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Title:
Momentum and energy deposition in late-type stellar atmospheres and winds
Authors:
Hartmann, L.; MacGregor, K. B.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass; Chicago, University, Chicago, Ill.)
Publication:
Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 260-282. (ApJ Homepage)
Publication Date:
11/1980
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Energy Transfer, Late Stars, Momentum Transfer, Stellar Atmospheres, Stellar Winds, Atmospheric Temperature, Chromosphere, Energy Dissipation, Magnetohydrodynamic Waves, Stellar Mass Ejection
DOI:
10.1086/158461
Bibliographic Code:
1980ApJ...242..260H

Abstract

The present study calculates the response of the outer atmospheres of cool low-gravity stars to the passage of the mechanical energy fluxes of solar magnitude in the form of acoustic waves and Alfven waves. It is shown that Alfven waves are efficient in generating outflow, and can account for the order of magnitude of observed mass loss in late-type luminous stars. However, unless these magnetic waves undergo some dissipation within several stellar radii of the surface, the predicted terminal velocities of the resulting stellar winds are far too high. Alfven wave dissipation should give rise to extended warm chromospheres in low-gravity late-type stars, a prediction which can be observationally tested.

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