRM99] NGC 2403 I EM4 Em* ~ ~           ~ 1 0
155 [DRM99] NGC 2403 I EM3 Em* ~ ~           ~ 1 0
156 [DRM99] NGC 2403 I EM2 Em* ~ ~           ~ 1 0
157 [DRM99] NGC 2403 VI-2 * ~ ~     21.3     ~ 1 0
158 [DRM99] NGC 2403 I EM1 Em* ~ ~           ~ 1 0
159 [DRM99] NGC 2403 I D Cl* ~ ~           ~ 1 0
160 [DRM99] NGC 2403 I C Cl* ~ ~           ~ 4 0
161 [DRM99] NGC 2403 I B Cl* ~ ~           ~ 4 0
162 [DRM99] NGC 2403 I A Cl* ~ ~           ~ 4 0
163 [DRM99] NGC 2403 II-7 * ~ ~     22.45     ~ 1 0
164 NAME Local Group GrG ~ ~           ~ 9325 0

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