Galactic ring nebulae associated with Wolf-Rayet stars. V - The stellar wind-blown bubbles

Astronomy and Astrophysics – Astrophysics

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H Alpha Line, Nebulae, Oxygen Spectra, Ring Structures, Stellar Winds, Wolf-Rayet Stars, Bubbles, Fabry-Perot Interferometers, Galactic Structure, Interstellar Matter

Scientific paper

Fabry-Perot observations at H-alpha and O III 5007 forbidden line are presented for the Wolf-Rayet ring nebulae NGC 2359, NGC 6888, and the nebulae around MR 100. The measured expansion velocity of these nebulae are 18, 75, and 50 km/sec, respectively. The kinetic energy of the shells is 1 percent or less of the kinetic energy from the wind over the lifetime of the shell. This energy is more than a factor of 20 less than expected from the theory of stellar wind blown bubbles. The observed dynamics agree better with the momentum-conserving expansion than the adiabatic stage of wind-driven expansion. The origin and role of density inhomogeneities are discussed.

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