Abundances in southern Local Group dwarf irregular galaxies

Details Abundances in southern Local Group dwarf irregular galaxies Abundances in southern Local Group dwarf irregular galaxies

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..563s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Oct. 1, 1989, p. 563-572. Research supported by th

Astronomy and Astrophysics

Astronomy

103

Chemical Composition, Dwarf Galaxies, Hydrogen Clouds, Irregular Galaxies, Local Group (Astronomy), Abundance, Nitrogen, Oxygen, Spectrophotometry

Scientific paper

Optical spectrophotometry of H II regions in the southern Local Group dwarf irregular galaxies NGC 6822, WLM, and SagDIG was obtained. Oxygen abundances are deduced via direct electron temperatures for NGC 6822 and WLM and via an empirical method for all three galaxies. These galaxies conform to the luminosity-abundance relationship for irregular galaxies. Although WLM shows a relatively low abundance, it is considered to be unlikely that this is the cause of the lack of long-period Cepheid variables. It is more probable that WLM has experienced an interrupted star formation history, as is often predicted for dwarf galaxies. The relatively low value of N/O in NGC 6822 may be consistent with the 10 to the -8th-yr old burst of star formation noted by Hodge.

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