A Cosmic Battery | Zendy

Ioannis Contopoulos | Zendy; Demosthenes Kazanas | Zendy

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A Cosmic Battery

Author(s) -

Ioannis Contopoulos,

Demosthenes Kazanas

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306426

Subject(s) - physics , poynting vector , advection , drag , astrophysics , magnetic field , accretion (finance) , cosmic cancer database , dipole , astronomy , mechanics , thermodynamics , quantum mechanics

We show that the Poynting-Robertson drag effect in an optically thinadvection-dominated accretion flow around active gravitating objects generatesstrong azimuthal electric currents which give rise to astrophysicallysignificant magnetic fields. Although the mechanism is most effective inaccreting compact objects, it seems very promising to also account for thegeneration of stellar dipolar fields during the late protostellar collapsephase, when the star approaches the main sequence.Comment: 12 pages Latex, 1 postscript figure, to appear in the Astrophysical Journa

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