Abundance gradients in galaxies in the Sculptor and Centaurus groups

Details Abundance gradients in galaxies in the Sculptor and Centaurus groups Abundance gradients in galaxies in the Sculptor and Centaurus groups

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204..743w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, Aug. 1983, p. 743-763.

Mathematics

Logic

102

Abundance, Cosmochemistry, Galactic Evolution, Interstellar Gas, H Ii Regions, Oxygen, Spectrophotometry

Scientific paper

About 80 H II regions have been observed spectrophotometrically over the faces of the Sculptor galaxies NGC 55, 253, 300 and 7793 and the Centaurus galaxies M83 and NGC 5253. Radial gradients in the O/H ratio have been measured. NGC 55 has a zero gradient, a mean oxygen abundance identical to that of its morphological counterpart, the LMC, but a low nitrogen-to-oxygen ratio. The hotspots in NGC 5253 have the low abundance appropriate to the absolute magnitude and mass of the underlying elliptical. The other spirals have marked gradients with a considerable range in mean abundance from one spiral to another. A relation between the oxygen abundance at a characteristic radius and the surface brightness of stars at the same radius is suggested and the implication for galactic evolution is pointed out.

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