2000MNRAS.311..329D

Query : 2000MNRAS.311..329D

2000MNRAS.311..329D - Mon. Not. R. Astron. Soc., 311, 329-345 (2000/January-2)

Oxygen and helium abundances in Galactic HII regions - II. Abundance gradients.

DEHARVENG L., PENA M., CAPLAN J. and COSTERO R.

Abstract (from CDS):

The absolute integrated fluxes that we obtained (Paper I) for 34 Hii regions, with Galactocentric distances RG in the 6.6-17.7kpc range, in the emission lines [Oii] λλ3726 and 3729, [Oiii] λλ4363 and 5007, Hei λ5876, Hα and Hβ, are analysed to derive the extinctions, the electron densities and temperatures, the ionic abundances O+/H+, O++/H+ and He+/H+ and the O/H abundances.

The electron temperature has been derived from the [Oiii] λ4363/λ5007 ratio in six Hii regions with RG between 6.6 and 14.8kpc. These new measurements of Te, which are in good agreement with those from radio recombination lines, widen the RG range for which reliable Te measurements exist. Combining our new Te([Oiii]) results with the radio values, we obtain the following temperature relationship: Te K]=(372±38)RG+4260±350.

The O+/H+ and O++/H+ abundances have been obtained assuming a two-temperature Hii region model. Our O/H relationship for 5kpc<RG<15kpc is 12+logO/H= (-3.95±0.49)x10–2RG+(8.82±0.05). The slope is lower, by a factor of 2, than that previously obtained by Shaver et al. No significant flattening of this relation is obtained out to 15kpc. At the solar Galactocentric distance, 12+log(O/H)=8.48, in good agreement with the O/H abundance measured in the local interstellar medium by Meyer et al., and a factor of 2 lower than the solar abundance.

Our helium observations show that even a region ionized by a star earlier than O6.5 may contain a significant amount of neutral helium. We confirm the high ΔY/Δ(O/H) value (≥180) measured in the Galaxy by Peimbert et al.


