A Slitless Spectroscopic Survey for Hα-emitting Stars in the Magellanic Clouds

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Scientific paper

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Scientific paper

The slitless-spectroscopy mode of the Wide Field Imager was used for a comprehensive survey of the Magellanic Clouds to detect stars exhibiting Hα line emission. A total of eight million spectra were recorded. Analysis of 84 open star clusters in the Small Magellanic Cloud confirms that the fraction of extremely rapidly rotating Be stars increases with decreasing metallicity. The very large database also enables other aspects of the complex interplay of early-type stars with stellar evolution, metallicity, mass loss and rapid rotation to be examined.

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