| Issue |
A&A
Volume 369, Number 3, April III 2001
|
|
|---|---|---|
| Page(s) | 797 - 811 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20010179 | |
| Published online | 15 April 2001 | |
The chemical abundances in a sample of dwarf irregular galaxies *
II. The case of IC 4662 and ESO 245-G05
1
Astronomiska observatoriet, Box 515, 751 20 Uppsala, Sweden e-mail: kjell.olofsson@astro.uu.se
2
Instituto de Astrofísica de Andalucía, CSIC, Apdo. 3004, 18080 Granada, Spain e-mail: pepa@iaa.es
Corresponding author: A. M. Hidalgo-Gámez, anamaria@astro.uu.se
Received:
29
November
2000
Accepted:
30
January
2001
Optical spectra of H ii regions of two dwarf irregular galaxies are presented. The objects are IC 4662 and ESO 245-G05. Chemical abundances were derived in all the H ii regions where the forbidden oxygen line [OIII]λ4363 Åwas detected. For spectra with the highest quality, a study of the spatial distribution of chemical elements in these objects were made. Generally, the chemical composition is largely constant within the H ii regions studied. Some differences are found but could be attributed varying physical properties, e.g. small scale fluctuations in the temperature of the region. A comparison of the chemical abundances between different H ii regions within the galaxies is made for IC 4662 and ESO 245-G05, where one of the H ii regions clearly shows deviating chemical abundances.
Key words: galaxies: evolution / galaxies: irregular / galaxies: stellar content / interstellar medium: H ii regions: general / galaxies: individual: IC 4662, ESO 245-G05
© ESO, 2001
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