Abstract Copyright: 2000, Royal Astronomical Society

Journal keyword(s): ISM: abundances - Hii regions - Galaxy: abundances

Simbad objects: 78

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Number of rows : 78
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 281 HII 00 52 25.1 +56 33 54           ~ 243 1
2 IC 1590 OpC 00 52 49 +56 37.7           ~ 65 0
3 HD 5005 ** 00 52 49.21342 +56 37 39.5227 7.02         ~ 144 0
4 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5839 1
5 HD 13744 * 02 15 58.6970437416 +58 17 37.025669076 8.51 8.27 7.64     B9Iab 70 0
6 NGC 1491 HII 04 03 15.9 +51 18 54           ~ 113 1
7 SH 2-209 HII 04 11 06.7 +51 09 44           ~ 97 0
8 Cl Waterloo 1 OpC 04 18 43.7 +52 51 47           ~ 73 0
9 LBN 151.25+02.12 HII 04 19 44.5 +53 08 50           ~ 64 2
10 LBN 154.69+02.43 HII 04 36 57 +50 52.6           ~ 41 0
11 SH 2-212 HII 04 40 37.8 +50 27 40           ~ 99 2
12 LBN 159.33+02.55 HII 04 56 05.5 +47 22 33           ~ 70 0
13 LBN 159.17+03.33 HII 04 58 45.70 +47 59 36.0           ~ 82 2
14 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1405 1
15 M 42 HII 05 35 17 -05 23.4           ~ 4077 0
16 * tet02 Ori A SB* 05 35 22.9012398264 -05 24 57.832632108 5.37 6.30 6.39 6.30 6.35 O9.5IVp 544 0
17 NAME Ori A MoC 05 38 -07.1           ~ 3012 0
18 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 703 1
19 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1377 0
20 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1154 1
21 [SMN83] S252 1 PoC 06 09 37.7 +20 29 54           ~ 3 0
22 NGC 2175 OpC 06 09 39 +20 29.2   7.0 6.8     ~ 262 3
23 SH 2-257 HII 06 12 43.57 +17 59 33.1           ~ 130 1
24 EM* MWC 137 Ae* 06 18 45.5220873216 +15 16 52.244494608 12.89 13.30 13.759 11.67 10.31 sgB[e]d 245 1
25 [SMN83] Rosette 1 PoC 06 33 45.3 +04 49 47           ~ 3 0
26 GAL 201.6+01.6 HII 06 36 36.3 +10 46 30           ~ 27 0
27 SH 2-283 HII 06 38 29 +00 42.3           ~ 46 0
28 LBN 211.65-01.51 HII 06 45 28 +00 17.8           ~ 67 0
29 SH 2-301 HII 07 09 54.3 -18 29 53           ~ 50 0
30 [SMN83] RCW 5 2 PoC 07 18 29.6 -13 15 21           ~ 2 0
31 NGC 2359 HII 07 18 30.000 -13 13 36.00           ~ 167 0
32 [SMN83] RCW 5 1 PoC 07 18 30.3 -13 15 33           ~ 3 0
33 SH 2-305 HII 07 30 04.1 -18 32 13           ~ 54 0
34 SH 2-299 HII 07 30 35.9 -15 17 59           ~ 19 0
35 NGC 2467 OpC 07 52 18 -26 25.7           ~ 186 1
36 [SMN83] RCW 16 1 PoC 07 52 19.6 -26 26 46           ~ 3 0
37 GUM 10 HII 08 16 16.8 -35 37 58           ~ 32 0
38 DCld 264.3+01.5 DNe 08 54 42 -42 54.8           ~ 68 0
39 RCW 34 HII 08 56 28.1 -43 05 58   10.5 11.21     ~ 96 0
40 V* V391 Vel Or* 08 56 28.109952 -43 05 55.40028 12.61 12.71 11.73 11.50   O8/8.5V 82 1
41 GUM 25 HII 09 02 21.3 -48 41 55           ~ 28 0
42 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4450 3
43 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1014 2
44 [SMN83] Lam Cen 1 PoC 11 38 57.4 -63 28 26           ~ 3 0
45 NAME lam Cen 2 HII 11 40 10.7 -63 25 51           ~ 5 0
46 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2916 2
47 M 8 OpC 18 03 37 -24 23.2           ~ 614 1
48 NGC 6572 PN 18 12 06.3181909152 +06 51 13.027935240   9.3 10.8     [WC] 753 0
49 [SMN83] NGC 6604 1 PoC 18 17 40 -11 53.9           ~ 3 0
50 LBN 018.45+01.87 HII 18 17 52.5 -11 40 58           ~ 57 1
51 [SMN83] NGC 6604 3 PoC 18 17 54 -11 44.4           ~ 2 0
52 M 16 OpC 18 18 45.1 -13 47 31           ~ 1029 1
53 SH 2-49 HII 18 19.0 -13 52           ~ 32 1
54 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1615 0
55 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 531 0
56 W 51 SNR 19 23 50 +14 06.0           ~ 1278 1
57 SH 2-83 HII 19 24 30 +20 47.6           ~ 29 0
58 LBN 061.50+00.29 HII 19 46 45.7 +25 12 56           ~ 67 0
59 SH 2-88 B HII 19 46 48.2 +25 12 21           ~ 158 2
60 LBN 064.20-00.44 HII 19 55 02 +27 12.8   15.04 13.64     ~ 30 0
61 LBN 071.58+02.86 HII 19 59 55 +35 16.6           ~ 35 0
62 LBN 070.24+01.53 HII 20 01 44.7 +33 31 14           ~ 39 1
63 SH 2-104 HII 20 17 52.5 +36 49 24           ~ 97 0
64 SH 2-112 HII 20 33 49 +45 38.0           ~ 33 0
65 NGC 7000 Cl* 20 58 47 +44 19.8           ~ 400 0
66 NGC 7009 PN 21 04 10.8155187648 -11 21 48.580157556   12.48 12.07     ~ 996 1
67 LBN 096.23+02.55 HII 21 28 42 +54 37.0           ~ 52 0
68 SH 2-128 HII 21 32 09.9 +55 52 53           ~ 169 1
69 SH 2-131 HII 21 37 07 +57 30.9           ~ 48 1
70 SH 2-138 HII 22 32 45.7 +58 28 20           ~ 112 2
71 SH 2-142 HII 22 47 32 +58 02.9           ~ 94 1
72 BG 2247+59 LP? 22 49 29.0034646608 +59 54 56.182749876           ~ 107 1
73 SH 2-149 HII 22 56 16.90 +58 31 22.8           ~ 60 1
74 SH 2-148 HII 22 56 18.0 +58 31 00           ~ 67 0
75 LBN 108.78-01.01 HII 22 58 37 +58 46.8           ~ 55 0
76 SH 2-152 HII 22 58 40.8107767416 +58 46 59.226036024           ~ 139 1
77 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 174 2
78 LBN 115.71-01.61 HII 23 52 56.5 +60 29 04           ~ 40 0

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