A Cosmic Battery

Details A Cosmic Battery A Cosmic Battery

1998-08-20

arxiv.org/abs/astro-ph/9808223v1

Astronomy and Astrophysics

Astrophysics

12 pages Latex, 1 postscript figure, to appear in the Astrophysical Journal

Scientific paper

10.1086/306426

We show that the Poynting-Robertson drag effect in an optically thin advection-dominated accretion flow around active gravitating objects generates strong azimuthal electric currents which give rise to astrophysically significant magnetic fields. Although the mechanism is most effective in accreting compact objects, it seems very promising to also account for the generation of stellar dipolar fields during the late protostellar collapse phase, when the star approaches the main sequence.

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