Frictional heating of a corona

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Authors	KUBÁT Jiří KRTIČKA Jiří
Year of publication	2004
Type	Article in Proceedings
Conference	Stars as Suns: Activity, Evolution, and Planets, IAU Symposium, Vol. 219, 2004, A. K. Dupree and A. O. Benz, Eds.
MU Faculty or unit	Faculty of Science
Citation
Field	Astronomy and astrophysics
Keywords	Stars: early-type; stars: coronae. hydrodynamics; stars: winds; outflows; stars: emission-line; Be
Description	Multicomponent nature of radiatively driven winds has dramatic effects on winds of cool B type stars. Radiatively driven winds are accelerated by radiation absorbed in spectral lines of metallic ions. Friction between accelerated ions and a passive component (hydrogen or helium) serves as a driving force for the passive component. Friction causes large heating of a wind up to temperatures of the order of million degrees. Consequently, a hot coronal region is formed. Theoretical and observational consequences are discussed.
Related projects:	Physics of hot stars and stellar systems with hot components