Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21820501d&link_type=abstract
American Astronomical Society, AAS Meeting #218, #205.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
All stars lose mass. The amount and character of the wind material affects not only the evolution of the star, but also the conditions for exoplanets immersed in the wind. Additionally, mass loss produces the interstellar material which forms a next generation of stars. Study of nearby stars carries implications for the various stellar populations in the Galaxy. Direct detection of outflows and mass loss, particularly from cool stars presents observational challenges. Spectroscopy from the ultraviolet to the infrared spectral regions reveals signatures of outflowing material. Spectral energy distributions pinpoint the presence of dust. Very young stars, such as the T Tauri objects contain outflows co-existing with accreting material. Luminous stars generally have higher rates of mass loss, and the dependence on metallicity becomes critical. While an empirical description of mass loss is needed for stellar evolution calculations, the driving source for many winds and the mechanisms for momentum and energy deposition in the atmospheres remains unclear. Winds also affect the loss of angular momentum from a star. The Sun can provide clues to many of these issues. We review recent results relating to outflow, winds, and mass loss from young stars, dwarf stars, and luminous stars of differing metallicity, and highlight outstanding problems.
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