Volume 374, Number 2, August I 2001
|Page(s)||412 - 420|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 August 2001|
Oxygen abundances in dwarf irregular galaxies and the metallicity-luminosity relationship
Main Astronomical Observatory of National Academy of Sciences of Ukraine, Goloseevo, 03680 Kiev-127, Ukraine
Accepted: 2 May 2001
The low-luminosity dwarf irregular galaxies are considered. The oxygen abundances in H ii regions of dwarf irregular galaxies were recalculated from published spectra through the recently suggested P-method. It has been found that the metallicity of low-luminosity dwarf irregular galaxies, with a few exceptions, correlates well with galaxy luminosity. The dispersion of oxygen abundances around the metallicity-luminosity relationship increases with decreasing galaxy luminosity, as was found by Richer & McCall (1995). The absence of a relationship between the oxygen abundance and the absolute magnitude in the blue band for irregular galaxies obtained by Hidalgo-Gámez & Olofsson (1998) can be explained by the large uncertainties in the oxygen abundances derived through the Te-method, that in turn can be explained by the large uncertainties in the measurements of the strengths of the weak oxygen line used in the Te-method.
Key words: galaxies: abundances / galaxies: ISM / galaxies: irregular / galaxies: individual: NGC 6822
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.