Spectroscopic observations of a sample of dwarf spiral galaxies. II- Abundance gradients

Details Spectroscopic observations of a sample of dwarf spiral galaxies. II- Abundance gradients Spectroscopic observations of a sample of dwarf spiral galaxies. II- Abundance gradients

2010-11-03

arxiv.org/abs/1011.1013v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

26 pages, 10 figures, resubmitted to AJ on August 28th after minor referee suggestions

Scientific paper

The oxygen gradient of four dS galaxies has been determined using abundances for several HII regions determined with four different methods. The gradient slopes of the three non-barred galaxies in the sample are quite steep, larger than -0.2 dex/kpc, while the gradient of the barred galaxy is shallower, only -0.1 dex/kpc. Although these gradients are quite steep they are real, following all the galaxies the same trend. Moreover, the results obtained here agree with those marked by the late-type, non-dwarf spirals, particularly the relationship between the gradient and the absolute magnitude and the optical size for non-barred galaxies, and the surface density for barred ones.

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