Journal Article

Breaks in the radial oxygen abundance and corotation radius of three spiral galaxies

S. Scarano, J. R. D. Lépine and M. M. Marcon-Uchida

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 412, issue 3, pages 1741-1754
Published in print April 2011 | ISSN: 0035-8711
Published online April 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.18010.x
Breaks in the radial oxygen abundance and corotation radius of three spiral galaxies

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The correlation between the breaks in the metallicity distribution and the corotation radius of spiral galaxies has been already advocated in the past and is predicted by a chemodynamical model of our Galaxy that effectively introduces the role of spiral arms in the star formation rate. In this work, we present photometric and spectroscopic observations made with the Gemini Telescope for three of the best candidates of spiral galaxies to have the corotation inside the optical disc: IC 0167, NGC 1042 and NGC 6907. We observed the most intense and well-distributed H ii regions of these galaxies, deriving reliable galactocentric distances and oxygen abundances by applying different statistical methods. From these results, we confirm the presence of variations in the gradients of metallicity of these galaxies that are possibly correlated with the corotation resonance.

Keywords: galaxies: abundances; galaxies: fundamental parameters; galaxies: ISM; galaxies: spiral; galaxies: star formation

Journal Article.  9368 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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