Mass loss mechanisms in evolved stars

Details Mass loss mechanisms in evolved stars Mass loss mechanisms in evolved stars

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26arv...2..249l&link_type=abstract

Astronomy and Astrophysics Review (ISSN 0935-4956), vol. 2, April 1991, p. 249-289.

Astronomy and Astrophysics

Astrophysics

65

Late Stars, Stellar Evolution, Stellar Mass Ejection, Cosmic Dust, Hertzsprung-Russell Diagram, Magnetohydrodynamic Waves, Stellar Atmospheres, Stellar Envelopes, Stellar Winds

Scientific paper

Mass loss is a very important phenomenon for stellar evolution. In the late stages of stars it becomes fairly high (up to 0.0001 solar mass/yr) though with a much decreased expansion velocity (about 30 km/s). It can also be variable, sporadic. Presently, no mechanism nor a combination of mechanisms are known to be able to produce the observed effects. Those most invoked (thermal gas pressure, radiation pressure, acoustic waves, shock waves, and Alfven waves) will be described and criticized, with emphasis on the radiation pressure on dust grains at work at least in the outer part of cool atmospheres. The geometry and the content of expanding atmospheres are also discussed together with the mechanisms that may be important at small scales. Both theory and observations are taken into account.

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