Apdo. Postal 3-72, Morelia, Mich. 58089, México
2Inst. Argentino de Radioastronomía
C.C. 5, 1894 Villa Elisa, Argentina
e-mail: m.contreras@astrosmo.unam.mx
Abstract:
The interaction between a stellar wind and its surrounding ISM can
create HI cavities or bubbles. In particular, WR 6 shows a very
large ovoidal HI bubble around it, whose shape cannot be explained in
terms of the standard interstellar bubble theory and may require an
anisotropic wind. We have studied this possibility using 3.6cm VLA
observations. We found no firm evidence supporting that WR 6 has
a strong anisotropic wind. We conclude that our results are consistent
with a classic thermal wind. Under this assumption we have determined
the source size, its brightness temperature and its mass loss rate.
