Magnetic confinement, Alfven wave reflection, and the origins of X-ray and mass-loss 'dividing lines' for late-type giants and supergiants

Details Magnetic confinement, Alfven wave reflection, and the origins of X-ray and mass-loss 'dividing lines' for late-type giants and supergiants Magnetic confinement, Alfven wave reflection, and the origins of X-ray and mass-loss 'dividing lines' for late-type giants and supergiants

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372l..91r&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 372, May 10, 1991, p. L91-L94. University of Chicago-supported re

Astronomy and Astrophysics

Astrophysics

48

Electrostatic Waves, Giant Stars, Late Stars, Stellar Mass Ejection, Supergiant Stars, Wave Reflection, Plasma Control, Stellar Coronas, Stellar Winds, X Ray Sources

Scientific paper

A simple qualitative model for the origin of the coronal and mass-loss dividing lines separating late-type giants and supergiants with and without hot, X-ray-emitting corona, and with and without significant mass loss is discussed. The basic physical effects considered are the necessity of magnetic confinement for hot coronal material on the surface of such stars and the large reflection efficiency for Alfven waves in cool exponential atmospheres. The model assumes that the magnetic field geometry of these stars changes across the observed 'dividing lines' from being mostly closed on the high effective temperature side to being mostly open on the low effective temperature side.

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