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| Paper: |
Analytical Models of Spirals in Stellar Winds to Interpret
ALMA Data |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
545 |
| Authors: |
Homan, W.; Decin, L.; de Koter, A.; Van Marle, A.; Lombaert, R.; Vlemmings, W. H. T. |
| Abstract: |
Observations of stellar winds have shown that these outflows are
non-homogeneous and might harbor structural complexities on macro-
and microscales. Here, we focus on spiral structures with the aim
to expand our understanding of the manifestation of such structures
in the (one- and three-dimensional) observables of a stellar wind.
For this we have developed fully parametrised analytical models.
The emission produced by these models is simulated via 3D radiative
transfer. We present the results for two different models of an
optically thin spiral in an optically thin outflow. The two spiral
geometries considered are identical, but for their opening angle,
which are respectively low and high. We demonstrate that the
low-excitation rotational spectral lines of CO hardly reflect this
more complex geometry, but that spatial information, in the form of
Position-Velocity diagrams, does carry all the fundamental geometrical
information. Finally, we briefly present a comparison with the ALMA
data for CW Leo. |
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