The ring nebulae associated with Wolf-Rayet stars - Stellar wind or ejected shells?

Astronomy and Astrophysics – Astronomy

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Nebulae, Stellar Envelopes, Stellar Mass Ejection, Stellar Winds, Wolf-Rayet Stars, H Ii Regions, Ring Structures

Scientific paper

The association of WR stars with surrounding H II regions, including ring nebulae, is analyzed statistically. Among all WR stars, 29 percent (at most 44 percent, if unreliable identifications are accepted) are accompanied by ring structures, or separately by spectral type: 40 percent (at most 60 percent) of early WN stars, 30 percent (at most 50 percent) of late WNs and 17 percent (at most 28 percent) of WCs. These proportions are too low to corroborate the mechanism whereby ring nebulae would originate solely through sweeping up of interstellar gas by the stellar wind. More likely the wind stage is preceded by shell injection. A strong stellar wind in itself need not produce a ring nebula.

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