This article has an erratum: [erratum]
Volume 369, Number 3, April III 2001
|Page(s)||797 - 811|
|Section||Cosmology (including clusters of galaxies)|
|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
Astronomiska observatoriet, Box 515, 751 20 Uppsala, Sweden e-mail: firstname.lastname@example.org
2 Instituto de Astrofísica de Andalucía, CSIC, Apdo. 3004, 18080 Granada, Spain e-mail: email@example.com
Corresponding author: A. M. Hidalgo-Gámez, firstname.lastname@example.org
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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