2000ApJ...537..589K


Query : 2000ApJ...537..589K

2000ApJ...537..589K - Astrophys. J., 537, 589-612 (2000/July-2)

An empirical test and calibration of H II region diagnostics.

KENNICUTT R.C.Jr, BRESOLIN F., FRENCH H. and MARTIN P.

Abstract (from CDS):

We present spectrophotometry in the 3600-9700 Å region for a sample of 39 H II regions in the Galaxy and Magellanic Clouds, for which independent information is available on the spectral types and effective temperatures of the ionizing stars. The spectra have been used to evaluate nebular diagnostics of stellar temperature, metal abundance, and ionization parameter, and to compare the observed behavior of the line indices with predictions of nebular photoionization models. We observe a strong degeneracy between forbidden-line sequences produced by changes in stellar Teff and metal abundance, which severely complicates the application of many forbidden-line diagnostics to extragalactic H II regions. Our data confirm however that the Edmunds & Pagel [O II]+[O III] abundance index and the Vílchez & Pagel η' index provide more robust diagnostics of metal abundance and stellar effective temperature, respectively. A comparison of the fractional helium ionization of the H II regions with stellar temperature confirms the reliability of the spectral type versus Teff calibration for the relevant temperature range Teff≤38,000 K. We use empirical relations between the nebular hardness indices and Teff to reinvestigate the case for systematic variations in the stellar effective temperatures and the upper initial mass functions of massive stars in extragalactic H II regions. The data are consistent with a significant softening of the ionizing spectra (consistent with cooler stellar temperatures) with increasing metal abundance, especially for Z≤Z. However, unresolved degeneracies between Z and Teff still complicate the interpretation of this result.

Abstract Copyright:

