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Volume 369, Number 3, April III 2001
Page(s) 797 - 811
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20010179

A&A 369, 797-811 (2001)
DOI: 10.1051/0004-6361:20010179

The chemical abundances in a sample of dwarf irregular galaxies

II. The case of IC 4662 and ESO 245-G05
A. M. Hidalgo-Gámez1, J. Masegosa2 and K. Olofsson1

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

(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]$\lambda$4363 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

Offprint request: A. M. Hidalgo-Gámez, anamaria@astro.uu.se


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