Causes
A number of factors can contribute to the loss of mass in giant stars, including: *Gravitational attraction of a binary companion * Coronal mass ejection-type events *Ascension to red giant or red supergiant statusSolar wind
The Sun, a low-mass star, loses mass due to the solar wind at a very small rate, solar masses per year.Gravitational mass loss
Often when a star is a member of a pair of close-orbiting binary stars, the tidal attraction of the gasses near the center of mass are sufficient to pull gas from one star onto its partner. This effect is especially prominent when the partner is a white dwarf,Mass ejection
Certain classes of stars, especially Wolf-Rayet stars are sufficiently massive and distended that their hold on their upper layers is rather weak. Often, events such as solar flares and coronal mass ejections will then be sufficiently powerful to blast some of the upper material into space.Red giant mass loss
Stars which have entered the red giant phase are notorious for rapid mass loss. As above, the gravitational hold on the upper layers is weakened, and they may be shed into space by violent events such as the beginning of a helium flash in the core. The final stage of a red giant's life will also result in prodigious mass loss as the star loses its outer layers to form a planetary nebula.See also
* Red giant * Red supergiant *References
{{Reflist *Seeds, Michael A., ''Astronomy: The Solar System and Beyond'', Brooks/Cole 2005External links