EDP Sciences
Free Access
Volume 394, Number 3, November II 2002
Page(s) 901 - 909
Section Formation, structure and evolution of stars
DOI https://doi.org/10.1051/0004-6361:20021164

A&A 394, 901-909 (2002)
DOI: 10.1051/0004-6361:20021164

Stellar wind bubbles around WR and [WR] stars

G. Mellema1 and P. Lundqvist2

1  Sterrewacht Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands
    e-mail: mellema@strw.leidenuniv.nl
2  Stockholm Observatory, AlbaNova (SCFAB), Department of Astronomy, 106 91 Stockholm, Sweden
    e-mail: peter@astro.su.se

(Received 30 April 2002 / Accepted 7 August 2002 )

We study the dynamics of stellar wind bubbles around hydrogen-deficient stars using numerical simulations with time- and ion dependent cooling. We consider two types of hydrogen-deficient stars, massive WR stars, producing Ring Nebulae, and low mass [WR] stars, producing Planetary Nebulae. We show that for the Planetary Nebulae, the different cooling properties of the hydrogen-deficient wind lead to a later transition from momentum- to energy-driven flow, which could explain the observed turbulence of these nebulae. We find that Ring Nebulae should all be energy-driven, and show how comparing the bubble's momentum and kinetic energy to the input wind momentum and kinetic energy, can give misleading information about the dynamics of the bubble.

Key words: planetary nebulae: general -- ISM: bubbles -- stars: Wolf-Rayet -- stars: AGB and post-AGB -- hydrodynamics

Offprint request: G. Mellema, mellema@strw.leidenuniv.nl

© ESO 2002