On the physical processes underlying the existence and origin of X-ray and mass loss 'dividing lines' for cool giants and supergiants

Details On the physical processes underlying the existence and origin of X-ray and mass loss 'dividing lines' for cool giants and supergiants On the physical processes underlying the existence and origin of X-ray and mass loss 'dividing lines' for cool giants and supergiants

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995alab.rept.....m&link_type=abstract

Technical Report, Alabama Univ. Huntsville, AL United States

Computer Science

Numerical Analysis

Magnetohydrodynamic Waves, Supergiant Stars, Giant Stars, Cool Stars, Solar Corona, High Temperature Plasmas, Hertzsprung-Russell Diagram, Astronomical Models, X Rays, X Ray Sources, Stellar Evolution, Stellar Atmospheres, Wave Propagation, Critical Frequencies, Dirac Equation, Stellar Activity, Magnetic Flux, Plasma Heating, Numerical Analysis, Wave Reflection, Mass Transfer

Scientific paper

The necessity of magnetic confinement for hot coronal material and the large reflection efficiency for Alfven waves in cool exponential atmospheres are considered. The joint problem is addressed, namely, how one can account for the coincidence of the relatively sudden onset of large mass loss rates with the equally sudden disappearance of emission associated with high temperature (greater than 106 K) plasma emitting X-rays as one moves along the giant and supergiant branches in the H-R diagram. A model is constructed for the transition from solar-like coronal and transition region behavior to strong, cool mass outflows as evolved stars move across the locus of 'dividing lines' in the H-R diagram. This model favors Alfven waves as a main source of heating the atmospheres to coronal temperatures and as a source of the wind acceleration. Analytical and numerical methods are used to investigate reflection and trapping of linear and nonlinear Alfven waves in highly inhomogeneous and expanding stellar atmospheres.

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