Activities per year
Betelgeuse is an example of a cool super-giant displaying brightness fluctuations and irregular surface structures. Simulations by Freytag et al. (2002) of the convective envelope of the star have shown that the fluctuations in the star's luminosity may be caused by giant cell convection. A related question regarding the nature of Betelgeuse and supergiants in general is whether these stars may be magnetically active. If so, that may in turn also contribute to their variability. By performing detailed numerical simulations, I find that both linear kinematic and non-linear dynamo action are possible and that the non-linear magnetic field saturates at a value somewhat below equipartition: in the linear regime there are two modes of dynamo action.
|Journal||Symposium - International astronomical union|
|Publication status||Published - 2004|
FingerprintDive into the research topics of 'A magnetic betelgeuse? Numerical simulations of non-linear dynamo action: 219th IAU Symposium on Stars as Suns - Activity, Evolution, and Planets, JUL 21-25, 2003 Sydney, AUSTRALIA'. Together they form a unique fingerprint.
- 1 Talks and presentations in private or public companies
Supernova! Fra Tycho Brahe til Betelgeuse
Bertil F. Dorch (Lecturer)23. Apr 2021 → 29. Apr 2021
Activity: Talks and presentations › Talks and presentations in private or public companies
- 1 Active
MAGSTAR: Research Theme 1: Astrophysical and stellar magnetism
Dorch, B., Nordlund, Å., Freytag, B., Archontis, V., Gudiksen, B. V. & Christensen, M. B. E.
10/04/2002 → …