Local Circumstellar Magnetic Fields Around Evolved Stars

Details Local Circumstellar Magnetic Fields Around Evolved Stars Local Circumstellar Magnetic Fields Around Evolved Stars

2002-04-09

arxiv.org/abs/astro-ph/0204157v1

Mon.Not.Roy.Astron.Soc. 336 (2002) 826

Astronomy and Astrophysics

Astrophysics

Submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05817.x

I argue that the presence of magnetic fields around evolved stars, e.g., asymptotic giant branch stars, and in PNe, does not necessarily imply that the magnetic field plays a global dynamical role in shaping the circumstellar envelope. Instead, I favor magnetic fields with small coherence lengths, which result from stellar magnetic spots or from jets blown by an accreting companion. Although the magnetic field does not play a global role in shaping the circumstellar envelope, it may enhance local motion (turbulent) via magnetic tension and reconnection. The locally strong magnetic tension may enforce coherence flow which may favor the masing process.

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