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.

Credit:

ESO

Over de afbeelding

Id:eso0723b
Type:Observatie
Publicatiedatum:10 mei 2007
Gerelateerde berichten:eso0723
Grootte:1184 x 795 px

Over het object

Naam:HE 1523-0901
Type:Milky Way : Star
Afstand:90 lichtjaren
Categorie:Stars

Afbeeldingstypen

Grote JPEG
138,0 KB

Kleuren & filters

BandGolflengteTelescoop
Ultraviolet
UII
385 nmVery Large Telescope
UVES