A Magnetohydrodynamic Model for the AGB Star: Preplanetary Nebula Symbiosis

In this article, a magnetohydrodynamic (MHD) model is presented that is aimed at understanding the anisotropic mass loss by an AGB star and subsequent bipolar planetary nebula formation. The main challenge in developing such a model was to simultaneously treat the dynamo engine in the core region of...

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Veröffentlicht in:	Publications of the Astronomical Society of the Pacific 2010-11, Vol.122 (897), p.1334-1340
Hauptverfasser:	Pascoli, G., Lahoche, L.
Format:	Artikel
Sprache:	eng
Schlagworte:	AM Herculis stars Astronomy Asymptotic giant branch stars Buoyancy Circumstellar envelope Contour lines Earth, ocean, space Equatorial regions Exact sciences and technology Magnetic fields Rotating generators Stars Stellar progenitors
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Beschreibung
Zusammenfassung:	In this article, a magnetohydrodynamic (MHD) model is presented that is aimed at understanding the anisotropic mass loss by an AGB star and subsequent bipolar planetary nebula formation. The main challenge in developing such a model was to simultaneously treat the dynamo engine in the core region of the AGB progenitor, magnetic buoyancy, meridional circulation, and gas ejection in a self-consistent manner. A previous article did not incorporate the dynamo and the feedback of the produced magnetic field on differential rotation.
ISSN:	0004-6280 1538-3873
DOI:	10.1086/657508