Uranium in the spectrum of an old star

The observed spectrum (dots) of the old star HE 1523-0901in the region of the uranium (U II) line at a wavelength of 385.96 nm. The origin of some of the other spectral lines in the region is also indicated (e.g. iron, neodymium, samarium, magnesium). The synthetic spectrum (thin and dotted lines) was computed for the adopted abundances of the stable elements and for four different values of the abundance of uranium atoms in the atmosphere of the star. The uppermost line (corresponding to no uranium at all) clearly does not fit the observed spectrum at all. The best fit is provided by the middle (red) line.

Bildnachweis:

ESO

Über das Bild

ID:eso0723b
Typ:Beobachtung
Veröffentlichungsdatum:10. Mai 2007
Dazugehörige Veröffentlichungen:eso0723
Größe:1184 x 795 px

Über das Objekt

Name:HE 1523-0901
Typ:Milky Way : Star
Entfernung:90 Lichtjahre
Kategorie:Stars

Bildformate

Großes JPEG
138,0 KB

Farben & Filter

SpektralbereichWellenlängeTeleskop
Ultraviolett
UII
385 nmVery Large Telescope
UVES