A latitude-dependent wind model for Mira's cometary head

Details A latitude-dependent wind model for Mira's cometary head A latitude-dependent wind model for Mira's cometary head

2008-05-05

arxiv.org/abs/0805.0549v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, accepted for publication in ApJL

Scientific paper

10.1086/589651

We present a 3D numerical simulation of the recently discovered cometary structure produced as Mira travels through the galactic ISM. In our simulation, we consider that Mira ejects a steady, latitude-dependent wind, which interacts with a homogeneous, streaming environment. The axisymmetry of the problem is broken by the lack of alignment between the direction of the relative motion of the environment and the polar axis of the latitude-dependent wind. With this model, we are able to produce a cometary head with a ``double bow shock'' which agrees well with the structure of the head of Mira's comet. We therefore conclude that a time-dependence in the ejected wind is not required for reproducing the observed double bow shock.

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