Journal Article

Stellar evolution of massive stars with a radiative α–Ω dynamo

Adrian T. Potter, Shashikumar M. Chitre and Christopher A. Tout

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 3, pages 2358-2370
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI:
Stellar evolution of massive stars with a radiative α–Ω dynamo

More Like This

Show all results sharing this subject:

  • Astronomy and Astrophysics


Show Summary Details



Models of rotationally driven dynamos in stellar radiative zones have suggested that magnetohydrodynamic transport of angular momentum and chemical composition can dominate over the otherwise purely hydrodynamic processes. A proper consideration of the interaction between rotation and magnetic fields is therefore essential. Previous studies have focused on a magnetic model where the magnetic field strength is derived as a function of the stellar structure and angular momentum distribution. We have adapted our one-dimensional stellar rotation code, rose, to model the poloidal and toroidal magnetic field strengths with a pair of time-dependent advection–diffusion equations coupled to the equations for the evolution of the angular momentum distribution and stellar structure. This produces a much more complete, though still reasonably simple, model for the magnetic field evolution. Our model reproduces well observed surface nitrogen enrichment of massive stars in the Large Magellanic Cloud (LMC). In particular it reproduces a population of slowly rotating nitrogen-enriched stars that cannot be explained by rotational mixing alone alongside the traditional rotationlly enriched stars. The model further predicts a strong mass-dependency for the dynamo-driven field. Above a threshold mass, the strength of the magnetic dynamo decreases abruptly and so we predict that more massive stars are much less likely to support a dynamo-driven field than less massive stars.

Keywords: stars: abundances; stars: chemically peculiar; stars: evolution; stars: general; stars: magnetic field; stars: rotation

Journal Article.  10700 words.  Illustrated.

Subjects: Astronomy and Astrophysics

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.