2001A&A...374..412P

Query : 2001A&A...374..412P

2001A&A...374..412P - Astronomy and Astrophysics, volume 374412-420 (2001/8-1)

Oxygen abundances in dwarf irregular galaxies and the metallicity-luminosity relationship.

PILYUGIN L.S.

Abstract (from CDS):

The low-luminosity dwarf irregular galaxies are considered. The oxygen abundances in Hii regions of dwarf irregular galaxies were recalculated from published spectra through the recently suggested P-method. It has been found that the metallicity of low-luminosity dwarf irregular galaxies, with a few exceptions, correlates well with galaxy luminosity. The dispersion of oxygen abundances around the metallicity-luminosity relationship increases with decreasing galaxy luminosity, as was found by Richer & McCall (1995ApJ...445..642R). The absence of a relationship between the oxygen abundance and the absolute magnitude in the blue band for irregular galaxies obtained by Hidalgo-Gamez & Olofsson (1998A&A...334...45H) can be explained by the large uncertainties in the oxygen abundances derived through the Te-method, that in turn can be explained by the large uncertainties in the measurements of the strengths of the weak oxygen line [OIII] λ4363 used in the Te-method.

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Journal keyword(s): galaxies: abundances - galaxies: ISM - galaxies: irregular - galaxies: individual: NGC 6822

Simbad objects: 32

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Number of rows : 32
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 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
2 MCG-07-04-032 AG? 01 45 03.74 -43 35 52.9 13.45 12.92 12.63 12.51 12.8 ~ 152 1
3 Z 87-30 G 07 41 56.3059298112 +16 48 07.451632188   15.4       ~ 233 0
4 Z 311-8 GiG 08 34 07.20 +66 10 54.0 15.39 15.03 14.70 14.49   ~ 357 2
5 Z 331-51 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 316 0
6 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
7 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
8 Z 333-17 LSB 10 05 30.45024 +70 21 51.4253 15.95 15.56 15.09 14.87   ~ 214 1
9 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
10 NAME Arp's Galaxy AG? 11 19 34.344 +51 30 12.17   17.3       ~ 78 0
11 Z 351-62 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 346 1
12 Z 242-46 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 242 1
13 RMB 132 bCG 12 30 48.6089418912 +12 02 42.805457196     16.78   16.44 ~ 102 0
14 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 242 0
15 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
16 MCG+08-24-090 AG? 13 13 22.839 +46 19 21.71   17       ~ 135 1
17 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
18 Z 247-26 AG? 14 24 43.21 +44 31 41.8 14.24 13.54 13.17 13.07   ~ 217 0
19 [HMM90] A2 HII 17 46 59 -64 38.7           ~ 14 0
20 [HMM90] A1 HII 17 46 59 -64 38.7           ~ 14 0
21 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 253 4
22 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
23 [H77] HII 2 HII 19 44 31.79 -14 41 57.0   15       ~ 34 0
24 KD D2 ISM 19 44 32.1 -14 44 42           ~ 16 0
25 MCG-02-50-003 HII 19 44 34.38 -14 42 20.3           ~ 36 0
26 KD D7 HII 19 44 38.0 -14 51 09           ~ 12 0
27 KD D10 HII 19 44 48.4 -14 44 18           ~ 13 0
28 [H25] V HII 19 44 52.84 -14 43 09.8           ~ 69 0
29 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
30 KD D26 HII 19 45 05.2 -14 43 13           ~ 55 0
31 IC 5152 rG 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 273 1
32 NAME Kinman Dwarf bCG 22 30 36.7959714600 -00 06 36.924915456 16.85 17.35 16.87   16.65 ~ 67 2

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