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| Paper: |
Wind Acceleration in AGB Stars: Solid Ground and Loose Ends |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
333 |
| Authors: |
Höfner, S. |
| Abstract: |
The winds of cool luminous AGB stars are commonly
assumed to be driven by radiative acceleration of dust grains which
form in the extended atmospheres produced by pulsation-induced shock
waves. The dust particles gain momentum by absorption or scattering
of stellar photons, and they drag along the surrounding gas particles
through collisions, triggering an outflow. This scenario, here referred
to as Pulsation-Enhanced Dust-DRiven Outflow (PEDDRO), has passed a
range of critical observational tests as models have developed from
empirical and qualitative to increasingly self-consistent and
quantitative. A reliable theory of mass loss is an essential piece in
the bigger picture of stellar and galactic chemical evolution, and
central for determining the contribution of AGB stars to the dust
budget of galaxies. In this review, I discuss the current understanding
of wind acceleration and indicate areas where further efforts by
theorists and observers are needed. |
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