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Analytical Models of Spirals in Stellar Winds to Interpret ALMA Data

W. Homan ; L. Decin ; A. de Koter ; A. J. van Marle ; R. Lombaert ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium)
Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time, Conference on Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time, Vienna JUL 28-AUG 01, 2014 Vol. 497 (2015), p. 545-551.
[Konferensbidrag, refereegranskat]

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.



Denna post skapades 2016-03-30.
CPL Pubid: 233887

 

Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur