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.

Crédit:

ESO

À propos de l'image

Identification:eso0723b
Type:Observation
Date de publication:10 mai 2007
Communiqués de presse en rapport:eso0723
Taille:1184 x 795 px

À propos de l'objet

Nom:HE 1523-0901
Type:Milky Way : Star
Distance:90 années lumière
Catégorie:Stars

Image Formats

Grand JPEG
138,0 Kio
JPEG taille écran
117,0 Kio

Couleurs & filtres

DomaineLongueur d'ondeTélescope
Ultraviolet
UII
385 nmVery Large Telescope
UVES