Dissertation (Metadaten)
Titel:The UV spectrum of the Galactic bulge
Autor:Giorgia Busso
Fakultät:Mathematisch-Naturwissenschaftliche Fakultät
DDC Sachgebiet:520 Astronomie, Kartographie
Datum der mdl. Prüfung:05.02.2007
Referent(in):Dr. Sabine Moehler
Korreferent(en) Korreferentin:Pr. Giampaolo Piotto
Beschreibung: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.
Schlagworte:Galactic Bulge, UV excess , subdwarf B stars, horizontal branch stars, integrated spectrum
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