Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..823m&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 15, 1983, p. 823-830.
Astronomy and Astrophysics
Astronomy
11
Giant Stars, Magnetic Field Configurations, Solar Magnetic Field, Stellar Coronas, Stellar Magnetic Fields, Stellar Winds, Hertzsprung-Russell Diagram, Magnetohydrodynamic Flow, Plasma Interactions, Stellar Mass Ejection, Stellar Temperature, X Ray Astronomy
Scientific paper
A numerical study of the interaction between a thermal wind and a global dipole field in the sun and in a giant star is reported. In order for closed field lines to persist near the equator (where a helmet-streamer-like configuration appears), the coronal temperature must be less than a critical value Tc, which scales as M/R. This condition is found to be equivalent to the following: for a static helmet streamer to persist, the sonic point above the helmet must not approach closer to the star than 2.2-2.6 stellar radii. Implications for rapid mass loss and X-ray emission from cool giants are pointed out. The results strengthen the case for identifying empirical dividing lines in the H-R diagram with a magnetic topology transition locus (MTTL). Support for the MTTL concept is also provided by considerations of the breakdown of magnetostatic equilibrium.
Mullan Dermott J.
Steinolfson Richard S.
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