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 …

Deep groundbased spectra of Hubble V and Hubble X, the two largest and brightest H ii
regions in the Local Group dwarf galaxy, NGC 6822, are presented. The extinction …

We present abundances of neon, nitrogen and oxygen of some nearby dwarf irregular
galaxies. The elemental abundances are retrieved from long-slit spectroscopy of H ii regions …

We present H α imaging and optical spectrophotometry of H II regions in the low surface
brightness dwarf irregular galaxy DDO 154. The galaxy possesses a very small population …

The spectral characteristics throughout the dwarf irregular galaxy DDO 53 are studied. The
results are very similar to those for other irregular galaxies: high excitation and low values of …

Abstract Using the Cerro Tololo Inter-American Observatory 4 m telescope, we have
obtained optical spectra of H II regions in five Sculptor group dwarf irregular galaxies. We …

Chemical abundances in three M supergiants in the Local Group dwarf irregular galaxy IC
1613 have been determined using high-resolution spectra obtained with the UVES …

On the Evolution of Helium Nitrogen and Oxygen Abundances in Dwarf Irregular Gal ADS
Classic is now deprecated. It will be completely retired in October 2019. This page will …

A detailed analysis of the physical conditions of the Interstellar Medium in the main body of
the Local Group dwarf irregular galaxy IC 10 is carried out using long-slit spectroscopy …

We present long-slit optical spectroscopy of 67 H II regions in 21 dwarf irregular galaxies to
investigate the enrichment of oxygen, nitrogen, neon, sulfur, and argon in low-mass …