A population of faint blue stars in a southern external part of the Large Magellanic Cloud

Astronomy and Astrophysics – Astronomy

Scientific paper

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Blue Stars, Early Stars, Magellanic Clouds, Star Formation, Ultraviolet Astronomy, Astronomical Photometry, Emission Spectra, Faint Objects, Far Ultraviolet Radiation, Main Sequence Stars, Stellar Luminosity

Scientific paper

Far-UV balloon observations of the Large Magellanic Cloud have revealed a thin arc-shaped emission in the very southern end of the Cloud. A rapid inspection of visual photographic plates shows that this brightness enhancement corresponds to a very numerous faint blue population, without very bright O stars or supergiants. The author has determined the parameters of the stellar content of this region, using large-scale UBV photographic photometry. It presents a relatively usual value for the slope of the V luminosity function for the main sequence stars (0.6), within the V magnitude range 14 to 18. The upper mass limit in the region is estimated to be about 25 M_sun;.

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