Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-09-21
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
8 pages, 3 figures, to appear in the proceedings of the Asymmetric Planetary Nebulae V (APN V) conference (replaced with minor
Scientific paper
Observational evidence for strong magnetic fields throughout the envelopes of evolved stars is increasing. Many of the instruments coming on line in the near-future will be able to make further contributions to this field. Specifically, maser polarization observations and dust/line polarization in the sub-mm regime has the potential to finally provide a definite picture of the magnetic field strength and configuration from the Asymptotic Giant Branch (AGB) all the way to the Planetary Nebula phase. While current observations are limited in sample size, strong magnetic fields appear ubiquitous at all stages of (post-)AGB evolution. Recent observations also strongly support a field structure that is maintained from close to the star to several thousands of AU distance. While its origin is still unclear, the magnetic field is thus a strong candidate for shaping the stellar outflows on the path to the planetary nebula phase and might even play a role in determining the stellar mass-loss.
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