Journal Article

A mechanism for the formation of oxygen and iron bimodal radial distribution in the disc of our Galaxy

I. A. Acharova, J. R. D. Lépine, Yu. N. Mishurov, B. M. Shustov, A. V. Tutukov and D. S. Wiebe

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 2, pages 1149-1155
Published in print February 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15964.x
A mechanism for the formation of oxygen and iron bimodal radial distribution in the disc of our Galaxy

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Recently, it has been proposed that there are two type Ia supernova progenitors: short-lived and long-lived. On the basis of this idea, we develop a theory of a unified mechanism for the formation of the bimodal radial distribution of iron and oxygen in the Galactic disc. The underlying cause for the formation of the fine structure of the radial abundance pattern is the influence of the spiral arms, specifically the combined effect of the corotation resonance and turbulent diffusion. From our modelling, we conclude that in order to explain the bimodal radial distributions simultaneously for oxygen and iron and to obtain approximately equal total iron output from different types of supernovae, the mean ejected iron mass per supernova event should be the same as quoted in the literature if the maximum mass of stars, which eject heavy elements, is 50 M. For the upper mass limit of 70 M, the production of iron by a type II supernova explosion should increase by about 1.5 times.

Keywords: Galaxy: abundances; Galaxy: structure

Journal Article.  4775 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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