| Issue |
|
EAS Publications Series
Volume 13,
2004
Evolution of Massive Stars, Mass Loss and Winds
|
|
Page(s)
|
|
317 - 337 |
| DOI |
|
10.1051/eas:2004059 |
|
Evolution of Massive Stars, Mass Loss and Winds
M. Heydari-Malayeri, Ph. Stee and J.-P. Zahn (eds)
EAS Publications Series, 13 (2004) 317-337
DOI: 10.1051/eas:2004059
Mass-loss in central stars of planetary nebulae and in Wolf-Rayet stars
Y. Grosdidier1 and A. Acker2
1
McGill University, Ernest Rutherford Physics Building,
3600 University St., Montréal, Québec, H3A 2T8, Canada,
2
Observatoire astronomique de Strasbourg, UMR 7550,
11 rue de l'Université, 67000 Strasbourg, France,
gyves@physics.mcgill.caacker@newb6.u-strasbg.fr Abstract
In the present paper we review some basic facts regarding the
similarities and differences between Galactic planetary nebulae (PN) and
Galactic Wolf-Rayet (WR) nebulae
within the scope of stellar mass-loss history and its subsequent
impact on the nebular dynamics and morphology.
The case of planetary nebulae with [WR] nucleus, which allows one
to perform a more direct comparison with WR nebulae, is emphasized.
In particular, we review
selected studies on the PN NGC 40 and on the WR nebula M 1-67.
We describe the apparently ubiquitous turbulent-like phenomena
originating in WR/[WR] stellar atmospheres and the surrounding nebulae,
and discuss the possible impact of turbulence on ejected nebula studies.
The properties of turbulence observed in ejected
nebulae (apparently
supersonic) are at odds with the ones related to
Kolmogorov's
subsonic, incompressible
turbulence. The large compressibility of the nebular gases and the possible
multiplicity of turbulence energy sources are likely the main explanations
for that difference. The Universal Multifractal approach of
Lovejoy & Schertzer is presented and constitutes a physically
realistic and natural
way of modeling and
quantifying
nebular turbulence data with only three independent parameters, including
the key
C1 intermittence parameter.
© EAS, EDP Sciences 2004
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