Optical emission from ring-shaped nebulae in the LMC

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photography, Light Emission, Magellanic Clouds, Nebulae, Bandpass Filters, Bandwidth, Galactic Evolution, H Alpha Line, Velocity Distribution, Wolf-Rayet Stars

Scientific paper

A photographic survey of ring-shaped nebulae in the LMC, performed with narrow band interference filters in H-alpha and forbidden Si II, permits determination of their mean forbidden Si II/H-alpha line-ratios. This information, together with the velocity dispersion obtained from FP interferograms and the knowledge of their stellar content, allow an overall view of these regions and of their probable origin. Some specific nebulae are discussed.

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