Spin-down and reduced mass loss in early-type stars with large-scale magnetic fields

Z. Keszthelyi, A. De Koter, Y. Götberg, G. Meynet, S. A. Brands, V. Petit, M. Carrington, A. David-Uraz, S. T. Geen, C. Georgy, R. Hirschi, J. Puls, K. J. Ramalatswa, M. E. Shultz, A. Ud-Doula

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)257-262
Number of pages6
JournalProceedings of the International Astronomical Union
Volume17
DOIs
StatePublished - Aug 16 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this