Journal Article

Modelling the composition of a young star cluster ejecta

Mercedes Mollá and Roberto Terlevich

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 3, pages 1696-1708
Published in print September 2012 | ISSN: 0035-8711
Published online September 2012 | e-ISSN: 1365-2966 | DOI:
Modelling the composition of a young star cluster ejecta

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We have computed with a fine time grid the evolution of the elemental abundances of He, C, N and O ejected by young (t < 20 Myr) and massive (M = 106 M) coeval stellar cluster with a Salpeter initial mass function (IMF) over a wide range of initial abundances. Our computations incorporate the mass loss from massive stars (M ≥ 30 M) during their wind phase including the Wolf–Rayet phase and the ejecta from the core-collapse supernovae. We find that during the Wolf–Rayet phase (t < 5 Myr) the cluster ejecta composition suddenly becomes vastly overabundant in N for all initial abundances and in He, C and O for initial abundances higher than one-fifth of the solar. The C and O abundances in the cluster ejecta can reach over 50 times the solar value with important consequences for the chemical and hydrodynamical evolution of the surrounding interstellar medium.

Keywords: stars: abundances; stars: mass-loss; supernovae: general; stars: Wolf–Rayet; galaxies: abundances; galaxies: star clusters: general

Journal Article.  6230 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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