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| Paper: |
Dust in AGB Stars: Transparent or Opaque? |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
315 |
| Authors: |
Bladh, S.; Höfner, S.; Aringer, B. |
| Abstract: |
The optical properties of the dust particles that drive the winds
of cool giant stars affect the stellar spectra in two ways:
(1) indirectly, through their influence on the dynamical structure
of the atmosphere/envelope and the resulting molecular features,
and (2) directly, by changes of the spectral energy distribution
due to absorption and scattering on dust grains. The qualitative
differences in the energy distributions of C-type and M-type AGB
stars in the visual and near-infrared regions suggest that the dust
particles in oxygen rich atmospheres are relatively transparent to
radiation. By using detailed dynamical models of gas and radiation
combined with a simple description for the dust opacity (which can
be adjusted to mimic different wavelength dependences and
condensation temperatures) and also by adjusting the fraction of
the opacity that is treated as true absorption, we investigate
which dust properties produce synthetic photometry consistent with
observations. The goal of this study is to narrow down the possible
dust species that may be driving the winds in M-type AGB stars. |
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