Journal keyword(s): Galaxies: ISM - Galaxies: Star Clusters - ISM: H II Regions

Simbad objects: 76

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Number of rows : 76
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10361 1
2 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 464 0
3 HD 5980 WR* 00 59 26.5838833944 -72 09 53.927337312   11.13 11.31   11.029 WN4+O7I: 375 1
4 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 227 0
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5538 1
6 NGC 604 HII 01 34 32.1 +30 47 01           ~ 572 0
7 SH 2-212 HII 04 40 36.50 +50 27 44.3           ~ 94 2
8 SNR J045447-662528 SNR 04 54 48.00 -66 25 42.0           ~ 108 0
9 DEM L 34 HII 04 56 34.3 -66 26 52           ~ 101 0
10 NGC 1763 As* 04 56 51.5 -66 24 25     9.40     ~ 160 3
11 NGC 1935 As* 05 21 58 -67 57.3           ~ 106 0
12 LHA 120-N 44 EmO 05 22 06.9 -67 56 46           ~ 185 1
13 NGC 1937 As* 05 22 29 -67 53.7           ~ 44 1
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16242 1
15 LHA 120-N 138B EmO 05 24 12.4926087864 -68 30 06.343860168           ~ 8 0
16 OGLE LMC-ECL-14757 Y*O 05 24 14.00 -68 29 49.2     18.538   18.150 ~ 15 0
17 DEM L 174 HII 05 24 22 -68 31.8           ~ 14 0
18 LHA 120-N 51D HII 05 25 17.3 -67 22 47           ~ 111 0
19 KMHK 879 As* 05 25 26 -67 28.4     11.75     ~ 38 0
20 NGC 1955 As* 05 26 12 -67 29.9   8.95 8.87     ~ 64 0
21 LHA 120-N 144 HII 05 26 42.5 -68 49 34           ~ 67 0
22 LH 58 As* 05 26 45 -68 49.9   7.97 7.96     ~ 58 0
23 NGC 1931 OpC 05 31 23 +34 14.0     10.1     ~ 122 0
24 NGC 2020 EmO 05 33 10.6 -67 42 45           ~ 34 0
25 M 42 HII 05 35 17.3 -05 23 28           ~ 3935 0
26 NAME Ori A MoC 05 38 -07.1           ~ 2868 0
27 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1118 2
28 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1882 1
29 LHA 120-N 70 HII 05 43 17.5 -67 50 48           ~ 80 0
30 LH 114 As* 05 43 18 -67 51.5     11.32     ~ 35 0
31 LHA 120-N 180C EmO 05 48 15.1 -70 02 03           ~ 13 0
32 NGC 2122 As* 05 48 55 -70 04.1     10.43     ~ 91 0
33 LHA 120-N 180 HII 05 49 13 -70 06.4           ~ 33 0
34 SH 2-257 HII 06 12 44 +17 59.3           ~ 125 1
35 MMB G192.600-00.048 Y*O 06 12 54.0100 +17 59 23.200           ~ 371 0
36 IC 2162 HII 06 13 04.1 +17 58 44           ~ 349 2
37 IRAS 06121+1221 MIR 06 14 55.86048 +12 20 40.4088           ~ 41 0
38 SH 2-271 HII 06 15.2 +12 22           ~ 83 1
39 NGC 2244 OpC 06 32 11 +04 54.8           ~ 595 1
40 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 472 1
41 IC 466 HII 07 08 37 -04 18.8           ~ 46 0
42 SH 2-301 HII 07 09 54.3 -18 29 53           ~ 48 0
43 NGC 2359 HII 07 18 30.000 -13 13 36.00           ~ 163 0
44 SH 2-305 HII 07 30 04.1 -18 32 13           ~ 53 0
45 SH 2-307 HII 07 35 33 -18 45.6           ~ 60 2
46 NGC 2467 Cl* 07 52 18 -26 25.7           ~ 181 1
47 HD 64315 Em* 07 52 20.2837438416 -26 25 46.683933780 8.76 9.49 9.24 9.63 8.86 O5.5Vz+O7V 112 1
48 HD 64568 * 07 53 38.2051918848 -26 14 02.598056556 8.64 9.50 9.39 9.77 9.204 O3V((f*))z 103 0
49 DCld 264.3+01.5 DNe 08 54 42 -42 54.8           ~ 68 0
50 RCW 34 HII 08 56 28.1 -43 05 58   10.5 11.21     ~ 94 0
51 V* V391 Vel Or* 08 56 28.109952 -43 05 55.40028 12.61 12.71 11.73 11.50   O8/8.5V 81 1
52 GUM 25 HII 09 02 21.3 -48 41 55           ~ 28 0
53 NGC 3199 HII 10 16 32.8 -57 56 02           ~ 63 1
54 HD 89358 WR* 10 17 02.2743231360 -57 54 46.875258324 11.1 11.19 10.83 10.59   WN4-s 167 1
55 Cl Trumpler 14 OpC 10 43 57 -59 33.2   5.70 5.5     ~ 475 0
56 HD 93162 WR* 10 44 10.3890266112 -59 43 11.106500520 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 348 1
57 Cl Trumpler 16 OpC 10 45 01 -59 42.0   5.35 5.0     ~ 458 0
58 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 957 2
59 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2341 0
60 NGC 3603 OpC 11 15 11 -61 15.5           ~ 1022 1
61 * lam Cen * 11 35 46.8780907704 -63 01 11.405976996 2.96 3.10 3.14 3.10 3.11 B9III 127 0
62 IC 2944 HII 11 38 20.00 -63 22 22.0           ~ 178 0
63 M 8 HII 18 03 37 -24 23.2           ~ 588 1
64 M 16 OpC 18 18 45 -13 47.5   6.58 6.0     ~ 992 2
65 SH 2-49 HII 18 19.0 -13 52           ~ 32 1
66 SH 2-45 HII 18 20 21.2 -16 13 37           ~ 29 0
67 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1560 0
68 LBN 070.13+01.71 HII 20 00 54 +33 29.6   13.79 12.86     ~ 40 2
69 LBN 070.24+01.53 HII 20 01 44.7 +33 31 14           ~ 35 1
70 SH 2-148 HII 22 56 21 +58 31.5           ~ 65 0
71 SH 2-152 HII 22 58 40.8107767416 +58 46 59.226036024           ~ 136 1
72 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 169 1
73 TYC 4279-1463-1 * 23 13 34.3977427416 +61 30 14.637855024   12.76 11.66     O3.5V((f*))+O9.5V 24 0
74 NGC 7538 OpC 23 13 37 +61 30.0           ~ 853 1
75 BD+60 2522 Em* 23 20 44.5134945744 +61 11 40.530567984 8.46 9.08 8.67     O6.5(n)fp 205 1
76 NGC 7635 HII 23 20 48.3 +61 12 06           ~ 164 2

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2022.09.26-07:56:28

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