Spin-down and reduced mass loss in early-type stars with large-scale magnetic fields
Abstract
Magnetism can greatly impact the evolution of stars. In some stars with OBA spectral types there is direct evidence via the Zeeman effect for stable, large-scale magnetospheres, which lead to the spin-down of the stellar surface and reduced mass loss. So far, a comprehensive grid of stellar structure and evolution models accounting for these effects was lacking. For this reason, we computed and studied models with two magnetic braking and two chemical mixing schemes in three metallicity environments with the MESA software instrument. We find notable differences between the subgrids, which affects the model predictions and thus the detailed characterisation of stars. We are able to quantify the impact of magnetic fields in terms of preventing quasi-chemically homogeneous evolution and producing slowly-rotating, nitrogen-enriched ("Group 2") stars. Our model grid is fully open access and open source.
Keywords
Cite
@article{arxiv.2211.07060,
title = {Spin-down and reduced mass loss in early-type stars with large-scale magnetic fields},
author = {Z. Keszthelyi and A. de Koter and Y. Götberg and G. Meynet and S. A. Brands and V. Petit and M. Carrington and A. David-Uraz and S. T. Geen and C. Georgy and R. Hirschi and J. Puls and K. J. Ramalatswa and M. E. Shultz and A. ud-Doula},
journal= {arXiv preprint arXiv:2211.07060},
year = {2022}
}
Comments
to appear in "Winds of Stars and Exoplanets" Proceedings IAUS 370, 2022, eds.: A.A. Vidotto, L. Fossati, J.S. Vink