Circumstellar shells around luminous emission-line stars in the Large Magellanic Cloud

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Early Stars, Emission Spectra, Magellanic Clouds, Planetary Nebulae, Stellar Envelopes, Supergiant Stars, Forbidden Transitions, Stellar Luminosity, Stellar Mass Ejection, Stellar Spectra, Stellar Winds

Scientific paper

High-resolution echelle spectrograms obtained with CASPEC of seven luminous emission-line stars in the LMC are discussed. The authors find narrow nebular emission lines in all stars of this sample. The emission lines are clearly resolved in all cases. The three S Dor variables R 71, S Dor and R 127 show velocity-doubled [N II] 6548, 6583 lines. The authors consider the presence of the nebular emission lines as evidence for the presence of supergiant planetary nebulae around the central stars. The density of the nebulae exceeds 105cm-3 in several cases. The authors discuss the origin of the expanding shells. It seems most likely that they have been ejected during previous S Dor episodes of the central stars. This implies that a major fraction of the most luminous emission-line stars undergoes S Dor-like outbursts.

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