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Title:
On the generation of mass loss in cool giant stars due to propagating shock waves
Authors:
Cuntz, Manfred
Affiliation:
AA(Joint Institute for Laboratory Astrophysics, Boulder, CO; Heidelberg, Universität, Germany)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 10, 1990, p. 255-264. (ApJ Homepage)
Publication Date:
04/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COOL STARS, GIANT STARS, SHOCK WAVE PROPAGATION, STELLAR MASS, CHROMOSPHERE, STELLAR WINDS, SUPERGIANT STARS
DOI:
10.1086/168612
Bibliographic Code:
1990ApJ...353..255C

Abstract

This paper investigates mass loss in late-type giant stars produced by propagating shock waves, assuming both monochromatic waves and acoustic frequency spectra. In monochromatic wave computations, the wave period is varied by a factor of 50. The wave models show that short-period waves produced in stellar convective zones do not play any direct role in generating the observed mass loss, except for episodic mass-loss events. However, these waves are important for heating stellar chromospheres. Continuous mass-loss solutions are obtained when the wavelengths are comparable to or larger than a stellar radius. In the case of Arcturus, a mass-loss rate between 10 to the -10th and 10 to the -11th solar mass/yr is found, and the final flow speed of the wind is larger than 40 km/s, which are close to the observed values.

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