The UV spectrum of the Galactic bulge

Busso, Giorgia

The elliptical galaxies show in their spectra at ultraviolet wavelengths an unexpected flux . SdB (alias called Extreme Horizontal Branch) stars are believed to be responsible of this feature. A spectroscopic analysis showed that sdB stars are present also in the bulge of our Galaxy. By means of spectroscopic and photometric data, the Galactic bulge integrated spectrum from the UV to the optical was constructed, showing that the Galactic bulge has only a very small (or not at all) UV excess. A parallel study of Horizontal Branch stars in two Globular clusters hints to more than one star formation episode in these systems.

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Busso, Giorgia: The UV spectrum of the Galactic bulge.

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