2003A&A...397..487P


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET09:44:25

2003A&A...397..487P - Astronomy and Astrophysics, volume 397, 487-501 (2003/1-2)

On the origin of nitrogen.

PILYUGIN L.S., THUAN T.X. and VILCHEZ J.M.

Abstract (from CDS):

The problem of the origin of nitrogen is considered within the framework of an empirical approach. The oxygen abundances and nitrogen to oxygen abundances ratios are derived in HII regions of a number of spiral galaxies through the recently suggested P-method using more than six hundred published spectra. The N/O-O/H diagram for HII regions in irregular and spiral galaxies is constructed. It is found that the N/O values in HII regions of spiral galaxies of early morphological types are higher than those in HII regions with the same metallicity in spiral galaxies of late morphological types. This suggests a long-time-delayed contribution to the nitrogen production. The N/O ratio of a galaxy can then be used as an indicator of the time that has elapsed since the bulk of star formation occurred, or in other words of the nominal ``age'' of the galaxy as suggested by Edmunds & Pagel more than twenty years ago. The scatter in N/O values at a given O/H can be naturally explained by differences in star formation histories in galaxies. While low-metallicity dwarf galaxies with low N/O do not contain an appreciable amount of old stars, low-metallicity dwarf galaxies with an appreciable fraction of old stars have high N/O. Consideration of planetary nebulae in the Small Magellanic Cloud and in the Milky Way Galaxy suggests that the contribution of low-mass stars to the nitrogen production is significant, confirming the conclusion that there is a long-time-delayed contribution to the nitrogen production.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: ISM - galaxies: spiral - galaxies: irregular

Simbad objects: 54

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Number of rows : 54

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11202 1
2 NGC 248 Cl* 00 45 24.07 -73 22 44.4           ~ 46 0
3 NGC 249 HII 00 45 30.2 -73 04 47           ~ 33 0
4 NGC 261 HII 00 46 31.5 -73 06 16           ~ 61 1
5 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2998 2
6 NGC 267 HII 00 48 02.6 -73 16 39           ~ 51 0
7 LHA 115-N 25 Cl* 00 48 09.12 -73 14 19.1           ~ 37 1
8 LIN 106 Em* 00 48 09.2551884497 -73 14 15.992346701   13.93 13.75 14.70 14.47 O8V 32 0
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9698 1
10 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1349 2
11 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 452 0
12 HD 7113 Em* 01 09 13.066 -73 11 38.92     11.7     ~ 117 0
13 NGC 456 HII 01 13 44.4 -73 17 26           ~ 115 0
14 LIN 500 Em* 01 13 50.896 -73 18 01.03   13.36 12.5 13.78 14.62 ~ 62 0
15 LHA 115-N 83C SNR 01 14 00.0 -73 17 08           ~ 68 0
16 LHA 115-N 88 HII 01 24 08.1 -73 09 04           ~ 68 1
17 LHA 115-N 90 HII 01 29 30.15 -73 33 10.5           ~ 57 1
18 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5247 1
19 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1456 1
20 NGC 753 GiG 01 57 42.2042404499 +35 54 57.713274642   12.6   11.59   ~ 191 1
21 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 711 1
22 NGC 1058 Sy2 02 43 30.0247243235 +37 20 28.807743477   12.29 11.75 10.85   ~ 442 0
23 NGC 1232 EmG 03 09 45.514 -20 34 45.48   10.67 9.87 9.53 10.2 ~ 269 0
24 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1561 2
25 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1404 1
26 NGC 1637 AGN 04 41 28.229 -02 51 28.94   11.4   11.0 11.3 ~ 380 0
27 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1637 1
28 NGC 2805 GiP 09 20 20.3890361599 +64 06 10.699751669   11.9       ~ 194 1
29 NGC 2841 LIN 09 22 02.655 +50 58 35.32 10.43 10.09 9.22     ~ 1001 1
30 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 1007 3
31 NGC 2997 GiG 09 45 38.7537949543 -31 11 27.357027761   9.97 9.41 8.84 9.9 ~ 385 0
32 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4042 5
33 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 644 0
34 M 95 GiP 10 43 57.733 +11 42 13.00 10.71 10.51 9.73 9.48   ~ 964 2
35 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 788 2
36 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2170 3
37 M 61 Sy2 12 21 54.9275149050 +04 28 25.588335799 10.07 10.18 9.65     ~ 892 2
38 M 100 AGN 12 22 54.9318850854 +15 49 20.294302163 10.04 10.05 9.35     ~ 1682 2
39 NGC 4395 Sy2 12 25 48.8639154223 +33 32 48.694684028 10.84 10.54 10.11 9.98   ~ 1026 1
40 M 88 Sy2 12 31 59.216 +14 25 13.48   14.33 13.18     ~ 742 1
41 NGC 4651 LIN 12 43 42.627 +16 23 36.23   11.30 10.92 10.42 9.84 ~ 471 0
42 NGC 4654 GiP 12 43 56.638 +13 07 34.86   11.8       ~ 510 1
43 NGC 4689 H2G 12 47 45.5568267764 +13 45 46.148221803   12.8       ~ 341 0
44 NGC 4713 GiG 12 49 57.8808487310 +05 18 40.927534284   12.3       ~ 277 0
45 M 94 SyG 12 50 53.148 +41 07 12.55 9.15 8.96 8.24 7.78   ~ 1247 3
46 NGC 4751 GiG 12 52 50.7516434776 -42 39 35.527368930   12.99   11.26   ~ 69 0
47 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1089 2
48 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3888 4
49 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2277 2
50 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2600 2
51 NGC 6384 G 17 32 24.302 +07 03 36.97   13.2       ~ 291 0
52 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2291 2
53 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1128 2
54 NGC 7793 GiG 23 57 49.7533807411 -32 35 27.708304655 10.26 9.74 9.28 9.06 9.7 ~ 955 2

    Equat.    Gal    SGal    Ecl

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2021.03.01-09:44:25

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