2001A&A...367..388H


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.13CET04:24:02

2001A&A...367..388H - Astronomy and Astrophysics, volume 367, 388-404 (2001/2-4)

The chemical abundances in a sample of dwarf irregular galaxies. I. Small scale variations within NGC 6822?

HIDALGO-GAMEZ A.M., OLOFSSON K. and MASEGOSA J.

Abstract (from CDS):

Deep groundbased spectra of Hubble V and Hubble X, the two largest and brightest Hii regions in the Local Group dwarf galaxy, NGC 6822, are presented. The extinction, excitation and ionization are studied on scales as small as 4 pc. The chemical composition of some elements within the regions as well as possible small scale variations in the abundances of helium, nitrogen, oxygen and neon over the face of the two regions are investigated. The detection of the emission lines [OI] and [ClIII] are probably related to shock-heating from gas ejected from supernova explosions and planetary nebula ejections, respectively, although the contribution to the total ionization is very small. No significant differences in chemical composition was found between Hubble V and Hubble X. However, some small scale variations in the abundances of oxygen, and possibly nitrogen and helium, over the face of both Hii regions were noted, although different physical conditions could apply within the regions, such as local fluctuations in the temperature.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: irregular - galaxies: stellar content - ISM: HII regions

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 556 2
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 983 0
3 CD-28 595 PM* 01 54 50.2704861570 -27 28 35.740415025   12.06 11.51     ~ 115 0
4 LP 995-86 PM* 03 48 22.6125635562 -39 08 37.013516494   13.61 13.15     F 87 0
5 M 42 HII 05 35 17.3 -05 23 28           ~ 3658 0
6 NAME Ori A MoC 05 38 -07.1           ~ 2615 0
7 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1026 2
8 NGC 2363 G 07 28 29.83 +69 11 32.8   15.5       ~ 244 1
9 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 536 3
10 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 687 0
11 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 670 2
12 NGC 3125 H2G 10 06 33.318 -29 56 07.32 13.03 13.45 13.00 12.50 13.4 ~ 212 1
13 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 847 1
14 LEDA 39402 H2G 12 17 17.093 -28 02 32.67   17       ~ 123 0
15 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1246 4
16 [H25] V HII 19 44 52.84 -14 43 09.8           ~ 57 0
17 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1408 0
18 KD D26 HII 19 45 05.2 -14 43 13           ~ 46 0
19 NAME Local Group GrG ~ ~           ~ 6675 0

    Equat.    Gal    SGal    Ecl

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2019.11.13-04:24:02

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